MONSANTO CO
SC 13D/A, 1997-04-02
CHEMICALS & ALLIED PRODUCTS
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<PAGE>   1
 
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 2, 1997
 
================================================================================
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
                                  SCHEDULE 13D
                               (AMENDMENT NO. 5)
       (PURSUANT TO SECTION 13(D) OF THE SECURITIES EXCHANGE ACT OF 1934)
                            ------------------------
                                 CALGENE, INC.
                                (NAME OF ISSUER)
 
                    COMMON STOCK, PAR VALUE $.001 PER SHARE)
                         (TITLE OF CLASS OF SECURITIES)
 
                                  129598 10 8
                     (CUSIP NUMBER OF CLASS OF SECURITIES)
 
                            ------------------------
 
                                MONSANTO COMPANY
                       (NAME OF PERSON FILING STATEMENT)
 
                           R. WILLIAM IDE, III, ESQ.
                                MONSANTO COMPANY
                           800 N. LINDBERGH BOULEVARD
                           ST. LOUIS, MISSOURI 63167
                                 (314)694-1000
  (NAME, ADDRESS AND TELEPHONE NUMBER OF PERSON AUTHORIZED TO RECEIVE NOTICES
           AND COMMUNICATIONS ON BEHALF OF PERSONS FILING STATEMENT)
 
                                   Copies to:
 
                             ERIC S. ROBINSON, ESQ.
                         WACHTELL, LIPTON, ROSEN & KATZ
                              51 WEST 52ND STREET
                            NEW YORK, NEW YORK 10019
                                 (212)403-1000
 
                                 MARCH 31, 1997
            (DATE OF EVENT WHICH REQUIRES FILING OF THIS STATEMENT)
 
                            ------------------------
 
     If the filing person has previously filed a statement on Schedule 13G to
report the acquisition which is the subject of this Schedule 13D, and is filing
this statement because of Rule 13d-1(b)(3) or (4), check the following box:  [ ]
 
================================================================================
<PAGE>   2
 
                                  SCHEDULE 13D
 
<TABLE>
<S>                       <C>                                           <C>
- --------------------------
  CUSIP No. 129598 10 8
- --------------------------
- ------------------------------------------------------------------------------------------------
          NAME OF REPORTING PERSON
    1     S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
          MONSANTO COMPANY: 43-0420020
- ------------------------------------------------------------------------------------------------
          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP             (a)  [ ]
    2                                                                  (b)  [ ]
          N/A
- ------------------------------------------------------------------------------------------------
          SEC USE ONLY
    3
- ------------------------------------------------------------------------------------------------
          SOURCE OF FUNDS
    4
          WC
- ------------------------------------------------------------------------------------------------
          CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
    5     PURSUANT TO ITEMS 2(e) or 2(f)                                                     [ ]
          N/A
- ------------------------------------------------------------------------------------------------
          CITIZENSHIP OR PLACE OF ORGANIZATION
    6
          DELAWARE
- ------------------------------------------------------------------------------------------------
                                           SOLE VOTING POWER
     NUMBER OF                       7
       SHARES                              36,396,114
    BENEFICIALLY                 ---------------------------------------------------------------
      OWNED BY                             SHARED VOTING POWER
        EACH                         8
     REPORTING                             N/A
       PERSON                    ---------------------------------------------------------------
        WITH                               SOLE DISPOSITIVE POWER
                                     9
                                           36,396,114
                                 ---------------------------------------------------------------
                                           SHARED DISPOSITIVE POWER
                                    10
                                           N/A
- ------------------------------------------------------------------------------------------------
          AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
    11    PERSON
          36,396,114
- ------------------------------------------------------------------------------------------------
          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES
    12    CERTAIN SHARES  [ ]
          N/A
- ------------------------------------------------------------------------------------------------
          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (7)
    13
          54.6%
- ------------------------------------------------------------------------------------------------
          TYPE OF REPORTING PERSON
    14
          CO
- ------------------------------------------------------------------------------------------------
</TABLE>
 
                                        2
<PAGE>   3
 
                                  INTRODUCTION
 
     This Amendment No. 5 to Schedule 13D ("Amendment No. 5") amends the
Schedule 13D filed April 10, 1996, and all amendments thereto (the "Schedule
13D"), by Monsanto Company, a Delaware corporation ("Monsanto" or the "Reporting
Person"), relating to the Common Stock, par value $.001 per share (the
"Shares"), of Calgene, Inc., a Delaware corporation (the "Company"). Capitalized
terms used herein and not defined have the same meanings ascribed to them in the
Schedule 13D.
 
ITEM 4.  PURPOSE OF TRANSACTION
 
     Item 4 is hereby amended by adding the following to the end thereof:
 
          On March 31, 1997, Monsanto, Monsanto Acquisition Company, Inc., a
     Delaware corporation and newly formed, wholly owned subsidiary of Monsanto
     ("Purchaser"), and the Company entered into an Agreement and Plan of Merger
     (the "Merger Agreement"), a copy of which is attached hereto as Exhibit 1
     and is incorporated herein by reference. The Merger Agreement provides for
     the commencement of a cash tender offer (which tender offer will be in
     compliance with Section 14(d)(1) of the Securities Exchange Act of 1934, as
     amended, and in compliance with the rules and regulations promulgated
     thereunder) to purchase all outstanding Shares (the "Tender Offer"), at a
     price of $8.00 per Share, net to the seller in cash, as promptly as
     reasonably practicable after the date thereof, but in no event later than
     five business days after the initial public announcement of Purchaser's
     intention to commence the Tender Offer. Purchaser may not, without the
     consent of the Special Committee (as defined in the Merger Agreement) of
     the Board of Directors of the Company, accept for payment Shares tendered
     pursuant to the Tender Offer unless at least a majority of the then issued
     and outstanding Shares, other than Shares owned by Monsanto and Purchaser,
     shall have been validly tendered and not withdrawn. The obligation of
     Purchaser to accept for payment and pay for the Shares tendered pursuant to
     the Tender Offer is subject to certain other conditions that are described
     in the Merger Agreement.
 
          The Merger Agreement provides that, following the purchase of Shares
     by Purchaser in the Tender Offer, upon the terms and subject to the
     conditions thereof, and in accordance with the General Corporation Law of
     the State of Delaware (the "DGCL"). Purchaser shall be merged with and into
     the Company (the "Merger"). As a result of the Merger, the separate
     corporate existence of Purchaser shall cease and the Company shall continue
     as the surviving corporation of the Merger and shall become a wholly owned
     subsidiary of Monsanto. Upon consummation of the Merger, each issued and
     then outstanding Share (other than any Shares held in the treasury of the
     Company, or owned by Purchaser, Monsanto or any direct or indirect wholly
     owned subsidiary of Monsanto or of the Company and any Shares held by
     stockholders who shall not have voted in favor of the Merger or consented
     thereto in writing and who shall have demanded properly in writing
     appraisal for such Shares in accordance with Section 262 of the DGCL) shall
     be cancelled and shall be converted automatically into the right to receive
     the amount paid per Share in the Tender Offer, in cash, without interest.
 
          Also on March 31, 1997, the Company and Monsanto executed an Amendment
     (the "Amendment") to the Restated Stockholders Agreement to permit Monsanto
     to acquire additional Shares pursuant to the Offer and the Merger. A copy
     of the Amendment is attached hereto as Exhibit 2 and is incorporated herein
     by reference.
 
          On April 1, 1997, Monsanto and the Company issued a joint press
     release announcing the execution of the Merger Agreement and Amendment. A
     copy of the press release is filed herewith as Exhibit 3 and is
     incorporated herein by reference.
 
ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
        SECURITIES OF THE ISSUER.
 
     Item 6 is hereby amended by adding the following to the end thereof:
 
          On March 31, 1997, Monsanto, Purchaser and the Company entered into
     the Merger Agreement, a copy of which is attached hereto as Exhibit 1 and
     is incorporated herein by reference. The Merger Agreement provides for the
     commencement of the Tender Offer, at a price of $8.00 per Share, net to the
 
                                        3
<PAGE>   4
 
     seller in cash, as promptly as reasonably practicable after the date
     thereof, but in no event later than five business days after the initial
     public announcement of Purchaser's intention to commence the Tender Offer.
     The obligation of Purchaser to accept for payment and pay for the Shares
     tendered pursuant to the Tender Offer is subject to certain conditions and
     restrictions that are described in the Merger Agreement.
 
          The Merger Agreement provides that, following the purchase of Shares
     by Purchaser in the Tender Offer, upon the terms and subject to the
     conditions thereof, and in accordance with the DGCL, Purchaser shall
     consummate the Merger. As a result of the Merger, the separate corporate
     existence of Purchaser shall cease and the Company shall continue as the
     surviving corporation of the Merger and will become a wholly owned
     subsidiary of Monsanto.
 
          Also on March 31, 1997, the Company and Monsanto executed the
     Amendment to permit Monsanto to acquire additional Shares pursuant to the
     Offer and the Merger. A copy of the Amendment is attached hereto as Exhibit
     2 and is incorporated herein by reference.
 
ITEM 7.  MATERIAL TO BE FILED AS EXHIBITS.
 
Exhibit 1 Agreement and Plan of Merger, by and among Monsanto, the Company and
          Purchaser, dated as of March 31, 1997.
 
Exhibit 2 Amendment to the Amended and Restated Stockholders Agreement, by and
          between Monsanto and the Company, dated as of March 31, 1997.
 
Exhibit 3 Press Release dated April 1, 1997.
 
                                        4
<PAGE>   5
 
                                   SIGNATURE
 
     After reasonable inquiry and to the best of each of the undersigned's
knowledge and belief, the undersigned certify that the information set forth in
this statement is true, complete and correct.
 
                                          MONSANTO COMPANY
 
                                          By:  /s/  R. WILLIAM IDE, III
 
                                          --------------------------------------
                                          Name: R. William Ide, III
                                          Title:  Senior Vice President,
                                              General Counsel and Secretary
 
Dated: April 1, 1997
 
                                        5
<PAGE>   6
 
                                 EXHIBIT INDEX
 
<TABLE>
<CAPTION>
EXHIBIT                                        DESCRIPTION
- -------    ------------------------------------------------------------------------------------
<C>        <S>
 1         Agreement and Plan of Merger, by and among Monsanto, the Company and Purchaser,
           dated as of March 31, 1997.
 2         Amendment to the Amended and Restated Stockholders Agreement, by and between
           Monsanto and the Company, dated as of March 31, 1997.
 3         Press Release dated April 1, 1997.
</TABLE>
 
                                        6

<PAGE>   1
                                                                    EXHIBIT 1

                                                                  EXECUTION COPY

- --------------------------------------------------------------------------------

                          AGREEMENT AND PLAN OF MERGER

                                      among

                                MONSANTO COMPANY,

                       MONSANTO ACQUISITION COMPANY, INC.,

                                       and

                                  CALGENE, INC.



                                 March 31, 1997

- --------------------------------------------------------------------------------

<PAGE>   2

                                TABLE OF CONTENTS



                                                                      Page

                                    ARTICLE I

                                    THE OFFER

         SECTION 1.1.   The Offer..................................    3
         SECTION 1.2.   Company Action.............................    7
         SECTION 1.3.   Stockholder Lists..........................   10


                                   ARTICLE II

                                   THE MERGER

         SECTION 2.1.   The Merger.................................   11
         SECTION 2.2.   Effective Time; Closing....................   11
         SECTION 2.3.   Effect of the Merger.......................   12
         SECTION 2.4.   Conversion of Shares.......................   12
         SECTION 2.5.   Stock Options and Stock Purchase Plan......   14
         SECTION 2.6.   Surrender of Shares; Stock Transfer
                          Books....................................   18


                                   ARTICLE III

                            THE SURVIVING CORPORATION

         SECTION 3.1.   Certificate of Incorporation...............   22
         SECTION 3.2.   Bylaws.....................................   22
         SECTION 3.3.   Directors and Officers.....................   22


                                   ARTICLE IV

                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

         SECTION 4.1.   Organization and Standing..................   23
         SECTION 4.2.   Capitalization.............................   24
         SECTION 4.3.   Authority for Agreement....................   25
         SECTION 4.4.   No Conflict................................   26
         SECTION 4.5.   Required Filings and Consents..............   27
         SECTION 4.6.   Compliance.................................   28
         SECTION 4.7.   Reports and Financial Statements...........   28


                                       -i-
<PAGE>   3

                                                                     Page


         SECTION 4.8.   Offer Documents; Schedule 14D-9; Schedule
                          13-E; Proxy Statement....................   30
         SECTION 4.9.   Absence of Certain Changes or Events.......   31
         SECTION 4.10.  Change of Control Agreements ..............   32
         SECTION 4.11.  Brokers....................................   32


