Document:

THE SECURITY  REPRESENTED BY THIS  CERTIFICATE  HAS BEEN ACQUIRED FOR INVESTMENT
AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF.
NO SUCH SALE OR DISPOSITION  MAY BE EFFECTED  WITHOUT AN EFFECTIVE  REGISTRATION
STATEMENT  RELATED THERETO OR AN OPINION OF COUNSEL  SATISFACTORY TO THE COMPANY
THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933.

                   WARRANT TO PURCHASE SHARES OF COMMON STOCK
                          OF SENESCO TECHNOLOGIES, INC.

                                                      Dated: October 1, 1999

      This certifies that the Parenteau  Corporation,  Inc. (the "Holder"),  for
value  received is entitled,  subject to the terms set forth below,  to purchase
from Senesco  Technologies,  Inc., a Delaware  corporation (the "Company"),  One
Hundred Thousand (100,000) fully paid and nonassessable  shares, on a post-Stock
Split adjusted basis ("Stock Split" is defined as the two-for-one  forward stock
split of the Company's  Common Stock  effective  October 25, 1999) (the "Warrant
Shares"), of the Company's common stock, $.01 par value (the "Common Stock"), at
a price of $3.50 per share (the "Exercise Price").

     1.  Exercise  Price.  The Exercise  Price is $3.50 for each share of Common
         ---------------
Stock,  which is the Fair  Market  Value per  share of Common  Stock on the date
hereof,  as  determined  by the Board.  Fair Market Value shall mean the closing
price of the Company's  Common Stock as reported on the NASD OTC Bulletin Board,
Nasdaq National Market, Nasdaq SmallCap Market, or such other stock exchange.

     2.  Exercise of Warrant.  This Warrant shall be exercisable during its term
         -------------------
as follows:

     (i)  Right to Exercise
          -----------------

          (a) Subject to  subsections  3(i)(b) and (c) below,  shares subject to
     this Warrant shall become  exercisable  based upon the  following  schedule
     until all of such shares are exercisable:

                 Vesting Period               Number of Shares Exercisable
                 --------------               ----------------------------
                 October 1, 1999                         20,000
               September 30, 2000                        30,000
               September 30, 2001                        30,000
                December 31, 2001                        20,000

          (b) This Warrant may not be exercised for a fraction of a Share.

          (c) In no event  may  this  Warrant  be  exercised  after  the date of
     expiration of the term of this Warrant as set forth in Section 8 below.

<PAGE>

     (ii) Method of  Exercise.  This  Warrant  shall be  exercisable  by written
          -------------------
notice in the form  attached  as Exhibit A, which  shall  state the  election to
exercise  the  Warrant,  the number of Shares in respect of which the Warrant is
being  exercised,  and  such  other  representations  and  agreements  as to the
holder's investment intent with respect to such shares of Common Stock as may be
required by the Company. Such written notice shall be signed by Holder and shall
be delivered in person or by certified mail to the President, Secretary or Chief
Financial  Officer of the Company or such other agent  designated  in writing by
the Company.  The written notice shall be accompanied by payment of the exercise
price.  This Warrant shall be deemed to be exercised upon receipt by the Company
of such written notice accompanied by the exercise price. Until the issuance (as
evidenced  by the  appropriate  entry on the books of the  Company  or of a duly
authorized  transfer agent of the Company) of the stock  certificate  evidencing
such  Shares,  no right to vote or receive  dividends  or any other  rights as a
shareholder shall exist with respect to the Warrant Stock,  notwithstanding  the
exercise of the  Warrant.  The Company  shall issue (or cause to be issued) such
stock certificate promptly upon exercise of the Warrant.

          No shares will be issued pursuant to the exercise  of a Warrant unless
such issuance and such exercise shall comply with all relevant provisions of law
and the  requirements  of any stock  exchange  upon which the Shares may then be
listed.  Assuming such  compliance,  for income tax purposes the Shares shall be
considered  transferred  to the  Holder  on the date on  which  the  Warrant  is
exercised with respect to such Shares.