                                    ARTICLE V

              REPRESENTATIONS AND WARRANTIES OF PARENT AND PURCHASER

         SECTION 5.1.   Organization and Standing..................   33
         SECTION 5.2.   Authority for Agreement....................   33
         SECTION 5.3.   No Conflict................................   34
         SECTION 5.4.   Required Filings and Consents..............   35
         SECTION 5.5.   Offer Documents............................   35
         SECTION 5.6.   Brokers....................................   36


                                   ARTICLE VI

                                    COVENANTS

         SECTION 6.1.   Conduct of the Business Pending
                          the Merger...............................   37
         SECTION 6.2.   Access to Information; Confidentiality.....   38
         SECTION 6.3.   Notification of Certain Matters............   39
         SECTION 6.4.   Further Action; Reasonable Best Efforts....   40
         SECTION 6.5.   Stockholders' Meeting......................   40
         SECTION 6.6.   Proxy Statement............................   42
         SECTION 6.7.   Indemnification............................   43
         SECTION 6.8.   Public Announcements.......................   45
         SECTION 6.9.   Redemption of Preferred Stock .............   45
         SECTION 6.10.  Parent Actions.............................   46

                                   ARTICLE VII

                                   CONDITIONS

         SECTION 7.1.   Conditions to the Obligation of
                          Each Party...............................   46


                                      -ii-
<PAGE>   4

                                                                     Page


                                  ARTICLE VIII

                             TERMINATION, AMENDMENT
                                   AND WAIVER

         SECTION 8.1.   Termination................................   48
         SECTION 8.2.   Effect of Termination......................   51
         SECTION 8.3.   Amendments.................................   51
         SECTION 8.4.   Waiver.....................................   52


                                   ARTICLE IX

                               GENERAL PROVISIONS

         SECTION 9.1.   No Third Party Beneficiaries...............   52
         SECTION 9.2.   Entire Agreement...........................   52
         SECTION 9.3.   Succession and Assignment..................   53
         SECTION 9.4.   Counterparts...............................   53
         SECTION 9.5.   Headings...................................   53
         SECTION 9.6.   Governing Law..............................   53
         SECTION 9.7.   Severability...............................   54
         SECTION 9.8.   Specific Performance.......................   54
         SECTION 9.9.   Construction...............................   55
         SECTION 9.10.  Non-Survival of Representations and
                          Warranties...............................   55
         SECTION 9.11.  Certain Definitions........................   55
         SECTION 9.12.  Fees and Expenses..........................   56
         SECTION 9.13.  Notices....................................   56


         ANNEX A  --  Conditions to the Offer


                                      -iii-
<PAGE>   5

                          AGREEMENT AND PLAN OF MERGER


                   AGREEMENT AND PLAN OF MERGER (the "Agreement") dated
         as of March 31, 1997, among Calgene, Inc., a Delaware corpora-
         tion (the "Company"), Monsanto Company, a Delaware corporation
         ("Parent"), and Monsanto Acquisition Company, Inc., a Delaware
         corporation and wholly owned subsidiary of Parent ("Pur-
         chaser").


                              W I T N E S S E T H:


                   WHEREAS, as of the date hereof, Parent owns an ag-
         gregate of 36,396,114 shares (the "Parent Shares") of the com-
         mon stock, par value $.001 per share, of the Company (the
         "Shares"), representing approximately 54.6% of the total number
         of Shares issued and outstanding as of the date hereof;


                   WHEREAS, Parent and the Company are parties to the
         Amended and Restated Stockholders Agreement, dated as of Novem-
         ber 12, 1996 (the "Stockholders Agreement");


                   WHEREAS, Parent has proposed that Parent acquire all
         of the remaining issued and outstanding Shares;


                   WHEREAS, in furtherance of such acquisition, it is
         proposed that Purchaser shall make a cash tender offer (the
         "Offer") in compliance with Section 14(d)(1) of the Securities

<PAGE>   6

         Exchange Act of 1934, as amended (the "Exchange Act"), to ac-
         quire all of the issued and outstanding Shares for $8.00 per
         Share (the "Per Share Amount"), net to the seller in cash, upon
         the terms and subject to the conditions of this Agreement and
         the Offer;


                   WHEREAS, the Special Committee (the "Special Commit-
         tee") of Independent Directors (as defined in the Stockholders
         Agreement) of the Board of Directors of the Company (the "Com-
         pany Board") has unanimously recommended that the Company Board
         approve and authorize the Offer, the Merger (as defined below)
         and this Agreement, which recommendation was based in part on
         the opinion of Montgomery Securities, Inc. ("Montgomery Securi-
         ties"), independent financial advisors to the Special Commit-
         tee, that the consideration to be received by the holders of
         Shares (other than Parent and Purchaser) in the Offer and the
         Merger is fair to such holders from a financial point of view;


                   WHEREAS, the Company Board has approved the Offer and
         resolved to recommend its acceptance by the Company's stock-
         holders;


                   WHEREAS, the respective Boards of Directors of Par-
         ent, Purchaser and the Company have deemed it advisable and in
         the best interests of their respective stockholders to consum-
         mate, and have approved, the merger of Purchaser with and into


                                       -2-
<PAGE>   7

         the Company (the "Merger"), upon the terms and subject to the
         conditions set forth herein;


                   WHEREAS, Parent and the Company (with the unanimous
         approval of the Independent Directors) have agreed to enter
         into an Amendment to the Stockholders Agreement (the "Amend-
         ment") to permit the consummation of the transactions contem-
         plated by this Agreement;


                   NOW, THEREFORE, in consideration of the foregoing and
         the respective representations, warranties, covenants and
         agreements contained in this Agreement, the parties hereto
         agree as follows:


                                    ARTICLE I

                                    THE OFFER


                   SECTION 1.1.  The Offer.  (a)  Provided that this
         Agreement shall not have been terminated in accordance with
         Section 8.1 and none of the events set forth in paragraphs
         (a)-(g) of Annex A hereto shall have occurred or be existing,
         Purchaser shall commence the Offer as promptly as reasonably
         practicable after the date hereof, but in no event later than
         five business days after the initial public announcement of
         Purchaser's intention to commence the Offer.  Purchaser shall
         not, without the consent of the Special Committee, accept for
         payment any Shares tendered pursuant to the Offer unless at


                                       -3-
<PAGE>   8

         least a majority of the then issued and outstanding Shares,
         other than the Parent Shares, shall have been validly tendered
         and not withdrawn prior to the expiration of the Offer (the
         "First Minimum Condition").  In addition to the First Minimum
         Condition, the obligation of Purchaser to accept for payment
         and pay for Shares tendered pursuant to the Offer shall be sub-
         ject (i) to the condition (the "Second Minimum Condition") that
         there shall have been validly tendered and not withdrawn prior
         to the expiration of the Offer at least the number of Shares
         that when added to the Parent Shares shall constitute not less
         than 90% of the then issued and outstanding Shares on a Fully
         Diluted Basis (as defined below) and (ii) to the satisfaction
         of the other conditions set forth in Annex A hereto.  Purchaser
         expressly reserves the right to waive any such condition (ex-
         cept the First Minimum Condition) without the consent of the
         Company, and to make any other changes in the terms and condi-
         tions of the Offer; provided, however, that no change may be
         made which decreases the Per Share Amount, changes the form of
         consideration payable in the Offer, reduces the maximum number
         of Shares to be purchased in the Offer or which imposes condi-
         tions to the Offer in addition to those set forth in Annex A
         hereto.  The initial expiration date of the Offer shall be mid-
         night on the 20th business day following commencement of the
         Offer.  The foregoing notwithstanding, Purchaser may, without
         the consent of the Company, extend the Offer (i) for any period


                                       -4-
<PAGE>   9

         required by any rule, regulation, interpretation or position of
         the Securities and Exchange Commission (the "SEC") or the staff
         thereof applicable to the Offer, (ii) if at the initial expira-
         tion date any of the conditions to the Offer set forth in para-
         graphs (a) - (g) of Annex A have not been satisfied or waived,
         until such time as all of such conditions shall have been sat-
         isfied or waived, and (iii) in the event all of the conditions
         to the Offer set forth in Annex A shall have been satisfied or
         waived, other than the First Minimum Condition or the Second
         Minimum Condition, for a period or periods aggregating not more
         than 20 business days after the later of (A) the initial expi-
         ration date of the Offer and (B) the date on which all of the
         conditions set forth in paragraphs (a) - (g) of Annex A shall
         have been satisfied or waived.  If all of the conditions to the
         Offer set forth in Annex A have been satisfied or waived, other
         than the Second Minimum Condition, then on the later to occur
         of (x) the initial expiration date of the Offer and (y) the
         latest expiration date of the Offer permitted by the preceding
         sentence, Purchaser shall waive the Second Minimum Condition.
         The Per Share Amount shall, subject to applicable withholding
         of taxes, be net to the seller in cash, upon the terms and sub-
         ject to the conditions of the Offer.  Subject to the terms and
         conditions of the Offer (including, without limitation, the
         First Minimum Condition and the Second Minimum Condition), Pur-
         chaser shall pay, as promptly as practicable after expiration


                                       -5-
<PAGE>   10

         of the Offer, for all Shares validly tendered and not with-
         drawn.  "Fully Diluted Basis" shall mean, as of any expiration
         date, the number of Shares that would be outstanding on such
         date assuming the exercise of all Company Purchase Plan Options
         (as defined below) outstanding on such date and of all out-
         standing Company Options (as defined below) (i) that have an
         exercise price per Share of less than the Per Share Amount,
         (ii) that are or will be exercisable in accordance with their
         terms within five business days of such date, and (iii) with
         respect to which a Cash Election (as defined below) shall not
         have been received as of such date.


                   (b)  As soon as reasonably practicable on the date of
         commencement of the Offer, Purchaser shall file with the SEC
         (i) a Tender Offer Statement on Schedule 14D-1 (together with
         all amendments and supplements thereto, the "Schedule 14D-1")
         with respect to the Offer and (ii) a Rule 13e-3 Transaction
         Statement on Schedule 13E-3 (together with all amendments and
         supplements thereto, the "Schedule 13E-3") with respect to the
         Offer, the Merger and the other transactions contemplated
         hereby (collectively, the "Transactions").  The Schedule 14D-1
         and the Schedule 13E-3 shall contain or shall incorporate by
         reference an offer to purchase (the "Offer to Purchase") and
         forms of the related letter of transmittal and any related doc-
         uments (the Schedule 14D-1, the Schedule 13E-3, the Offer to


                                       -6-
<PAGE>   11

         Purchase and such other documents, together with all supple-
         ments and amendments thereto, being referred to herein collec-
         tively as the "Offer Documents").  Parent, Purchaser and the
         Company agree to correct promptly any information provided by
         any of them for use in the Offer Documents which shall have
         become false or misleading, and Parent and Purchaser further
         agree to take all steps necessary to cause the Schedule 14D-1
         and the Schedule 13E-3 as so corrected to be filed with the SEC
         and the other Offer Documents as so corrected to be dissemi-
         nated to holders of Shares, in each case as and to the extent
         required by applicable federal and state securities laws.  Par-
         ent and Purchaser shall give the Company and its counsel rea-
         sonable opportunity to review and comment upon the Offer Docu-
         ments and any amendments thereto prior to the filing thereof
         with the SEC.  Parent and Purchaser shall provide the Company
         and its counsel with a copy of any written comments or tele-
         phonic notification of any verbal comments Parent or Purchaser
         may receive from the SEC or its staff with respect to the Offer
         Documents promptly after the receipt thereof and shall provide
         the Company and its counsel with a copy of any written re-
         sponses and telephonic notification of any verbal responses of
         Parent, Purchaser or their counsel.


                   SECTION 1.2.  Company Action.  (a)  The Company here-
         by approves and consents to the Offer and represents that (i)


                                       -7-
<PAGE>   12

         the Special Committee has approved and recommended this Agree-
         ment and the Transactions, (ii) the Company Board, at a meeting
         duly called and held, has, by unanimous vote of all directors
         present and voting (with all directors who are designees of
         Parent abstaining) and based on the approval and recommendation
         of the Special Committee set forth in the preceding clause (i),
         (A) determined that this Agreement and the Transactions, in-
         cluding each of the Offer and the Merger, are fair to and in
         the best interests of the holders of Shares (other than Parent
         and Purchaser), (B) approved and authorized this Agreement and
         the Merger and (C) recommended that the stockholders of the
         Company accept the Offer and, if approval is required by ap-
         plicable law, approve and adopt this Agreement and the Merger,
         and (iii) Montgomery Securities has delivered to the Special
         Committee and to the Company Board its written opinion that the
         consideration to be received by the holders of Shares (other
         than Parent and Purchaser) in the Offer and the Merger is fair
         to such holders from a financial point of view.


                   (b)  The Company shall provide for inclusion in the
         Offer Documents any information reasonably requested by Parent
         or Purchaser, and, to the extent reasonably requested by Parent
         or Purchaser, the Company shall cooperate in the preparation of


                                       -8-
<PAGE>   13

         the Offer Documents.  The Company hereby consents to the inclu-
         sion in the Offer Documents of the recommendation of the Com-
         pany Board and the recommendation of the Special Committee de-
         scribed in the immediately preceding sentence and represents
         that Montgomery Securities has consented to the inclusion of
         references to its opinion in the Offer Documents.


                   (c)  As soon as reasonably practicable on the date of
         commencement of the Offer, the Company shall file with the SEC
         a Solicitation/Recommendation Statement on Schedule 14D-9 (to-
         gether with all amendments and supplements thereto, the "Sched-
         ule 14D-9") containing the recommendation of the Company Board
         described in Section 1.2(a) and shall disseminate the Schedule
         14D-9 to the extent required by Rule 14d-9 promulgated under
         the Exchange Act and any other applicable federal or state se-
         curities laws.  The Company, Parent and Purchaser agree to cor-
         rect promptly any information provided by any of them for use
         in the Schedule 14D-9 which shall have become false or mis-
         leading, and the Company further agrees to take all steps nec-
         essary to cause the Schedule 14D-9 as so corrected to be filed
         with the SEC and disseminated to holders of Shares, in each
         case as and to the extent required by applicable federal or
         state securities laws.  The Company shall give Parent and Pur-
         chaser and their counsel reasonable opportunity to review and
         comment upon the Schedule 14D-9 and any amendments thereto
         prior to the filing thereof with the SEC.  The Company shall


                                       -9-
<PAGE>   14

         provide Parent and Purchaser and their counsel with a copy of
         any written comments or telephonic notification of any verbal
         comments the Company may receive from the SEC or its staff with
         respect to the Schedule 14D-9 promptly after the receipt
         thereof and shall provide Parent and Purchaser and their coun-
         sel with a copy of any written responses and telephonic notifi-
         cation of any verbal responses of the Company or its counsel.

                   SECTION 1.3.  Stockholder Lists.  The Company shall
         promptly, or shall cause its transfer agent to promptly, fur-
         nish Parent and Purchaser with mailing labels containing the
         names and addresses of all record holders of Shares and with
         security position listings of Shares held in stock deposito-
         ries, each as of the most recent practicable date, together
         with all other available listings and computer files containing
         names, addresses and security position listings of record hold-
         ers and beneficial owners of Shares.  The Company shall furnish
         Parent and Purchaser with such additional information, includ-
         ing, without limitation, updated listings and computer files of
         stockholders, mailing labels and security position listings,
         and such other assistance as Parent, Purchaser or their agents
         may reasonably request.  Subject to the requirements of appli-
         cable law, and except for such steps as are necessary to dis-
         seminate the Offer Documents and any other documents necessary
         to consummate the Offer or the Merger, Parent and Purchaser


                                       -10-
<PAGE>   15

         shall hold in confidence the information contained in such la-
         bels, listings and files, shall use such information only in
         connection with the Offer and the Merger, and, if this Agree-
         ment shall be terminated in accordance with Section 8.1, shall
         deliver to the Company all copies of such information then in
         their possession.

                                   ARTICLE II

                                   THE MERGER

                   SECTION 2.1.  The Merger.  Upon the terms and subject
         to the conditions set forth in this Agreement, and in accor-
         dance with the General Corporation Law of the State of Delaware
         ("Delaware Law"), at the Effective Time (as defined below) Pur-
         chaser shall be merged with and into the Company.  As a result
         of the Merger, the separate corporate existence of Purchaser
         shall cease and the Company shall continue as the surviving
         corporation of the Merger.  In its capacity as the surviving
         corporation of the Merger, the Company is sometimes referred to
         herein as the "Surviving Corporation."

                   SECTION 2.2.  Effective Time; Closing.  As promptly
         as practicable after the satisfaction or, if permissible, waiv-
         er of the conditions set forth in Article VII, the parties
         hereto shall cause the Merger to be consummated by filing a
         certificate of merger (the "Certificate of Merger") with the
         Secretary of State of the State of Delaware, in such form as is


                                       -11-
<PAGE>   16

         required by, and executed in accordance with the relevant pro-
         visions of, Delaware Law.  The Merger shall become effective at
         such time as the Certificate of Merger is duly filed with the
         Secretary of State of the State of Delaware, or at such other
         time as the parties hereto agree shall be specified in the Cer-
         tificate of Merger (the date and time the Merger becomes effec-
         tive, the "Effective Time").  On the date of such filing, a
         closing shall be held at the offices of Wachtell, Lipton, Rosen
         & Katz, 51 West 52nd Street, New York, New York, or such other
         place as the parties shall agree.

                   SECTION 2.3.  Effect of the Merger.  At the Effective
         Time, the effect of the Merger shall be as provided in the ap-
         plicable provisions of Delaware Law.

                   SECTION 2.4.  Conversion of Shares.  At the Effective
         Time:


                   (a)  each Share held by the Company as treasury stock
              or owned by Parent, Purchaser or any subsidiary of either
              of them immediately prior to the Effective Time shall be
              cancelled, and no payment shall be made with respect
              thereto;


                   (b)  each Share outstanding immediately prior to the
              Effective Time shall, except as otherwise provided in
              paragraph (a) or paragraph (d) of this Section 2.4, be


                                       -12-
<PAGE>   17

              converted into the right to receive in cash, without in-
              terest, the amount paid per Share in the Offer (the
              "Merger Consideration");


                   (c)  each share of common stock of Purchaser out-
              standing immediately prior to the Effective Time shall be
              converted into and become one share of common stock of the
              Surviving Corporation and shall constitute the only out-
              standing shares of capital stock of the Surviving Corpora-
              tion; and


                   (d)  anything in this Agreement to the contrary not-
              withstanding, any issued and outstanding Shares held by a
              person (a "Dissenting Stockholder") who objects to the
              Merger and complies with all the provisions of Delaware
              Law concerning the right of holders of Shares to dissent
              from the Merger and require appraisal of their Shares
              ("Dissenting Shares") shall not be converted as described
              in Section 2.4(b) but shall become, by virtue of the
              Merger, the right to receive such consideration as may be
              determined to be due to such Dissenting Stockholder pur-
              suant to Delaware Law.  If, after the Effective Time, such
              Dissenting Stockholder withdraws his demand for appraisal
              or fails to perfect or otherwise loses his right of ap-
              praisal, in any case pursuant to Delaware Law, such Shares
              shall be deemed to have been converted as of the Effective


                                       -13-
<PAGE>   18

              Time into the right to receive the Merger Consideration.
              The Company shall give Parent (i) prompt notice of any
              demands for appraisal of Shares received by the Company
              and (ii) the opportunity to participate in and direct all
              negotiations and proceedings with respect to any such de-
              mands.  The Company shall not, without the prior written
              consent of Parent, make any payment with respect to, or
              settle, offer to settle or otherwise negotiate, any such
              demands.

                   SECTION 2.5.  Stock Options and Stock Purchase Plan.
         (a)  At the Effective Time, each holder of an option to pur-
         chase Shares issued pursuant to the Company's 1981 Stock Option
         Plan, 1991 Stock Option Plan or 1996 Stock Option Plan (each
         such plan, a "Company Stock Option Plan" and each option issued
         thereunder, a "Company Option") shall become entitled to re-
         ceive (subject to any required tax withholding) from the Sur-
         viving Corporation, for each Company Option held by such holder
         as of the Effective Time, an amount in cash equal to the prod-
         uct of (i) the excess, if any, of the Merger Consideration over
         the applicable exercise price of such Company Option (deter-
         mined on a Share by Share basis) and (ii) the number of Shares
         subject to such Company Option (without regard to exercisabil-
         ity) immediately prior to the Effective Time (such amount with
         respect to any Company Option, the "Option Consideration"), and
         thereafter each Company Option shall be cancelled; provided,


                                       -14-
<PAGE>   19

         however, that any holder of Company Options may elect not to
         receive the Option Consideration, and, in lieu thereof, to have
         the Company Options held by such holder assumed by the Surviv-
         ing Corporation pursuant to the terms of the Company Stock Op-
         tion Plan pursuant to which such Company Option was issued
         (each, an "Assumed Option").  After the Effective Time, each
         Assumed Option shall no longer confer the right to purchase
         Shares, but shall (i) confer the right to receive from the Sur-
         viving Corporation, for each Share subject to such Company Op-
         tion immediately prior to the Effective Time, and upon payment
         of the applicable exercise price per share in effect with re-
         spect to such Company Option, the Merger Consideration, in
         cash, and (ii) shall otherwise remain subject to all the terms
         and conditions (including with respect to the exercisability
         thereof) applicable to such Company Option pursuant to the op-
         tion agreement related to such Company Option and to the Com-
         pany Stock Option Plan pursuant to which such Company Option
         was issued.


                   (b)  Promptly after the date hereof, the Company
         shall cause to be mailed to each holder of Company Options (i)
         any notification with respect to the effect of the Offer and
         Merger on such Company Options as may be required by any Com-
         pany Stock Option Plan and (ii) a form of election (an "Elec-
         tion Form") which shall indicate that such holder may elect
         either (A) to have such holder's Company Options cancelled in


                                       -15-
<PAGE>   20

         the Merger and to receive the Option Consideration in consider-
         ation therefor, or (B) to have such holder's Company Options
         remain outstanding after the Merger as Assumed Options.  Such
         Election Form shall indicate (x) that any election indicated
         thereon shall be contingent upon the occurrence of the Effec-
         tive Time, (y) that if such holder elects to receive the Option
         Consideration (a "Cash Election") in respect of such holder's
         Company Options and the Effective Time occurs, such holder's
         Cash Election shall constitute such holder's (1) consent to and
         acknowledgment of the cancellation of such holder's Company Op-
         tions as of the Effective Time and (2) release of the Surviving
         Corporation from any and all liability or obligation in connec-
         tion with each of such holder's Company Options, and (z) agree-
         ment not to exercise such Company Options prior to the earlier
         of the Effective Time or the termination of this Agreement.  No
         interest shall accrue or be paid to the beneficial owner or
         holder of any Company Option with respect to the Option Consid-
         eration payable upon the cancellation of any Company Option.

                   (c)  No further Company Options shall be granted pur-
         suant to any Company Stock Option Plan after the Effective
         Time; however, each Company Stock Option Plan shall continue to
         govern any Assumed Option originally issued pursuant to such
         Company Stock Option Plan.


                                       -16-
<PAGE>   21

                   (d)  In the event the current Offering Period (as
         such term is defined in the Company's Employee Stock Purchase
         Plan established March 1990 (the "Company Stock Purchase
         Plan")) ends prior to the Effective Time, the Company shall
         take all such action as may be necessary in accordance with the
         Company Stock Purchase Plan to terminate the Company Stock Pur-
         chase Plan as of the last day of such Offering Period, with the
         effect, among other things, that no new Offering Period shall
         commence thereafter.  In the event the current Offering Period
         under the Company Stock Purchase Plan would not otherwise end
         prior to the Effective Time, then prior to the date that is
         five days prior to the Effective Time, the Company shall amend
         the Company Stock Purchase Plan such that the date on which the
         Effective Time occurs shall be the "Exercise Date" for purposes
         of the Company Stock Purchase Plan with respect to the current
         Offering Period, with the effect that on such Exercise Date,
         prior to the Effective Time, each option to purchase Shares
         issued pursuant to the Company Stock Purchase Plan (each, a
         "Company Purchase Plan Option") shall automatically be exer-
         cised, and the Shares purchased upon such exercise shall there-
         after be converted in the Merger, as provided for in Section
         2.4(b).  At the Effective Time, the Company shall terminate the
         Company Stock Purchase Plan, and no Offering Period that would
         otherwise commence or after on such date shall commence.


                                       -17-
<PAGE>   22

                   SECTION 2.6.  Surrender of Shares; Stock Transfer
         Books.  (a)  Prior to the Effective Time, Parent shall desig-
         nate a bank or trust company to act as agent (the "Paying
         Agent") for the holders of Shares in connection with the Merger
         to receive the funds to which holders of Shares (including
         former holders of Company Purchase Plan Options who become
         holders of Shares immediately prior to the Effective Time pur-
         suant to Section 2.5(d)) shall become entitled pursuant to Sec-
         tion 2.4(b).  Purchaser will make available to the Paying
         Agent, as needed, the Merger Consideration to be paid in re-
         spect of the Shares (the "Fund").  The Fund shall be invested
         by the Paying Agent as directed by Parent.  The Paying Agent
         shall make the payments provided in Sections 2.4(b).