     4. Investment Representations; Restrictions on Transfer.
        ----------------------------------------------------

     (i)  By receipt of this Warrant,  by its  execution  and by its exercise in
whole or in part, Holder represents to the Company the following:

          (a) Holder understands that this Warrant and any Shares purchased upon
     its exercise are securities, the issuance of which requires compliance with
     federal and state securities laws.

          (b) Holder is aware of the  Company's  business  affairs and financial
     condition  and has  acquired  sufficient  information  about the Company to
     reach an informed  and  knowledgeable  decision to acquire the  securities.
     Holder is  acquiring  these  securities  for  investment  for  Holder's own
     account only and not with a view to, or for resale in connection  with, any
     "distribution" thereof within the meaning of the Securities Act of 1933, as
     amended (the "Securities Act").

          (c) Holder acknowledges and understands that the securities constitute
     "restricted   securities"  under  the  Securities  Act  and  must  be  held
     indefinitely  unless they are subsequently  registered under the Securities
     Act or an exemption  from such  registration  is available.  Holder further
     acknowledges  and  understands  that the Company is under no  obligation to
     register the securities. Holder understands that the certificate evidencing
     the securities will be imprinted with a legend which prohibits the transfer
     of the securities  unless they are registered or such  registration  is not
     required in the opinion

                                      -2-
<PAGE>

     of counsel  satisfactory to the Company and any other legend required under
     applicable state securities laws.

          (d) Holder is familiar  with the  provisions of Rule 701 and Rule 144,
     each  promulgated  under the Securities Act,  which,  in substance,  permit
     limited  public resale of  "restricted  securities"  acquired,  directly or
     indirectly,  from the issuer thereof,  in a non-public  offering subject to
     the  satisfaction  of certain  conditions.  Rule 701  provides  that if the
     issuer  qualifies  under Rule 701 at the time of exercise of the Warrant by
     the  Holder,  such  exercise  will be exempt  from  registration  under the
     Securities  Act.  In the event the  Company  later  becomes  subject to the
     reporting  requirements  of Section 13 or 15(d) of the Securities  Exchange
     Act of 1934,  ninety (90) days thereafter the securities  exempt under Rule
     701 may be resold, subject to the satisfaction of certain of the conditions
     specified by Rule 144,  including  among other  things:  (1) the sale being
     made  through  a broker  in an  unsolicited  "broker's  transaction"  or in
     transactions  directly  with a market maker (as said term is defined  under
     the Securities Exchange Act of 1934); and, in the case of an affiliate, (2)
     the availability of certain public  information about the Company,  and the
     amount of securities being sold during any three-month period not exceeding
     the limitations  specified in Rule 144(e),  if applicable.  Notwithstanding
     this  paragraph  4(i)(d),   the  Holder  acknowledges  and  agrees  to  the
     restrictions set forth in paragraph 4(ii) below.

          In the event that the Company  does not qualify  under Rule 701 at the
     time of  exercise  of the  Warrant,  then the  securities  may be resold in
     certain limited  circumstances subject to the provisions of Rule 144, which
     requires  among  other  things:  (1) the  availability  of  certain  public
     information  about the Company;  (2) the resale  occurring not earlier than
     the time period  prescribed by Rule 144 after the party has purchased,  and
     made full payment for, within the meaning of Rule 144, the securities to be
     sold; and (3) in the case of an affiliate,  or of a  non-affiliate  who has
     held the securities  less than the time period  prescribed by Rule 144, the
     sale being made through a broker in an unsolicited  "broker's  transaction"
     or in  transactions  directly  with a market maker (as said term is defined
     under the  Securities  Exchange  Act of 1934) and the amount of  securities
     being  sold  during any three  month  period not  exceeding  the  specified
     limitations stated therein, if applicable.