                   (b)  Promptly after the Effective Time, the Surviving
         Corporation shall cause to be mailed to each person who was, at
         the Effective Time, a holder of record of Shares entitled to
         receive the Merger Consideration pursuant to Section 2.4(b) a
         form of letter of transmittal (which shall specify that de-
         livery shall be effected, and risk of loss and title to the
         certificates evidencing such Shares (the "Share Certificates")
         shall pass, only upon proper delivery of the Share Certificates
         to the Paying Agent) and instructions for use in effecting the
         surrender of the Share Certificates pursuant to such letter of
         transmittal.  Upon surrender to the Paying Agent of a Share
         Certificate, together with such letter of transmittal, duly


                                       -18-
<PAGE>   23

         completed and validly executed in accordance with the instruc-
         tions thereto, and such other documents as may be required pur-
         suant to such instructions, the holder of such Share Certifi-
         cate shall be entitled to receive in exchange therefor the
         Merger Consideration for each Share formerly evidenced by such
         Share Certificate, and such Share Certificate shall then be
         cancelled.  Until so surrendered, each such Share Certificate
         shall, at and after the Effective Time, represent for all pur-
         poses, only the right to receive such Merger Consideration.  No
         interest shall accrue or be paid to any beneficial owner of
         Shares or any holder of any Share Certificate with respect to
         the Merger Consideration payable upon the surrender of any
         Share Certificate.  If payment of the Merger Consideration is
         to be made to a person other than the person in whose name the
         surrendered Share Certificate is registered on the stock trans-
         fer books of the Company, it shall be a condition of payment
         that the Share Certificate so surrendered shall be endorsed in
         blank or to the Paying Agent or otherwise be in proper form for
         transfer and that the person requesting such payment shall have
         paid all transfer and other taxes required by reason of the
         payment of the Merger Consideration to a person other than the
         registered holder of the Share Certificate surrendered or shall
         have established to the satisfaction of the Surviving Corpora-
         tion that such taxes either have been paid or are not applica-
         ble.


                                       -19-
<PAGE>   24

                   (c)  At any time following the sixth month after the
         Effective Time, the Surviving Corporation shall be entitled to
         require the Paying Agent to deliver to it any portion of the
         Fund which had been made available to the Paying Agent and not
         disbursed to holders of Shares (including, without limitation,
         all interest and other income received by the Paying Agent in
         respect of all amounts held in the Fund or other funds made
         available to it), and thereafter each such holder shall be en-
         titled to look only to the Surviving Corporation (subject to
         abandoned property, escheat and other similar laws), and only
         as general creditors thereof, with respect to any Merger Con-
         sideration that may be payable upon due surrender of the Share
         Certificates held by such holder.  The foregoing notwithstand-
         ing, neither the Surviving Corporation nor the Paying Agent
         shall be liable to any holder of a Share for any Merger Consid-
         eration delivered in respect of such Share to a public official
         pursuant to any abandoned property, escheat or other similar
         law.

                   (d)  After the Effective Time, the stock transfer
         books of the Company shall be closed and thereafter there shall
         be no further registration of transfers of Shares on the rec-
         ords of the Company.  From and after the Effective Time, the
         holders of Shares outstanding immediately prior to the Effec-
         tive Time shall cease to have any rights with respect to such


                                       -20-
<PAGE>   25

         Shares except as otherwise provided herein or by applicable
         law.

                   (e)  Promptly after the Effective Time, the Surviving
         Corporation shall cause to be mailed to each holder of Company
         Options from whom a Cash Election has been received a check
         payable to such holder in an amount equal to the Option Consid-
         eration payable with respect to all Company Options held by
         such holder with respect to which a Cash Election has been
         made.

                   (f)  Purchaser, the Surviving Corporation and the
         Paying Agent, as the case may be, shall be entitled to deduct
         and withhold from the consideration otherwise payable pursuant
         to this Agreement to any holder of Shares and/or Company Op-
         tions such amounts that Purchaser, the Surviving Corporation or
         the Paying Agent is required to deduct and withhold with re-
         spect to the making of such payment under the Internal Revenue
         Code of 1986, as amended (the "Code"), the rules and regula-
         tions promulgated thereunder or any provision of state, local
         or foreign tax law.  To the extent that amounts are so withheld
         by Purchaser, the Surviving Corporation or the Paying Agent,
         such amounts shall be treated for all purposes of this Agree-
         ment as having been paid to the holder of the Shares and/or


                                       -21-
<PAGE>   26

         Company Options in respect of which such deduction and with-
         holding was made by Purchaser, the Surviving Corporation or the
         Paying Agent.

                                   ARTICLE III

                            THE SURVIVING CORPORATION

                   SECTION 3.1.  Certificate of Incorporation.  At the
         Effective Time and subject to the terms of Section 6.7, the
         certificate of incorporation of Purchaser shall be the certifi-
         cate of incorporation of the Surviving Corporation until there-
         after amended in accordance with Delaware Law, such certificate
         of incorporation and the bylaws of the Surviving Corporation;
         provided, however, that, at the Effective Time, Article I of
         the certificate of incorporation of the Surviving Corporation
         shall be amended to read as follows:  "The name of the corpora-
         tion is Calgene, Inc."

                   SECTION 3.2.  Bylaws.  Subject to the terms of Sec-
         tion 6.7, the bylaws of Purchaser in effect at the Effective
         Time shall be the bylaws of the Surviving Corporation until
         amended in accordance with Delaware Law, and the certificate of
         incorporation and such bylaws of the Surviving Corporation.

                   SECTION 3.3.  Directors and Officers.  From and after
         the Effective Time, until successors are duly elected or ap-
         pointed and qualified in accordance with applicable law, (i)


                                       -22-
<PAGE>   27

         the directors of Purchaser at the Effective Time shall be the
         directors of the Surviving Corporation, and (ii) the officers
         of the Company at the Effective Time shall continue as the of-
         ficers of the Surviving Corporation, in each case until their
         respective successors are duly elected or appointed and quali-
         fied.

                                   ARTICLE IV

                  REPRESENTATIONS AND WARRANTIES OF THE COMPANY

                   The Company represents and warrants to Parent and
         Purchaser as follows:

                   SECTION 4.1.  Organization and Standing.  The Company
         is a corporation duly organized, validly existing and in good
         standing under the laws of the State of Delaware and has full
         corporate power and authority to conduct its business as pres-
         ently conducted and to enter into and perform the Amendment and
         this Agreement and to carry out the Transactions.  The Company
         is duly qualified to do business as a foreign corporation and
         is in good standing in the State of California and in every
         other jurisdiction in which the failure to so qualify would
         have a Material Adverse Effect (as defined below) on the Com-
         pany.  The Company has furnished to Parent true and complete
         copies of its certificate of incorporation (the "Company Cer-
         tificate of Incorporation") and bylaws (the "Company Bylaws"),
         each as amended to date and presently in effect.  "Material


                                       -23-
<PAGE>   28

         Adverse Effect" shall mean, with respect to any party hereto,
         any change, event or effect that, when taken together with all
         other adverse changes, events or effects, is or is reasonably
         likely to be materially adverse to the business, operations,
         properties, condition (financial or otherwise), assets, or li-
         abilities (including, without limitation, contingent liabili-
         ties) of such party and its subsidiaries, taken as a whole.

                   SECTION 4.2.  Capitalization.  The authorized capital
         stock of the Company consists of 100,000,000 Shares and
         10,000,000 shares of preferred stock, $.001 par value per share
         (the "Preferred Shares").  As of March 17, 1997, (i) 66,737,327
         Shares are issued and outstanding, all of which are validly
         issued, fully paid and nonassessable, (ii) no Shares are held
         in the treasury of the Company, (iii) 4,855,755 Shares are au-
         thorized and reserved for future issuance pursuant to Company
         Options issued under the Company Stock Option Plans, (v) ap-
         proximately 21,230 Shares are authorized and reserved for fu-
         ture issuance pursuant to Company Purchase Plan Options issued
         under the Company Stock Purchase Plan, and (v) 1,000 Preferred
         Shares, designated as Series A Redeemable, Non-Voting Preferred
         Stock, par value $.001 per share ("Series A Preferred Shares"),
         are issued and outstanding.  The Company has previously fur-
         nished to Parent a detailed schedule of outstanding Company
         Options and Company Purchase Plan Options, including, where


                                       -24-
<PAGE>   29

         available, the exercise prices and existing provisions there-
         fore.  Except as provided in this Section 4.2 and Section 6.9,
         and except for any rights of Parent pursuant to prior agree-
         ments between Parent and the Company, (A) no subscription, war-
         rant, option, convertible security or other right (contingent
         or otherwise) to purchase or acquire any shares of capital
         stock of the Company is authorized or outstanding, (B) the Com-
         pany has no obligation (contingent or otherwise) to issue any
         subscription, warrant, option, convertible security or other
         such right or to issue or distribute to holders of any shares
         of its capital stock any evidence of indebtedness or assets of
         the Company, and (C) the Company has no obligation (contingent
         or otherwise) to purchase, redeem or otherwise acquire any
         shares of its capital stock or any interest therein or to pay
         any dividend or make any other distribution in respect thereof.

                   SECTION 4.3.  Authority for Agreement.  The execu-
         tion, delivery and performance by the Company of this Agreement
         and the Amendment, and the consummation by the Company of the
         Transactions, has been duly authorized by all necessary corpo-
         rate action (including without limitation the unanimous ap-
         proval of the Independent Directors), other than the approval
         of stockholders of the Company to the extent required by ap-
         plicable law.  This Agreement has been duly executed and deliv-
         ered by the Company and, assuming the due authorization, execu-
         tion and delivery by Parent and Purchaser, constitutes a legal,


                                       -25-
<PAGE>   30

         valid and binding obligation of the Company enforceable against
         the Company in accordance with its terms.  In the event the
         Merger is consummated pursuant to a provision of Delaware Law
         other than Section 253 of Delaware Law, the affirmative vote of
         holders of a majority of the outstanding Shares entitled to
         vote at a duly called and held meeting of stockholders is the
         only vote of the Company's stockholders necessary to approve
         this Agreement and the Transactions.

                   SECTION 4.4.  No Conflict.  The execution and deliv-
         ery of the Amendment and this Agreement by the Company do not,
         and the performance of the Amendment and this Agreement by the
         Company and the consummation of the Transactions will not, (i)
         conflict with or violate the Company Certificate of Incorpora-
         tion or Company Bylaws or equivalent organizational documents
         of any of its subsidiaries, (ii) conflict with or violate any
         law, rule, regulation, order, judgment or decree applicable to
         the Company or any of its subsidiaries or by which any property
         or asset of the Company or any of its subsidiaries is bound or
         affected, or (iii) result in any breach of or constitute a de-
         fault (or an event which with notice or lapse of time or both
         would become a default) under, or give to others any right of
         termination, amendment, acceleration or cancellation of, or
         result in the creation of a lien or other encumbrance on any
         property or asset of the Company or any of its subsidiaries
         pursuant to, any note, bond, mortgage, indenture, contract,


                                       -26-
<PAGE>   31

         agreement, lease, license, permit, franchise or other instru-
         ment or obligation to which the Company or any of its subsid-
         iaries is a party or by which the Company or any of its subsid-
         iaries or any property or asset of any of them is bound or af-
         fected, except in the case of clauses (ii) and (iii) for any
         such conflicts, violations, breaches, defaults or other occur-
         rences which would not, individually or in the aggregate, have
         a Material Adverse Effect on the Company, or prevent or materi-
         ally delay the performance by the Company of any of its obliga-
         tions under this Agreement or the consummation of the Transac-
         tions.

                   SECTION 4.5.  Required Filings and Consents.  The
         execution and delivery of the Amendment and this Agreement by
         the Company do not, and the performance of the Amendment and
         this Agreement by the Company will not, require any consent,
         approval, authorization or permit of, or filing with or notifi-
         cation to, any governmental or regulatory authority, domestic
         or foreign, except (i) for applicable requirements, if any, of
         the Exchange Act, state securities or "blue sky" laws ("Blue
         Sky Laws") and filing and recordation of appropriate merger
         documents as required by Delaware Law and (ii) where failure to
         obtain such consents, approvals, authorizations or permits, or
         to make such filings or notifications, would not, individually
         or in the aggregate, have a Material Adverse Effect on the Com-
         pany, or prevent or materially delay the performance by the


                                       -27-
<PAGE>   32

         Company of any of its obligations under this Agreement or the
         consummation of the Transactions.

                   SECTION 4.6.  Compliance.  Neither the Company nor
         any of its subsidiaries is in conflict with, or in default or
         violation of, (i) any law, rule, regulation, order, judgment or
         decree applicable to the Company or any of its subsidiaries or
         by which any property or asset of the Company or any of its
         subsidiaries is bound or affected, or (ii) any note, bond,
         mortgage, indenture, contract, agreement, lease, license, per-
         mit, franchise or other instrument or obligation to which the
         Company or any of its subsidiaries is a party or by which the
         Company or any of its subsidiaries or any property or asset of
         the Company or any of its subsidiaries is bound or affected,
         except for any such conflicts, defaults or violations that
         would not, individually or in the aggregate, have a Material
         Adverse Effect on the Company, or prevent or materially delay
         the performance by the Company of any of its obligations under
         this Agreement or the consummation of the Transactions.

                   SECTION 4.7.  Reports and Financial Statements.  The
         Company has previously furnished to Parent complete and accu-
         rate copies, as amended or supplemented, of its (i) Transi-
         tional Report on Form 10-K for the transitional period from
         July 1, 1996 to December 31, 1996, (ii) proxy statements
         relating to all meetings of its stockholders (whether annual or


                                       -28-
<PAGE>   33

         special) since June 30, 1996 and (iii) all other reports or
         registration statements, including Registration Statements on
         Form S-8, filed by the Company with the SEC since June 30, 1996
         (such annual reports, proxy statements, registration statements
         and other filings, together with any amendments or supplements
         thereto, are collectively referred to herein as the "Company
         Reports").  The Company Reports constitute all of the documents
         filed or required to be filed by the Company with the SEC since
         June 30, 1996.  As of their respective dates, the Company
         Reports did not contain any untrue statement of a material fact
         or omit to state a material fact required to be stated therein
         or necessary to make the statements therein, in light of the
         circumstances under which they were made, not misleading.  The
         audited financial statements and unaudited interim financial
         statements of the Company included in the Company Reports (to-
         gether, the "Financial Statements") (A) comply as to form in
         all material respects with applicable accounting requirements
         and the published rules and regulations of the SEC with respect
         thereto, (B) have been prepared in accordance with United
         States generally accepted accounting principles ("GAAP") ap-
         plied on a consistent basis throughout the periods covered
         thereby (except as may be indicated therein or in the notes
         thereto, and in the case of quarterly financial statements, as
         permitted by Form 10-Q under the Exchange Act), and (C) fairly
         present in all material respects the consolidated financial


                                       -29-
<PAGE>   34

         condition, results of operations and cash flows of the Company
         and its consolidated subsidiaries as of the respective dates
         thereof and for the periods referred to therein.

                   SECTION 4.8.  Offer Documents; Schedule 14D-9; Sched-
         ule 13-E; Proxy Statement.  Neither the Schedule 14D-9 nor any
         information supplied by the Company for inclusion in the Offer
         Documents shall, at the respective times the Schedule 14D-9,
         the Offer Documents or any amendments or supplements thereto
         are filed with the SEC or are first published, sent or given to
         stockholders of the Company, as the case may be, contain any
         untrue statement of a material fact or omit to state any mate-
         rial fact required to be stated therein or necessary in order
         to make the statements made therein, in the light of the cir-
         cumstances under which they are made, not misleading.  If a
         Stockholders' Meeting (as defined below) is held, the Proxy
         Statement (as defined below) to be sent to the stockholders of
         the Company in connection with the such Stockholders' Meeting
         shall not, on the date such Proxy Statement (or any amendment
         or supplement thereto) is first mailed to stockholders of the
         Company and at the time of the Stockholders' Meeting, contain
         an untrue statement of material fact, or omit to state any ma-
         terial fact required to be stated therein or necessary in order
         to make the statements made therein, in the light of the cir-
         cumstances under which they are made, not misleading or nec-
         essary to correct any statement in any earlier communication


                                       -30-
<PAGE>   35

         with respect to the solicitation of proxies for the Stockhold-
         ers' Meeting which shall have become false or misleading.  The
         foregoing notwithstanding, the Company makes no representation
         or warranty with respect to any information supplied by Parent,
         Purchaser or any of their representatives which is contained in
         any of the foregoing documents.  The Schedule 14D-9 and the
         Proxy Statement shall comply as to form in all material re-
         spects with the requirements of the Exchange Act and the rules
         and regulations thereunder.

                   SECTION 4.9.  Absence of Certain Changes or Events.
         Except as contemplated by this Agreement or as disclosed in the
         Company Reports filed prior to the date hereof, since December
         31, 1996, the Company and its subsidiaries have conducted their
         respective businesses only in the ordinary course and consis-
         tent with prior practice and, as of the date hereof, there has
         not been (i) to the best of the Company's knowledge, any event
         or occurrence of any condition that has had or would have a
         Material Adverse Effect on the Company (other than changes due
         to industry-wide events or general economic conditions) or (ii)
         any material change in accounting methods, principles or prac-
         tices employed by the Company.

                   SECTION 4.10.  Change of Control Agreements.  Except
         as otherwise set forth on Schedule 4.10 to this Agreement de-
         livered by the Company to Parent on or prior to the date


                                       -31-
<PAGE>   36

         hereof, and except as disclosed in the Company Reports filed
         prior to the date hereof, neither the execution and delivery of
         this Agreement nor the consummation of the Transactions, will
         (either alone or in conjunction with any other event) result
         in, cause the accelerated vesting or delivery of, or increase
         the amount or value of, any payment or benefit to any employee
         of the Company.  Without limiting the generality of the fore-
         going, to the best of the Company's knowledge, no amount paid
         or payable by the Company in connection with the Transactions
         (either solely as a result thereof or as a result of such
         Transactions in conjunction with any other event) will be an
         "excess parachute payment" within the meaning of Section 280G
         of the Code.

                   SECTION 4.11.  Brokers.  No broker, finder or invest-
         ment banker (other than Montgomery Securities) is entitled to
         any brokerage, finder's or other fee or commission in connec-
         tion with this Agreement or the Transactions based upon ar-
         rangements made by or on behalf of the Company.  The Company
         has heretofore furnished to Parent a complete and correct copy
         of all agreements between the Company and Montgomery Securities
         pursuant to which such firm would be entitled to any payment
         relating to this Agreement or the Transactions.


                                       -32-
<PAGE>   37

                                    ARTICLE V

              REPRESENTATIONS AND WARRANTIES OF PARENT AND PURCHASER

                   Parent and Purchaser represent and warrant to the
         Company as follows:

                   SECTION 5.1.  Organization and Standing.  Each of
         Parent and Purchaser is a corporation duly organized, validly
         existing and in good standing under the laws of the State of
         Delaware and has full corporate power and authority to conduct
         its business as presently conducted and to enter into and per-
         form this Agreement and to carry out the Transactions.

                   SECTION 5.2.  Authority for Agreement.  The execu-
         tion, delivery and performance by each of Parent and Purchaser
         of this Agreement and the Amendment, and the consummation by
         each of Parent and Purchaser of the Transactions, has been duly
         authorized by all necessary corporate action.  This Agreement
         has been duly executed and delivered by Parent and Purchaser
         and, assuming the due authorization, execution and delivery by
         the Company, constitutes a legal, valid and binding obligation
         of each of Parent and Purchaser enforceable against Parent and
         Purchaser in accordance with its terms.

                   SECTION 5.3.  No Conflict.  The execution and de-
         livery of this Agreement by Parent and Purchaser do not, and
         the performance of this Agreement by Parent and Purchaser and


                                       -33-
<PAGE>   38

         the consummation of the Transactions will not, (i) conflict
         with or violate the certificate of incorporation or bylaws of
         Parent or Purchaser, (ii) conflict with or violate any law,
         rule, regulation, order, judgment or decree applicable to Par-
         ent or Purchaser or any of their respective subsidiaries or by
         which any property or asset of Parent or Purchaser or their
         respective subsidiaries is bound or affected, or (iii) result
         in any breach of or constitute a default (or an event which
         with notice or lapse of time or both would become a default)
         under, or give to others any right of termination, amendment,
         acceleration or cancellation of, or result in the creation of a
         lien or other encumbrance on any property or asset of Parent or
         Purchaser or their respective subsidiaries pursuant to, any
         note, bond, mortgage, indenture, contract, agreement, lease,
         license, permit, franchise or other instrument or obligation to
         which Parent or Purchaser or their respective subsidiaries is a
         party or by which Parent or Purchaser or their respective sub-
         sidiaries or any property or asset of any of them is bound or
         affected, except in the case of clauses (ii) and (iii) for any
         such conflicts, violations, breaches, defaults or other occur-
         rences which would not, individually or in the aggregate, pre-
         vent or delay the performance by Parent or Purchaser of their
         respective obligations under this Agreement or the consummation
         of the Transactions.


                                       -34-
<PAGE>   39

                   SECTION 5.4.  Required Filings and Consents.  The
         execution and delivery of this Agreement by Parent and Pur-
         chaser do not, and the performance of this Agreement by Parent
         and Purchaser will not, require any consent, approval, authori-
         zation or permit of, or filing with or notification to, any
         governmental or regulatory authority, domestic or foreign, ex-
         cept (i) for applicable requirements, if any, of the Exchange
         Act, state securities or Blue Sky Laws and filing and recorda-
         tion of appropriate merger documents as required by Delaware
         Law and (ii) where failure to obtain such consents, approvals,
         authorizations or permits, or to make such filings or notifica-
         tions, would not, individually or in the aggregate, prevent or
         delay the performance by Parent or Purchaser of any of their
         respective obligations under this Agreement or the consummation
         of the Transactions.

                   SECTION 5.5.  Offer Documents.  None of the Offer
         Documents nor any information supplied by Parent or Purchaser
         for inclusion in the Schedule 14D-9 shall, at the respective
         times the Offer Documents, the Schedule 14D-9 or any amendments
         or supplements thereto are filed with the SEC or are first pub-
         lished, sent or given to stockholders of the Company, as the
         case may be, contain any untrue statement of a material fact or
         omit to state any material fact required to be stated therein
         or necessary in order to make the statements made therein, in
         the light of the circumstances under which they are made, not


                                       -35-
<PAGE>   40

         misleading.  If a Stockholders' Meeting (as defined below) is
         held, the information supplied by Parent or Purchaser for in-
         clusion in the Proxy Statement shall not, on the date such
         Proxy Statement (or any amendment or supplement thereto) is
         first mailed to stockholders of the Company and at the time of
         the Stockholders' Meeting, contain any untrue statement of ma-
         terial fact, or omit to state any material fact required to be
         stated therein or necessary in order to make the statements
         made therein, in the light of the circumstances under which
         they are made, not misleading or necessary to correct any
         statement in any earlier communication with respect to the so-
         licitation of proxies for the Stockholders' Meeting which shall
         have become false or misleading.  The foregoing notwithstand-
         ing, neither Parent nor Purchaser makes any representation or
         warranty with respect to any information supplied by the Com-
         pany or any of its representatives which is contained in any of
         the foregoing documents.  The Offer Documents shall comply as
         to form in all material respects with the requirements of the
         Exchange Act and the rules and regulations thereunder.

                   SECTION 5.6.  Brokers.  No broker, finder or invest-
         ment banker is entitled to any brokerage, finder's or other fee
         or commission payable by the Company in connection with this
         Agreement and the Transactions based upon arrangements made by
         or on behalf of Parent or Purchaser.


                                       -36-
<PAGE>   41

                                   ARTICLE VI

                                    COVENANTS

                   SECTION 6.1.  Conduct of the Business Pending the
         Merger.   (a)  The Company covenants and agrees that between
         the date of this Agreement and the Effective Time, unless Par-
         ent shall otherwise agree in writing, (i) the businesses of the
         Company shall be conducted only in, and the Company shall not
         take any action except in, the ordinary course of business and
         in a manner consistent with prior practice, and (ii) the Com-
         pany shall use its reasonable best efforts to preserve substan-
         tially intact the business organization of the Company, to keep
         available the services of the current officers and employees of
         the Company and to preserve the current relationships of the
         Company with customers, suppliers and other persons with which
         the Company has significant business relations.

                   (b)  The Company agrees and covenants that between
         the date of this Agreement and the Effective Time, the Company
         shall not, nor shall the Company permit any of its subsidiaries
         to, (i) declare or pay any dividends on or make other distribu-
         tions in respect of any of its capital stock, except for divi-
         dends by a wholly owned subsidiary of the Company to the Com-
         pany or another wholly owned subsidiary of the Company, (ii)
         split, combine or reclassify any of its capital stock or issue
         or authorize or propose the issuance of any other securities in


                                       -37-
<PAGE>   42

         respect of, in lieu of or in substitution for shares of its
         capital stock, (iii) repurchase or otherwise acquire or permit
         any subsidiary to purchase or otherwise acquire, any shares of
         its capital stock, or (iv) issue, deliver or sell, or authorize
         or propose the issuance, delivery or sale of, any shares of its
         capital stock or any securities convertible into any such
         shares of its capital stock, or any rights, warrants or options
         to acquire any such shares or convertible securities, other
         than the issuance of Shares upon the exercise of Company Op-
         tions or Company Purchase Plan Options outstanding as of the
         date of this Agreement under the Company Stock Option Plan or
         the Company Stock Purchase Plan, respectively.