     (ii) Holder agrees,  in connection with an underwritten  public offering of
the Company's  securities,  (1) not to sell, make short sale of, loan, grant any
options for the purchase of, or otherwise  dispose of any shares of Common Stock
of the  Company  held  by  Holder  (other  than  those  shares  included  in the
registration)  without the prior written  consent of the  underwriters  managing
such  underwritten  public offering of the Company's  securities for a period of
one hundred eighty (180) days from the effective date of such  registration (the
"Lock Up Period"),  and (2) further  agrees to execute any agreement  reflecting
clause (1) above,  or extending  the Lock Up Period,  as may be requested by the
underwriters at the time of the public offering.

     5.  Method of Payment.  Payment of the exercise price shall be made by cash
         -----------------
or check.

                                      -3-
<PAGE>

     6.  Restrictions  on  Exercise.  This  Warrant may not be  exercised if the
         --------------------------
issuance  of such  Shares  upon  such  exercise  or the  method  of  payment  of
consideration  for such shares would  constitute  a violation of any  applicable
federal or state securities or other law or regulation, including any rule under
the Code of Federal  Regulations as promulgated by the Federal Reserve Board. As
a condition to the exercise of this Warrant,  the Company may require  Holder to
make any  representation  and  warranty to the Company as may be required by any
applicable law or regulation.

     7.  Non-Transferability of Warrant.  This Warrant may not be transferred in
         ------------------------------
any manner other than by will or by the laws of descent or distribution  and may
be  exercised  during the  lifetime of Holder only by Holder.  The terms of this
Warrant shall be binding upon the executors,  administrators,  heirs, successors
and assigns of Holder.

     8.  Term of Warrant.  This Warrant may not be exercised more than ten years
         ---------------
from the date of grant of this  Warrant,  and may be exercised  during such term
only in accordance with the terms of this Warrant Agreement.

     9.  Adjustments  Upon Changes in  Capitalization  or Merger.  The number of
         -------------------------------------------------------
shares  of  Common  Stock   covered  by  each   outstanding   Warrant  shall  be
proportionately  adjusted  for any  increase or decrease in the number of issued
shares of Common Stock resulting from a stock split,  reverse stock split, stock
dividend,  combination  or  reclassification  of the Common Stock,  or any other
increase  or decrease in the number of issued  shares of Common  Stock  effected
without  receipt  of  consideration  by the  Company;  provided,  however,  that
conversion of any  convertible  securities of the Company shall not be deemed to
have been  "effected  without  receipt of  consideration."  Except as  expressly
provided herein,  no issuance by the Company of shares of stock of any class, or
securities  convertible into shares of stock of any class,  shall affect, and no
adjustment by reason  thereof shall be made with respect to, the number or price
of shares of Common Stock subject to a Warrant.

     In the event of the proposed dissolution or liquidation of the Company, the
Board shall notify the Holder at least  fifteen (15) days prior to such proposed
action.  To the extent it has not been  previously  exercised,  the Warrant will
terminate  immediately prior to the consummation of such proposed action. In the
event  of a  merger  or  consolidation  of the  Company  with  or  into  another
corporation  or the sale of all or  substantially  all of the  Company's  assets
(hereinafter, a "merger"), the Warrant shall be assumed or an equivalent warrant
shall be substituted by such successor  corporation or a parent or subsidiary of
such successor  corporation.  In the event that such successor  corporation does
not agree to assume the Warrant or to  substitute  an  equivalent  warrant,  the
Board shall, in lieu of such assumption or substitution,  provide for the Holder
to have the  right to  exercise  the  Warrant  as to all of the  Warrant  Stock,
including Shares as to which the Warrant would not otherwise be exercisable.  If
the  Board  makes  a  Warrant  fully   exercisable  in  lieu  of  assumption  or
substitution  in the event of a merger,  the Board shall  notify the Holder that
the Warrant  shall be fully  exercisable  for a period of fifteen (15) days from
the date of such notice,  and the Warrant will  terminate upon the expiration of
such period. For the purposes of this paragraph, the Warrant shall be considered
assumed if, following the merger, the Warrant or