                   SECTION 6.2.  Access to Information; Confidentiality.
         (a)  From the date hereof to the Effective Time, the Company
         shall, and shall cause the officers, directors, employees, au-
         ditors and agents of the Company to, afford the officers, em-
         ployees and agents of Parent and Purchaser access at all rea-
         sonable times to the officers, employees, agents, properties,
         offices, plants and other facilities, books and records of the
         Company and its subsidiaries, and shall furnish Parent and Pur-
         chaser with financial, operating and other data and information
         as Parent or Purchaser, through its officers, employees or
         agents, may reasonably request.


                                       -38-
<PAGE>   43

                   (b)  No investigation pursuant to this Section 6.2
         shall affect any representation or warranty in this Agreement
         of any party hereto or any condition to the obligations of the
         parties hereto.

                   (c)  Information afforded or furnished to Parent or
         Purchaser by the Company pursuant to this Section 6.2 shall be
         kept confidential and shall not be disclosed to third parties
         except (i) with the consent of the Company, (ii) as may be re-
         quired by law, regulation or by legal process (including by
         deposition, interrogatory, request for documents, subpoena,
         civil investigative demand or similar process), or (iii) as may
         be necessary in connection with the consummation of the Trans-
         actions.

                   SECTION 6.3.  Notification of Certain Matters.  The
         Company shall give prompt notice to Parent, and Parent shall
         give prompt notice to the Company, of (i) the occurrence, or
         nonoccurrence, of any event which would be likely to cause any
         representation or warranty contained in this Agreement to be
         untrue or inaccurate and (ii) any failure by such party (or
         Purchaser, in the case of Parent) to comply with or satisfy any
         covenant, condition or agreement to be complied with or satis-
         fied by it hereunder; provided, however, that the delivery of


                                       -39-
<PAGE>   44

         any notice pursuant to this Section 6.3 shall not limit or oth-
         erwise affect the remedies available hereunder to the party
         receiving such notice.

                   SECTION 6.4.  Further Action; Reasonable Best Ef-
         forts.  Upon the terms and subject to the conditions hereof,
         each of the parties hereto shall use its reasonable best ef-
         forts to take, or cause to be taken, all appropriate action,
         and to do, or cause to be done, all things necessary, proper or
         advisable under applicable laws and regulations to consummate
         and make effective the Transactions, including, without limita-
         tion, using its reasonable best efforts to obtain all licenses,
         permits, consents, approvals, authorizations, qualifications
         and orders of governmental authorities and parties to contracts
         with the Company and its subsidiaries as are necessary for the
         consummation of the Transactions and to fulfill the conditions
         to the Offer and the Merger.  In case at any time after the Ef-
         fective Time any further action is necessary or desirable to
         carry out the purposes of this Agreement, the proper officers
         of Parent and the Surviving Corporation shall use their reason-
         able best efforts to take all such action.

                   SECTION 6.5.  Stockholders' Meeting.  (a)  If re-
         quired by Delaware Law in order to consummate the Merger, the
         Company, acting through the Company Board, shall, in accordance


                                       -40-
<PAGE>   45

         with applicable law and the Company Certificate of Incorpora-
         tion and Company Bylaws, (i) duly call, give notice of, convene
         and hold a special meeting of its stockholders as promptly as
         practicable following consummation of the Offer for the purpose
         of considering and taking action on this Agreement and the
         Merger (the "Stockholders' Meeting"), (ii) to cause the record
         date for the Stockholders' Meeting to be subsequent to the date
         on which Purchaser last purchases Shares pursuant to the Offer,
         and (iii) include in the Proxy Statement (A) the recommendation
         of the Company Board (with all directors who are designees of
         Parent abstaining) that the stockholders of the Company approve
         and adopt this Agreement and (B) the opinion of Montgomery Se-
         curities that the consideration to be received by the holders
         of Shares (other than Parent and Purchaser) in the Offer and
         the Merger is fair to such holders from a financial point of
         view.  The Company shall, if proxies are solicited, use its
         best efforts to solicit from holders of Shares entitled to vote
         at the Stockholders' Meeting proxies in favor of such approval
         and shall take all other action necessary or, in the reasonable
         judgment of Parent, helpful to secure the vote or consent of
         such holders required by Delaware Law to effect the Merger.  At
         the Stockholders' Meeting, Parent and Purchaser shall cause the
         Parent Shares and any Shares acquired in the Offer to be voted
         in favor of the approval and adoption of this Agreement and the
         Transactions.


                                       -41-
<PAGE>   46

                   (b)  The foregoing notwithstanding, in the event that
         Purchaser shall acquire such number of Shares that, when taken
         together with the Parent Shares, constitute at least 90% of the
         then outstanding Shares, the parties hereto agree, subject to
         Article VII, to take all necessary and appropriate action to
         cause the Merger to become effective in accordance with Section
         253 of Delaware Law, as promptly as practicable after such ac-
         quisition, without a meeting of the stockholders of the Com-
         pany.

                   SECTION 6.6.  Proxy Statement.  If required by ap-
         plicable federal securities law in order to consummate the
         Merger, as promptly as practicable following consummation of
         the Offer, the Company shall file a proxy statement with the
         SEC in accordance with the Exchange Act (the "Proxy Statement")
         and shall use its best efforts to have the Proxy Statement
         cleared by the SEC.  Parent, Purchaser and the Company shall
         also take any action required to be taken under Blue Sky Laws
         or state securities laws in connection with the Merger.  Par-
         ent, Purchaser and the Company shall cooperate with each other
         in taking such action and in the preparation of the Proxy
         Statement.  Parent and its counsel shall be given the opportu-
         nity to review the Proxy Statement and any amendments thereto
         prior to dissemination of the Proxy Statement to holders of
         Shares.  The Company shall provide Parent and its counsel with


                                       -42-
<PAGE>   47

         a copy of any written comments or telephonic notification of
         any verbal comments the Company may receive from the SEC or its
         staff with respect to the Proxy Statement promptly after the
         receipt thereof and shall permit Parent and its counsel to par-
         ticipate in the preparation of any written responses and tele-
         phonic notification of any verbal responses of the Company or
         its counsel.  Each of the Company, Parent and Purchaser agrees
         to use its reasonable best efforts, after consultation with the
         other parties hereto, to respond promptly to all such comments
         of or requests by the SEC and to cause the Proxy Statement and
         all required amendments and supplements to be mailed to the
         holders of Shares entitled to vote at the Stockholders' Meeting
         at the earliest practicable time.

                   SECTION 6.7.  Indemnification.  (a)  It is understood
         and agreed that all rights to indemnification by the Company
         now-existing in favor of each present and former director and
         officer of the Company (each an "Indemnified Party") as pro-
         vided in the Company Certificate of Incorporation or the Com-
         pany Bylaws, in each case as in effect on the date of this
         Agreement, or pursuant to any other agreements in effect on the
         date hereof, copies of which have been provided to Parent,
         shall survive the Merger and shall continue in full force and
         effect for a period of at least six years from the Effective
         Time.  Consistent with the foregoing, for a period of at least


                                       -43-
<PAGE>   48

         six years from the Effective Time, the Certificate of Incorpo-
         ration and Bylaws of the Surviving Corporation shall contain
         the provisions with respect to indemnification set forth, re-
         spectively, in the Company Certificate of Incorporation and
         Company Bylaws, which provisions shall not be amended, repealed
         or otherwise modified during such six year period in any manner
         that would adversely affect the rights thereunder of individu-
         als who, immediately prior to the Effective Time, were direc-
         tors, officers, employees or agents of the Company.

                   (b)  To the fullest extent permitted by applicable
         law, Parent will, for a period of six years from and after the
         Effective Time, indemnify and hold harmless each Indemnified
         Party with respect to all acts and omissions occurring before
         the Effective Time that are based on or arise out of the Indem-
         nified Party's service as a director or officer of the Company,
         including all acts or omissions in connection with the Amend-
         ment, this Agreement and the Transactions, to the extent which-
         ever of the following is most favorable to the Indemnified
         Party:  (i) any indemnification policy, practice, contract or
         other arrangement that the Company has with its directors at
         the date of this Agreement (copies of which have previously
         been furnished to Parent), (ii) indemnification provisions in
         Parent's then-existing certificate of incorporation or bylaws


                                       -44-
<PAGE>   49

         and (iii) any other then existing indemnification policy, prac-
         tice, contract or other arrangement that Parent has with its
         directors.

                   (c)  In the event the Surviving Corporation or any of
         its successors or assigns (i) consolidates with or merges into
         any other person and shall not be the continuing or surviving
         corporation or entity of such consolidation or merger or (ii)
         transfers all or substantially all of its properties and assets
         to any person, then, and in each such case, proper provision
         shall be made so that the successors and assigns of the Surviv-
         ing Corporation shall assume the obligations set forth in this
         Section 6.7.

                   SECTION 6.8.  Public Announcements.  Parent and the
         Company shall consult with each other before issuing any press
         release or otherwise making any public statements with respect
         to this Agreement or any Transaction and shall not issue any
         such press release or make any such public statement prior to
         such consultation, except as may be required by law or any
         listing agreement with a national securities exchange to which
         Parent or the Company is a party.

                   SECTION 6.9.  Redemption of Preferred Stock.  As
         promptly as practicable after the date hereof, the Company
         shall cause all of the outstanding Series A Preferred Shares to


                                       -45-
<PAGE>   50

         be redeemed in accordance with the Company Certificate of In-
         corporation as of a date not later than the day prior to the
         initial expiration date.

                  SECTION 6.10.  Parent Actions.  During the period
         prior to the purchase of Shares in the Offer, Parent shall use
         its reasonable best efforts not to interfere in any material
         respect with the Company's conduct of its day-to-day opera-
         tions; provided, however, that this Section 6.10 shall not
         limit or affect (i) the rights, duties and responsibilities of
         Parent's designees on the Company Board in their capacity as
         such or (ii) the rights and obligations of Parent under any
         contract or agreement with the Company.

                                   ARTICLE VII

                                   CONDITIONS

                   SECTION 7.1.  Conditions to the Obligation of Each
         Party.  The respective obligations of Parent, Purchaser and the
         Company to effect the Merger are subject to the satisfaction of
         the following conditions, unless waived in writing by all par-
         ties:

                   (a)  Stockholder Approval.  This Agreement and the
              Merger shall have been approved and adopted by the requi-
              site vote or consent of the stockholders of the Company to


                                       -46-
<PAGE>   51

              the extent required by Delaware Law, the Company Certifi-
              cate of Incorporation and the Company Bylaws.

                   (b)  No Order.  No foreign, United States or state
              governmental authority or other agency or commission or
              foreign, United States or state court of competent juris-
              diction shall have enacted, issued, promulgated, enforced
              or entered any law, rule, regulation, executive order,
              decree, injunction or other order (whether temporary, pre-
              liminary or permanent) which is then in effect and has the
              effect of:  (i) making the acquisition of Shares by Parent
              or Purchaser or any affiliate of either of them illegal or
              otherwise restricting, preventing or prohibiting consumma-
              tion of any of the Transactions, (ii) seeking to prohibit
              or limit materially the ownership or operation by the Com-
              pany, Parent or any of their respective subsidiaries of
              all or any material portion of the business or assets of
              the Company, Parent or any of their respective subsidiar-
              ies as a result of any Transaction, or (iii) compelling
              the Company, Parent, Purchaser or any of their respective
              subsidiaries to dispose of or hold separate all or any
              material portion of the business or assets of the Company,
              Parent, Purchaser or any of their respective subsidiaries
              as a result of any Transaction; provided, however, that
              each of the parties shall have used its reasonable efforts
              to prevent the entry of any such injunction or other order


                                       -47-
<PAGE>   52

              and to appeal as promptly as practicable any injunction or
              other order that may be entered.

                   (c)  Purchase of Shares in the Offer.  Purchaser
              shall have purchased all Shares validly tendered and not
              withdrawn pursuant to the Offer; provided, however, that
              this condition shall not be applicable to the obligations
              of Parent and Purchaser if, in breach of this Agreement or
              the terms of the Offer, Purchaser fails to purchase any
              Shares validly tendered and not withdrawn pursuant to the
              Offer.

                                  ARTICLE VIII

                        TERMINATION, AMENDMENT AND WAIVER

                   SECTION 8.1.  Termination.  This Agreement may be
         terminated and the Offer and the Merger may be abandoned at any
         time prior to the Effective Time:

                   (a)  By mutual written consent duly authorized by the
              Boards of Directors of Parent and the Company, if such
              termination is also approved by the Special Committee;

                   (b)  By either Parent or the Company if any court of
              competent jurisdiction or administrative agency, commis-
              sion, governmental or regulatory authority, domestic or
              foreign, shall have issued an order, decree, ruling or
              taken any other action restraining, enjoining or otherwise


                                       -48-
<PAGE>   53

              prohibiting the Offer or the Merger and such order, de-
              cree, ruling or other action shall have become final and
              nonappealable;

                   (c)  By either Parent, Purchaser or the Company if
              (i) the Effective Time shall not have occurred on or be-
              fore December 31, 1997; provided, however, that the right
              to terminate this Agreement under this Section 8.1(c)
              shall not be available to any party whose failure to ful-
              fill any obligation under this Agreement has been the
              cause of, or resulted in, the failure of the Effective
              Time to occur on or before such date;

                   (d)  By Parent if, due to an occurrence or circum-
              stance that would result in a failure of any condition set
              forth in Annex A hereto to be satisfied, (i) Purchaser
              shall not have commenced the Offer within 60 days follow-
              ing the date of this Agreement, (ii) the Offer shall have
              been terminated or shall have expired in accordance with
              its terms without Purchaser having accepted for payment
              any Shares pursuant to the Offer or (iii) Purchaser shall
              have failed to pay for Shares pursuant to the Offer within
              90 days following the commencement of the Offer, unless,
              in the case of clause (iii) such failure to pay for Shares
              shall have been caused by or resulted from the failure of
              Parent or Purchaser to perform in any material respect any


                                       -49-
<PAGE>   54

              material covenant or agreement of either of them contained
              in this Agreement or the material breach by Parent or Pur-
              chaser of any material representation or warranty of ei-
              ther of them contained in this Agreement;

                        (e)  By the Company, upon approval of the Com-
              pany Board and a majority of the members of the Special
              Committee, if due to an occurrence or circumstance that
              would result in a failure to satisfy any of the conditions
              set forth in Annex A hereto, Purchaser shall have (i)
              failed to commence the Offer within 60 days following the
              date of this Agreement, (ii) terminated the Offer without
              having accepted any Shares for payment thereunder, or
              (iii) failed to pay for Shares pursuant to the Offer
              within 90 days following the commencement of the Offer,
              unless such failure to pay for Shares shall have been
              caused by or resulted from the failure of the Company to
              perform in any material respect any material covenant or
              agreement of it contained in this Agreement or the mate-
              rial breach by the Company of any material representation
              or warranty of it contained in this Agreement; or

                        (f)  By the Company, upon approval of the Com-
              pany Board and a majority of the members of the Special
              Committee, if Parent shall have breached in any material
              respect its covenant set forth in Section 6.10, and Parent


                                       -50-
<PAGE>   55

              continues such breach following written notice by the Com-
              pany to Parent thereof.

                   SECTION 8.2.  Effect of Termination.  In the event of
         the termination of this Agreement pursuant to Section 8.1, this
         Agreement shall forthwith become void, and there shall be no
         liability on the part of any party hereto, provided that noth-
         ing herein shall relieve any party from liability for any wil-
         ful breach hereof.

                   SECTION 8.3.  Amendments.  This Agreement may not be
         amended except by action of the board of directors of each of
         the parties hereto (and, in the case of the Company, with the
         approval of the Special Committee) set forth in an instrument
         in writing signed on behalf of each of the parties hereto; pro-
         vided, however, that after approval of the Merger by the stock-
         holders of the Company (if required), no amendment may be made
         without the further approval of the stockholders of the Company
         if the effect of such amendment would be to (i) reduce the
         Merger Consideration or change the form thereof or (ii) alter
         or change any of the terms and conditions of this Agreement if
         any of such alterations or changes, alone or in the aggregate,
         would be materially adverse to the stockholders of the Company
         (other than Parent and its affiliates).


                                       -51-
<PAGE>   56

                   SECTION 8.4.  Waiver.  At any time prior to the Ef-
         fective Time, whether before or after any Stockholders' Meet-
         ing, any party hereto, by action taken by its board of direc-
         tors (and, in the case of the Company, with the approval of the
         Special Committee), may (i) extend the time for the performance
         of any of the covenants, obligations or other acts of any other
         party hereto or (ii) waive any inaccuracy of any representa-
         tions or warranties or compliance with any of the agreements,
         covenants or conditions of any other party or with any condi-
         tions to its own obligations.  Any agreement on the part of a
         party hereto to any such extension or waiver shall be valid
         only if set forth in an instrument in writing signed on behalf
         of such party by its duly authorized officer.

                                   ARTICLE IX

                               GENERAL PROVISIONS

                   SECTION 9.1.  No Third Party Beneficiaries.  Other
         than the provisions of Section 6.7, nothing in this Agreement
         shall confer any rights or remedies upon any person other than
         the parties hereto.

                   SECTION 9.2.  Entire Agreement.  This Agreement (in-
         cluding any Annex or Schedule hereto) and the Stockholders
         Agreement (as amended by the Amendment) constitute the entire
         agreement among the parties with respect to the subject matter
         hereof and supersedes any prior understandings, agreements, or


                                       -52-
<PAGE>   57

         representations by or among the parties, written or oral, with
         respect to the subject matter hereof.

                   SECTION 9.3.  Succession and Assignment.  This Agree-
         ment shall be binding upon and inure to the benefit of the par-
         ties named herein and their respective successors.  No party
         may assign either this Agreement or any of its rights, inter-
         ests, or obligations hereunder without the prior written ap-
         proval of the other party, provided, however, that Purchaser
         may freely assign its rights to another wholly owned subsidiary
         of Parent without such prior written approval.

                   SECTION 9.4.  Counterparts.  This Agreement may be
         executed in two or more counterparts, each of which shall be
         deemed an original but all of which together shall constitute
         one and the same instrument.

                   SECTION 9.5.  Headings.  The section headings con-
         tained in this Agreement are inserted for convenience only and
         shall not affect in any way the meaning or interpretation of
         this Agreement.

                   SECTION 9.6.  Governing Law.  This Agreement shall be
         governed by and construed in accordance with the laws of the
         State of Delaware, without regard to principles of conflicts of
         law thereof.


                                       -53-
<PAGE>   58

                   SECTION 9.7.  Severability.  Any term or provision of
         this Agreement that is invalid or unenforceable in any situa-
         tion in any jurisdiction shall not affect the validity or en-
         forceability of the remaining terms and provisions hereof or
         the validity or enforceability of the offending term or provi-
         sion in any other situation or in any other jurisdiction.  If
         the final judgment of a court of competent jurisdiction de-
         clares that any term or provision hereof is invalid or unen-
         forceable, the parties agree that the court making the determi-
         nation of invalidity or unenforceability shall have the power
         to reduce the scope, duration, or area of the term or provi-
         sion, to delete specific words or phrases, or to replace any
         invalid or unenforceable term or provision with a term or pro-
         vision that is valid and enforceable and that comes closest to
         expressing the intention of the invalid or unenforceable term
         or provision, and this Agreement shall be enforceable as so
         modified after the expiration of the time within which the
         judgment may be appealed.

                   SECTION 9.8.  Specific Performance.  Each of the par-
         ties acknowledges and agrees that the other party would be dam-
         aged irreparably in the event any of the provisions of this
         Agreement are not performed in accordance with their specific
         terms or otherwise are breached.  Accordingly, each of the par-
         ties agrees that the other party shall be entitled to an in-
         junction or injunctions to prevent breaches of the provisions


                                       -54-
<PAGE>   59

         of this Agreement and to enforce specifically this Agreement
         and the terms and provisions hereof in any action instituted in
         any court of the United States or any state thereof having ju-
         risdiction over the parties and the matter, in addition to any
         other remedy to which it may be entitled, at law or in equity.

                   SECTION 9.9.  Construction.  The language used in
         this Agreement shall be deemed to be the language chosen by the
         parties hereto to express their mutual intent, and no rule of
         strict construction shall be applied against any party.

                   SECTION 9.10.  Non-Survival of Representations and
         Warranties.  None of the representations and warranties in this
         Agreement or in any instrument delivered pursuant to this
         Agreement shall survive the Effective Time.  Nothing in this
         Section 9.10 shall limit any covenant or agreement of the par-
         ties which by its terms contemplates performance after the Ef-
         fective Time of the Merger.

                   SECTION 9.11.  Certain Definitions.  For purposes of
         this Agreement, the term "affiliate" shall have the same mean-
         ing as set forth in Rule 12b-2 of the Regulation 12B of the
         General Rules and Regulations under the Exchange Act, and the
         term "person" shall mean any individual, corporation, partner-
         ship (general or limited), limited liability company, limited


                                       -55-
<PAGE>   60

         liability partnership, trust, joint venture, joint-stock com-
         pany, syndicate, association, entity, unincorporated organiza-
         tion or government or any political subdivision, agency or in-
         strumentality thereof.

                   SECTION 9.12.  Fees and Expenses.  Whether or not the
         Merger is consummated, all costs and expenses incurred in con-
         nection with the Offer, this Agreement and the Transactions
         shall be paid by the party incurring such expenses.

                   SECTION 9.13.  Notices.  All notices, requests,
         claims, demands and other communications hereunder shall be in
         writing and shall be given (and shall be deemed to have been
         duly given upon receipt) by delivery in person, by telecopy or
         by registered or certified mail (postage prepaid, return re-
         ceipt requested) to the respective parties at the following
         addresses, or at such other address for a party as shall be
         specified in a notice given in accordance with this Section
         9.13:

                   If to Parent or Purchaser:

                        Monsanto Company
                        800 N. Lindbergh Boulevard
                        St. Louis, MO  63167
                        Telecopier:  (314) 694-6572
                        Attn:  R. William Ide, III, Esq.


                                       -56-
<PAGE>   61

                   with a copy to:

                        Wachtell, Lipton, Rosen & Katz
                        51 West 52nd Street
                        New York, NY  10019
                        Telecopier:  (212) 403-2000
                        Attn:  Eric S. Robinson, Esq.

                   If to the Company:

                        Calgene, Inc.
                        1920 Fifth Street
                        Davis, CA  95616
                        Telecopier:  (916) 753-1510
                        Attn:  Lloyd M. Kunimoto

                   with copies to:

                        Hale and Dorr LLP
                        60 State Street
                        Boston, MA  02109
                        Telecopier:  (617) 526-5000
                        Attn:  Mark G. Borden, Esq.

                   and to:

                        Venture Law Group
                            Professional Corporation
                        2800 Sand Hill Road
                        Menlo Park, CA  94025
                        Telecopier:  (415) 233-8386
                        Attn:  Steven J. Tonsfeldt, Esq.


                                       -57-
<PAGE>   62

                   IN WITNESS WHEREOF, Parent, Purchaser and the Company
         have caused this Agreement to be executed as of the date first
         written above by their respective officers thereunto duly au-
         thorized.


                                       MONSANTO COMPANY

                                       /s/ Hendrik A. Verfaillie
                                       -------------------------------
                                       By: Hendrik A. Verfaillie
                                       Title: Executive Vice President


                                       MONSANTO ACQUISITION COMPANY, INC.

                                       /s/ Hendrik A. Verfaillie
                                       -------------------------------
                                       By: Hendrik A. Verfaillie
                                       Title: Executive Vice President


                                       CALGENE, INC.

                                       /s/ Lloyd M. Kunimoto
                                       -------------------------------
                                       By: Lloyd M. Kunimoto
                                       Title: Acting Chief Executive Officer
                                              and President


                                       -58-
<PAGE>   63

                                     ANNEX A

                             CONDITIONS TO THE OFFER

                   Any other provision of the Offer notwithstanding,
         Purchaser shall not be required to accept for payment or may
         delay the acceptance for payment of any Shares, or may termi-
         nate the Offer and not accept for payment any Shares, if (i)
         the First Minimum Condition shall not have been satisfied as of
         the expiration of the Offer (as it may be extended by Purchaser
         from time to time), (ii) the Second Minimum Condition shall not
         have been satisfied as of the expiration of the Offer (as it
         may be extended by Purchaser from time to time, but subject to
         the waiver requirements of Section 1.1(a)), or (iii) at any
         time on or after March 31, 1997 and prior to the acceptance for
         payment of Shares, any of the following conditions exist:

                   (a)  there shall have occurred and be remaining in
              effect (i) any general suspension of trading in, or limi-
              tation on prices for, securities on The Nasdaq Stock Mar-
              ket, Inc.'s National Market (ii) a declaration of a bank-
              ing moratorium or any suspension of payments in respect of
              banks in the United States, (iii) any limitation imposed
              by any government, governmental agency or authority on the
              extension of credit by banks or other lending institutions
              in the United States, or (iv) the commencement of a war or


                                       A-1
<PAGE>   64

              armed hostilities or other international calamity directly
              or indirectly involving the United States;

                   (b)  an order shall have been entered or an injunc-
              tion shall have been issued and remain in effect (i) re-
              straining or prohibiting the making or consummation of the
              Offer or the Merger, (ii) making the purchase of, or pay-
              ment for, some or all of the Shares illegal or (iii) im-
              posing limitations on the ability of Purchaser effectively
              to acquire or to hold or to exercise full rights of owner-
              ship of the Shares, including, without limitation, the
              right to vote the Shares purchased by Purchaser on all
              matters properly presented to the stockholders of the Com-
              pany; or

                   (c)  any statute, rule, regulation or referendum
              shall be enacted, enforced, promulgated or deemed ap-
              plicable to (i) Parent or any of its affiliates or subsid-
              iaries or the Company or any of its subsidiaries or (ii)
              the Offer or the Merger, which could reasonably be ex-
              pected, directly or indirectly, to result in any of the
              consequences referred to in clauses (i) through (iii) of
              paragraph (b) above; or

                   (d)  this Agreement shall have been terminated in
              accordance with its terms or Parent and the Company shall


                                       A-2
<PAGE>   65

              have agreed that Parent shall amend or terminate the Offer
              or postpone the payment for Shares pursuant thereto; or

                   (e)  any of the representations and warranties of the
              Company set forth in this Agreement that are qualified as
              to materiality or Material Adverse Effect on the Company
              shall not be true and correct or any such representations
              and warranties that are not so qualified shall not be true
              and correct in any material respect; or

                   (f)  the Company shall have failed to perform or com-
              ply with in any material respect any of the agreements or
              covenants of the Company to be performed or complied with
              by it under this Agreement; or

                   (g)  all of the Series A Preferred Shares shall not
              have been redeemed;

         which in the reasonable judgment of Parent with respect to each
         and every matter referred to above and regardless of the cir-
         cumstance (including any action or inaction by Parent) giving
         rise to any such condition, makes it inadvisable to proceed
         with the Offer, the acceptance for payment or payment for the
         Shares in the Offer, or the Merger.