                                      -4-
<PAGE>

right  confers  the right to  purchase,  for each Share of stock  subject to the
Warrant immediately prior to the merger, the consideration (whether stock, cash,
or other  securities  or  property)  received in the merger by holders of Common
Stock for each  Share  held on the  effective  date of the  transaction  (and if
holders were offered a choice of consideration, the type of consideration chosen
by the holders of a majority of the outstanding Shares); provided, however, that
if such consideration  received in the merger was not solely common stock of the
successor  corporation  or its  Parent,  the Board may,  with the consent of the
successor  corporation and the participant,  provide for the consideration to be
received  upon the exercise of the Warrant,  for each Share of stock  subject to
the Warrant,  to be solely  common  stock of the  successor  corporation  or its
Parent  equal in Fair Market  Value to the per share  consideration  received by
holders of Common Stock in the merger or sale of assets.

     10.  Repurchase  Rights of the  Company.  The Holder  understands  that the
          ----------------------------------
Company has the option to  repurchase  any Shares issued by the Company upon the
exercise  of any  portion  of  this  Agreement,  provided,  however,  that  such
issuances  were made pursuant to the exercise of Warrants prior to the effective
date of the  Company's  initial  underwritten  public  offering of the Company's
securities.  Such  repurchases  shall be at the Fair Market  Value of the Shares
repurchased as of the date on which the Company exercises such option.

     11.  Taxation  Upon  Exercise of Warrant.  Holder  understands  that,  upon
          -----------------------------------
exercise of this Warrant,  Holder will  recognize  income for tax purposes in an
amount  equal to the excess of the then Fair Market Value of the Shares over the
exercise  price.  Holder hereby  agrees to notify the Company in writing  within
thirty (30) days after the date of any such  disposition.  Upon a resale of such
Shares by the Holder,  any difference between the sale price and the Fair Market
Value of the Shares on the date of exercise  of the  Warrant  will be treated as
capital gain or loss.

     12.  Tax Consequences.  The Holder  understands  that any of the  foregoing
          ----------------
references to taxation are based on federal income tax laws and  regulations now
in effect.  The Holder has  reviewed  with the  Holder's  own tax  advisors  the
federal,   state,  local  and  foreign  tax  consequences  of  the  transactions
contemplated  by this  Agreement.  The Holder is relying solely on such advisors
and  not on any  statements  or  representations  of the  Company  or any of its
agents.  The Holder  understands  that the Holder (and not the Company) shall be
responsible for the Holder's own tax liability that may arise as a result of the
transactions contemplated by this Agreement.

DATED:  October 1, 1999
        ---------------

                                    SENESCO TECHNOLOGIES, INC.

                                    By:
                                       ----------------------------------
                                       Sascha P. Fedyszyn, Vice President

                                      -5-
<PAGE>

      HOLDER  ACKNOWLEDGES  AND  AGREES  THAT  THIS  WARRANT,  THE  TRANSACTIONS
CONTEMPLATED  HEREUNDER  AND  THE  VESTING  SCHEDULE  SET  FORTH  HEREIN  DO NOT
CONSTITUTE AN EXPRESS OR IMPLIED PROMISE OF CONTINUED ENGAGEMENT AS A CONSULTANT
FOR THE VESTING PERIOD,  FOR ANY PERIOD, OR AT ALL, AND SHALL NOT INTERFERE WITH
HOLDER'S RIGHT OR THE COMPANY'S  RIGHT TO TERMINATE  CONSULTING  RELATIONSHIP AT
ANY TIME, WITH OR WITHOUT CAUSE.

      Holder has reviewed  this Warrant  Agreement in its  entirety,  has had an
opportunity  to obtain the advice of counsel  prior to  executing  this  Warrant
Agreement and fully understands all provisions of this Warrant Agreement. Holder
agrees to notify the Company upon any change in the residence  address indicated
below.

Dated:
      -------------------

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

                                    Name:
                                         ---------------------------------------

                                    Residence Address:

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

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

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

                                    Social Security No.
                                                       -------------------------

<PAGE>

                                    EXHIBIT A

                          NOTICE OF EXERCISE OF WARRANT

TO:

FROM:

DATE:

RE:   Exercise of Warrant

      I hereby  exercise  my Warrant to purchase                shares of Common
                                                 --------------
Stock at  $              per  share  (total  exercise  price of  $            ),
           ------------                                           ------------
effective  today's date. This notice is given in accordance with the terms of my
Warrant Agreement dated          ,  19    .  The warrant price and vested amount
                        ---------     ----
is in accordance with Sections 2 and 3 of the Warrant Agreement.