                   The foregoing conditions are for the benefit of Par-
         ent and Purchaser only and may be asserted regardless of the
         circumstances giving rise to any such conditions (including any


                                       A-3
<PAGE>   66

         action or inaction by Parent).  Each of the foregoing condi-
         tions may be waived by Purchaser in whole or in part, other
         than the First Minimum Condition, which may not be waived with-
         out the consent of the Special Committee.  The failure to exer-
         cise any of the foregoing rights shall not be deemed a waiver
         of any such right, and each right shall be deemed a continuing
         right which may be asserted at any time and from time to time.


                                       A-4

<PAGE>   1
                                                                  EXHIBIT 2

                                                                  EXECUTION COPY

                                    AMENDMENT

                   AMENDMENT (the "Amendment") dated as of March 31,
         1997, among Calgene, Inc., a Delaware corporation (the "Com-
         pany"), and Monsanto Company, a Delaware corporation ("Par-
         ent").

                              W I T N E S S E T H:

                   WHEREAS, Parent and the Company are parties to the
         Amended and Restated Stockholders Agreement, dated as of Novem-
         ber 12, 1996 (the "Stockholders Agreement");

                   WHEREAS, the Company, Parent and a wholly owned sub-
         sidiary of Parent ("Purchaser") have entered into an Agreement
         and Plan of Merger (the "Merger Agreement"), dated as of the
         date hereof, pursuant to which, among other things, Purchaser
         shall make a cash tender offer (the "Offer") to acquire all of
         the issued and outstanding shares of common stock, par value
         $.001 per share, of the Company (the "Shares") not currently
         owned by Parent or Purchaser, and, following consummation of
         the Offer, Purchaser shall, upon the terms and subject to the
         conditions of the Merger Agreement, merge with and into the
         Company (the "Merger" and together with the Offer and the other
         transactions contemplated by the Merger Agreement, the "Trans-
         actions");

<PAGE>   2

                   WHEREAS, the Special Committee (the "Special Commit-
         tee") of the Board of Directors of the Company (the "Company
         Board"), consisting of three Independent Directors (as defined
         in the Stockholders Agreement), has unanimously recommended
         that the Company Board approve the Merger Agreement and the
         Transactions, which recommendation was based in part on the
         opinion of Montgomery Securities, Inc., independent financial
         advisors to the Special Committee, that the consideration to be
         received by the holders of Shares (other than Parent and Pur-
         chaser) in the Offer and the Merger is fair to such holders
         from a financial point of view;

                   WHEREAS, the Company Board has duly approved and au-
         thorized the Merger Agreement and the Transactions contemplated
         thereby and has recommended that holders of Shares accept the
         Offer, and, if approval is required by applicable law, approve
         and adopt the Merger Agreement and the Merger;

                   WHEREAS, Parent and the Company (with the unanimous
         approval of the Independent Directors) have agreed to enter in
         this Amendment;

                   NOW, THEREFORE, in consideration of the foregoing and
         the respective representations, warranties, covenants and
         agreements contained in this Amendment, the parties hereto
         agree as follows:


                                      - 2 -
<PAGE>   3

                                    ARTICLE I

                                   DEFINITIONS

                   SECTION 1.1.   Defined Terms.  Capitalized terms de-
         fined in the Stockholders Agreement and used herein shall have
         the meanings given to them in the Stockholders Agreement.

                                   ARTICLE II

                         REPRESENTATIONS AND WARRANTIES

                   SECTION 2.1.   Representations and Warranties of the
         Company.  The Company hereby represents and warrants to Parent
         as follows:

                   (a)  Amendment Approved.  This Amendment has been
              approved, in accordance with Section 6.3 of the Stockhold-
              ers Agreement, by all of the Independent Directors of the
              Company.

                   (b)  Required Actions Taken.  Each of the Company,
              the Company Board, the Special Committee and the Indepen-
              dent Directors has taken any action and given any consent
              or approval required of it or them required to permit the
              acquisition of Shares by Purchaser in the Offer, the en-
              tering into of the Merger Agreement by the Company and the
              consummation of the Transactions contemplated thereby wit-
              hout violating or conflicting with the Stockholders Agree-
              ment.  The actions referred to in the previous sentence


                                      - 3 -
<PAGE>   4

              include, without limitation, (i) approval by the disinter-
              ested Directors of the Company, based upon a fairness opi-
              nion delivered to the Company Board by an investment bank-
              ing firm, of the price to be offered to holders of the
              Shares in the Offer and (ii) approval of the Merger Agree-
              ment and the Transactions by a majority of the Company
              Board, including at least two Company Directors.

                                   ARTICLE III

                                   AMENDMENTS

                   SECTION 3.1.   Definitions.  Section 2.1 of the
         Stockholders Agreement is hereby amended by adding the follow-
         ing definitions at their respective appropriate alphabetic-
         order locations in such section:

                   "`Merger' shall have the meaning ascribed to it in
              the Merger Agreement."

                   "`Merger Agreement' shall mean that certain Agreement
              and Plan of Merger (the "Merger Agreement"), dated as of
              March 31, 1997, by and among the Company, Monsanto, and
              Purchaser."

                   "`Offer' shall have the meaning ascribed to it in the
              Merger Agreement."


                                      - 4 -
<PAGE>   5

                   "`Purchaser' shall mean Monsanto Acquisition Company,
              Inc., a Delaware corporation and a wholly owned subsidiary
              of Monsanto."

                   "`Transactions' shall mean the transactions contem-
              plated by the Merger Agreement, including, without limita-
              tion, the Offer and the Merger."

                   SECTION 3.2.   Amendment to Section 3.6(a).  Section
         3.6(a) of the Stockholders Agreement is hereby amended by re-
         placing the period at the end of clause (iii) with a semicolon
         and adding the following clause (iv) after clause (iii):

                   "(iv)  Any of the Transactions."

                   SECTION 3.3.   Amendment to Section 6.9.  Section 6.9
         of the Stockholders Agreement is hereby amended by deleting the
         text thereof in its entirety and replacing it with the follow-
         ing:

                   "SECTION 6.9.  Termination.  In the event the Offer
              is consummated, this Agreement shall terminate and cease
              to be of any force or effect as of the date Purchaser
              first accepts for payment any Shares tendered pursuant to
              the Offer."


                                      - 5 -
<PAGE>   6

                                   ARTICLE IV

                               GENERAL PROVISIONS

                   SECTION 4.1.   No Other Amendments.  Except as ex-
         pressly amended, modified and supplemented hereby, the provi-
         sions of the Stockholders Agreement are and shall remain in
         full force and effect.

                   SECTION 4.2.   Governing Law.  This Amendment shall
         be governed in all respects by the laws of the State of Dela-
         ware (exclusive of such state's choice of laws rules).

                   SECTION 4.3.   Counterparts.  This Amendment may be
         executed in any number of counterparts, each of which shall be
         an original, but all of which together shall constitute one
         instrument.

                   SECTION 4.4.   Headings.  Headings as to the contents
         of particular articles and sections are for convenience only
         and are in no way to be construed as part of this Amendment or
         as a limitation of the scope of the particular articles or sec-
         tions to which they refer.


                                      - 6 -
<PAGE>   7

                   IN WITNESS WHEREOF, Parent and the Company have
         caused this Amendment to be executed as of the date first writ-
         ten above by their respective officers thereunto duly autho-
         rized.


                                            MONSANTO COMPANY

                                            /s/ Hendrik A. Verfaillie
                                            ----------------------------
                                            By: Hendrik A. Verfaillie
                                            Title: Executive Vice President


                                            CALGENE, INC.

                                            /s/ Lloyd M. Kunimoto
                                            ----------------------------
                                            By: Lloyd M. Kunimoto
                                            Title: Acting Chief Executive
                                                   Officer and President


                                      - 7 -

<PAGE>   1
 
MONSANTO AGREES TO ACQUIRE
REMAINING SHARES OF CALGENE
FOR $8 PER SHARE
 
     ST. LOUIS, April 1, 1997 -- Monsanto Company. announced today that it had
entered into a definitive agreement with Calgene Inc. to acquire the remaining
shares of Calgene that Monsanto doesn't already own for $8 per share in cash, or
approximately $240 million. The agreement was unanimously approved by a special
committee composed of Calgene's directors who are neither designees of Monsanto
nor Calgene employees.
 
     The agreement provides that Monsanto will commence a tender offer by April
7, 1997. The tender offer will be conditioned upon the tender of a majority of
the outstanding Calgene shares not owned by Monsanto and other customary
conditions. Following the completion of the tender offer, Monsanto would acquire
the remaining Calgene shares in a second-step merger at the same cash price per
share.
<PAGE>   2
 
     Monsanto currently owns 36.4 million shares of Calgene common stock, or
approximately 54.6 percent of the outstanding Calgene shares.
 
     "This will promote the closer working relationships and the greater sharing
of technologies that are only possible with full ownership of the company," said
Monsanto Executive Vice President Hendrik A. Verfaillie. "We can now better
realize the benefits from Calgene's research by combining our technology efforts
and bringing products to market more rapidly."
 
     "We're extremely pleased to be joining forces with Monsanto," said Lloyd M.
Kumimoto, president of Calgene. "Calgene has built a robust pipeline of products
and technologies that can be aggressively commercialized through Monsanto's
network of operating companies, affiliates and strategic partners."
 
     Monsanto first invested in Calgene in March 1996 by acquiring a 49.9
percent equity stake. In November 1996, Monsanto purchased an additional 6.25
million shares to raise its equity ownership to 54.6 percent of the shares
outstanding. In January 1997, the company made a proposal to the board of
directors of Calgene to acquire the remaining shares outstanding at the price of
$7.25 per share. This proposal was subject to the approval of a Calgene special
committee.
 
     Monsanto also announced that it and Calgene have entered into an agreement
in principle to settle putative class actions, which were filed in the
<PAGE>   3
 
Delaware Chancery Court following the announcement of Monsanto's initial
acquisition proposal. The lawsuits had challenged the fairness to Calgene's
shareowners of the transaction as initially proposed. The agreement is subject
to the negotiation of a definitive settlement agreement.
 
     Calgene has done significant research in oils, fresh produce and cotton.
Calgene's oil products include Laurical laurate canola and other canola oil
products that have applications in low-fat foods, pharmaceuticals, nutritional
supplements, confectionery products, margarine and shortening, personal care
products, lubricants and soaps and detergents. Other products under development
include fresh tomatoes and strawberries with improved flavor and shelf-life,
naturally colored cotton fibers, and BXN herbicide-tolerant and Bollgard
insect-protected cotton.
 
     "We see a number of connections between Monsanto and Calgene's research and
believe our combined strengths will help us accelerate the introduction of these
products," Verfaillie added. "Calgene's oils research will be particularly
valuable to us as we explore new applications for improved oils in Monsanto's
food ingredients and pharmaceutical businesses."
 
     Monsanto is a global leader in agricultural biotechnology and in the
development and marketing of improved food and fiber crops. Monsanto is in the
process of creating a new life sciences company that will combine its existing
<PAGE>   4
 
agricultural, food and pharmaceutical businesses and seek to develop new
businesses that capture synergies among these fields.
 
     Calgene is an agricultural biotechnology company based in Davis,
California. Stoneville Pedigreed Seed Company and N.T. Gargiulo, a produce
company, are subsidiaries of Calgene.


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