      Attached is a check  payable to Senesco  Technologies,  Inc. for the total
exercise  price of the shares  being  purchased,  if  applicable,  or such other
method of  payment  as  provided  by  Section 5 of the  Warrant  Agreement.  The
undersigned  confirms  the  representations  made in  Section  4 of the  Warrant
Agreement.

            Please prepare the stock certificate in the following name(s):

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

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

      If the stock is to be registered in a name other than your name, please so
advise the Company.  The Warrant Agreement  requires the Company's  approval for
registration in a name other than your name and requires certain agreements from
any joint owner.

                                   Sincerely,

                                   ---------------------------------------------
                                   (Signature)

                                   ---------------------------------------------
                                   (Print or Type Name)

Letter and consideration
received on                   , 20  .
            -----------------     --

By:
   --------------------------THE SECURITY  REPRESENTED BY THIS  CERTIFICATE  HAS BEEN ACQUIRED FOR INVESTMENT
AND NOT WITH A VIEW TO, OR IN CONNECTION WITH, THE SALE OR DISTRIBUTION THEREOF.
NO SUCH SALE OR DISPOSITION  MAY BE EFFECTED  WITHOUT AN EFFECTIVE  REGISTRATION
STATEMENT  RELATED THERETO OR AN OPINION OF COUNSEL  SATISFACTORY TO THE COMPANY
THAT SUCH REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933.

                  WARRANT TO PURCHASE SHARES OF COMMON STOCK
                          OF SENESCO TECHNOLOGIES, INC.

                                                     DATED:  DECEMBER 15, 1999

      In  connection  with  that  certain  Investor  Relations   Agreement  (the
"Investor Relations Agreement"), made by and between the Company and the Holder,
dated as of the date hereof, this certifies that Strategic Growth International,
Inc. (the "Holder"),  for value received, is entitled,  subject to the terms set
forth below, to purchase from Senesco Technologies, Inc., a Delaware corporation
(the "Company"),  Three Hundred Thousand  (300,000) fully paid and nonassessable
shares (the "Warrant  Shares"),  on a post-Stock  Split  adjusted  basis ("Stock
Split" is defined as the two-for-one forward stock split of the Company's Common
Stock effective October 25, 1999), of the Company's common stock, $.01 par value
(the "Common Stock"), at a price of $3.50 per share (the "Exercise Price").

     1.  Exercise  Price.  The Exercise  Price is $3.50 for each share of Common
         ---------------
Stock,  which is the Fair  Market  Value per  share of Common  Stock on the date
hereof,  as  determined  by the Board.  Fair Market Value shall mean the closing
price of the Company's  Common Stock as reported on the NASD OTC Bulletin Board,
Nasdaq National Market, Nasdaq SmallCap Market, or such other stock exchange.

     2.  Exercise of Warrant.  This Warrant shall be exercisable during its term
         -------------------
as follows:

     (i) Right to Exercise
         -----------------

          (a) Subject to subsections  3(i)(b), (c) and (d) below, shares subject
     to this Warrant shall become  exercisable based upon the following schedule
     until all of such shares are exercisable:

                   Vesting Period               Number of Shares Exercisable
                   --------------               ----------------------------
                 December 15, 1999                       100,000
                   June 15, 2000                          66,666
                 December 15, 2000                        66,667
                   June 15, 2001                          66,667

          (b) This Warrant may not be exercised for a fraction of a Share.

<PAGE>

          (c) In no event  may  this  Warrant  be  exercised  after  the date of
     expiration of the term of this Warrant as set forth in Section 8 below.

          (d) Notwithstanding the foregoing, if the Investor Relations Agreement
     is  terminated  in accordance  with the terms of such  agreement,  then the
     Company  will have the right to  rescind  any  remaining  unvested  Warrant
     Shares.

     (ii) Method of  Exercise.  This  Warrant  shall be  exercisable  by written
          -------------------
notice in the form  attached  as Exhibit A, which  shall  state the  election to
exercise  the  Warrant,  the number of Shares in respect of which the Warrant is
being  exercised,  and  such  other  representations  and  agreements  as to the
holder's investment intent with respect to such shares of Common Stock as may be
required by the Company. Such written notice shall be signed by Holder and shall
be delivered in person or by certified mail to the President, Secretary or Chief
Financial  Officer of the Company or such other agent  designated  in writing by
the Company.  The written notice shall be accompanied by payment of the exercise
price.  This Warrant shall be deemed to be exercised upon receipt by the Company
of such written notice accompanied by the exercise price. Until the issuance (as
evidenced  by the  appropriate  entry on the books of the  Company  or of a duly
authorized  transfer agent of the Company) of the stock  certificate  evidencing
such  Shares,  no right to vote or receive  dividends  or any other  rights as a
shareholder shall exist with respect to the Warrant Stock,  notwithstanding  the
exercise of the  Warrant.  The Company  shall issue (or cause to be issued) such
stock certificate promptly upon exercise of the Warrant.

            No  shares  will be issued  pursuant  to the  exercise  of a Warrant
unless such issuance and such exercise shall comply with all relevant provisions
of law and the requirements of any stock exchange upon which the Shares may then
be listed. Assuming such compliance, for income tax purposes the Shares shall be
considered  transferred  to the  Holder  on the date on  which  the  Warrant  is
exercised with respect to such Shares.

     4. Investment Representations; Restrictions on Transfer.
        ----------------------------------------------------

     (i) By receipt of this  Warrant,  by its  execution  and by its exercise in
whole or in part, Holder represents to the Company the following:

          (a) Holder understands that this Warrant and any Shares purchased upon
     its exercise are securities, the issuance of which requires compliance with
     federal and state securities laws.

          (b) Holder is aware of the  Company's  business  affairs and financial
     condition  and has  acquired  sufficient  information  about the Company to
     reach an informed  and  knowledgeable  decision to acquire the  securities.
     Holder is  acquiring  these  securities  for  investment  for  Holder's own
     account only and not with a view to, or for resale in connection  with, any
     "distribution" thereof within the meaning of the Securities Act of 1933, as
     amended (the "Securities Act").

                                      -2-
<PAGE>

          (c) Holder acknowledges and understands that the securities constitute
     "restricted   securities"  under  the  Securities  Act  and  must  be  held
     indefinitely  unless they are subsequently  registered under the Securities
     Act or an exemption  from such  registration  is available.  Holder further
     acknowledges  and  understands  that the Company is under no  obligation to
     register the securities. Holder understands that the certificate evidencing
     the securities will be imprinted with a legend which prohibits the transfer
     of the securities  unless they are registered or such  registration  is not
     required  in the  opinion of counsel  satisfactory  to the  Company and any
     other legend required under applicable state securities laws.

          (d) Holder is familiar  with the  provisions of Rule 701 and Rule 144,
     each  promulgated  under the Securities Act,  which,  in substance,  permit
     limited  public resale of  "restricted  securities"  acquired,  directly or
     indirectly,  from the issuer thereof,  in a non-public  offering subject to
     the  satisfaction  of certain  conditions.  Rule 701  provides  that if the
     issuer  qualifies  under Rule 701 at the time of exercise of the Warrant by
     the  Holder,  such  exercise  will be exempt  from  registration  under the
     Securities  Act.  In the event the  Company  later  becomes  subject to the
     reporting  requirements  of Section 13 or 15(d) of the Securities  Exchange
     Act of 1934,  ninety (90) days thereafter the securities  exempt under Rule
     701 may be resold, subject to the satisfaction of certain of the conditions
     specified by Rule 144,  including  among other  things:  (1) the sale being
     made  through  a broker  in an  unsolicited  "broker's  transaction"  or in
     transactions  directly  with a market maker (as said term is defined  under
     the Securities Exchange Act of 1934); and, in the case of an affiliate, (2)
     the availability of certain public  information about the Company,  and the
     amount of securities being sold during any three-month period not exceeding
     the limitations  specified in Rule 144(e),  if applicable.  Notwithstanding
     this  paragraph  4(i)(d),   the  Holder  acknowledges  and  agrees  to  the
     restrictions set forth in paragraph 4(ii) below.

          In the event that the Company  does not qualify  under Rule 701 at the
     time of  exercise  of the  Warrant,  then the  securities  may be resold in
     certain limited  circumstances subject to the provisions of Rule 144, which
     requires  among  other  things:  (1) the  availability  of  certain  public
     information  about the Company;  (2) the resale  occurring not earlier than
     the time period  prescribed by Rule 144 after the party has purchased,  and
     made full payment for, within the meaning of Rule 144, the securities to be
     sold; and (3) in the case of an affiliate,  or of a  non-affiliate  who has
     held the securities  less than the time period  prescribed by Rule 144, the
     sale being made through a broker in an unsolicited  "broker's  transaction"
     or in  transactions  directly  with a market maker (as said term is defined
     under the  Securities  Exchange  Act of 1934) and the amount of  securities
     being  sold  during any three  month  period not  exceeding  the  specified
     limitations stated therein, if applicable.

                                      -3-
<PAGE>

     (ii) Holder agrees,  in connection with an underwritten  public offering of
the Company's  securities,  (1) not to sell, make short sale of, loan, grant any
options for the purchase of, or otherwise  dispose of any shares of Common Stock
of the  Company  held  by  Holder  (other  than  those  shares  included  in the
registration)  without the prior written  consent of the  underwriters  managing
such  underwritten  public offering of the Company's  securities for a period of
one hundred eighty (180) days from the effective date of such  registration (the
"Lock Up Period"),  and (2) further  agrees to execute any agreement  reflecting
clause (1) above,  or extending  the Lock Up Period,  as may be requested by the
underwriters at the time of the public offering.

     5.  Method of Payment.  Payment of the exercise price shall be made by cash
         -----------------
or check.

     6.  Restrictions  on  Exercise.  This  Warrant may not be  exercised if the
         --------------------------
issuance  of such  Shares  upon  such  exercise  or the  method  of  payment  of
consideration  for such shares would  constitute  a violation of any  applicable
federal or state securities or other law or regulation, including any rule under
the Code of Federal  Regulations as promulgated by the Federal Reserve Board. As
a condition to the exercise of this Warrant,  the Company may require  Holder to
make any  representation  and  warranty to the Company as may be required by any
applicable law or regulation.

     7.  Non-Transferability of Warrant.  This Warrant may not be transferred in
         ------------------------------
any manner other than by will or by the laws of descent or distribution  and may
be  exercised  during the  lifetime of Holder only by Holder.  The terms of this
Warrant shall be binding upon the executors,  administrators,  heirs, successors
and assigns of Holder.

     8.  Term of Warrant.  This Warrant may not be exercised more than ten years
         ---------------
from the date of grant of this  Warrant,  and may be exercised  during such term
only in accordance with the terms of this Warrant Agreement.

     9.  Adjustments  Upon Changes in  Capitalization  or Merger.  The number of
         -------------------------------------------------------
shares  of  Common  Stock   covered  by  each   outstanding   Warrant  shall  be
proportionately  adjusted  for any  increase or decrease in the number of issued
shares of Common Stock resulting from a stock split,  reverse stock split, stock
dividend,  combination  or  reclassification  of the Common Stock,  or any other
increase  or decrease in the number of issued  shares of Common  Stock  effected
without  receipt  of  consideration  by the  Company;  provided,  however,  that
conversion of any  convertible  securities of the Company shall not be deemed to
have been  "effected  without  receipt of  consideration."  Except as  expressly
provided herein,  no issuance by the Company of shares of stock of any class, or
securities  convertible into shares of stock of any class,  shall affect, and no
adjustment by reason  thereof shall be made with respect to, the number or price
of shares of Common Stock subject to a Warrant.

                                      -4-
<PAGE>

     In the event of the proposed dissolution or liquidation of the Company, the
Board shall notify the Holder at least  fifteen (15) days prior to such proposed
action.  To the extent it has not been  previously  exercised,  the Warrant will
terminate  immediately prior to the consummation of such proposed action. In the
event  of a  merger  or  consolidation  of the  Company  with  or  into  another
corporation  or the sale of all or  substantially  all of the  Company's  assets
(hereinafter, a "merger"), the Warrant shall be assumed or an equivalent warrant
shall be substituted by such successor  corporation or a parent or subsidiary of
such successor  corporation.  In the event that such successor  corporation does
not agree to assume the Warrant or to  substitute  an  equivalent  warrant,  the
Board shall, in lieu of such assumption or substitution,  provide for the Holder
to have the  right to  exercise  the  Warrant  as to all of the  Warrant  Stock,
including Shares as to which the Warrant would not otherwise be exercisable.  If
the  Board  makes  a  Warrant  fully   exercisable  in  lieu  of  assumption  or
substitution  in the event of a merger,  the Board shall  notify the Holder that
the Warrant  shall be fully  exercisable  for a period of fifteen (15) days from
the date of such notice,  and the Warrant will  terminate upon the expiration of
such period. For the purposes of this paragraph, the Warrant shall be considered
assumed  if,  following  the merger,  the Warrant or right  confers the right to
purchase,  for each Share of stock subject to the Warrant  immediately  prior to
the merger,  the  consideration  (whether  stock,  cash, or other  securities or
property)  received in the merger by holders of Common Stock for each Share held
on the effective date of the  transaction  (and if holders were offered a choice
of consideration,  the type of consideration chosen by the holders of a majority
of the  outstanding  Shares);  provided,  however,  that if  such  consideration
received in the merger was not solely common stock of the successor  corporation
or its Parent, the Board may, with the consent of the successor  corporation and
the participant,  provide for the consideration to be received upon the exercise
of the Warrant,  for each Share of stock  subject to the  Warrant,  to be solely
common  stock of the  successor  corporation  or its Parent equal in Fair Market
Value to the per share consideration  received by holders of Common Stock in the
merger or sale of assets.

     10.  Repurchase  Rights of the  Company.  The Holder  understands  that the
          ----------------------------------
Company has the option to  repurchase  any Shares issued by the Company upon the
exercise  of any  portion  of  this  Agreement,  provided,  however,  that  such
issuances  were made pursuant to the exercise of Warrants prior to the effective
date of the  Company's  initial  underwritten  public  offering of the Company's
securities.  Such  repurchases  shall be at the Fair Market  Value of the Shares
repurchased as of the date on which the Company exercises such option.

     11.  Taxation  Upon  Exercise of Warrant.  Holder  understands  that,  upon
          -----------------------------------
exercise of this Warrant,  Holder will  recognize  income for tax purposes in an
amount  equal to the excess of the then Fair Market Value of the Shares over the
exercise  price.  Holder hereby  agrees to notify the Company in writing  within
thirty (30) days after the date of any such  disposition.  Upon a resale of such
Shares by the Holder,  any difference between the sale price and the Fair Market
Value of the Shares on the date of exercise  of the  Warrant  will be treated as
capital gain or loss.

                                      -5-
<PAGE>

     12. Tax  Consequences.  The Holder  understands  that any of the  foregoing
         -----------------
references to taxation are based on federal income tax laws and  regulations now
in effect.  The Holder has  reviewed  with the  Holder's  own tax  advisors  the
federal,   state,  local  and  foreign  tax  consequences  of  the  transactions
contemplated  by this  Agreement.  The Holder is relying solely on such advisors
and  not on any  statements  or  representations  of the  Company  or any of its
agents.  The Holder  understands  that the Holder (and not the Company) shall be
responsible for the Holder's own tax liability that may arise as a result of the
transactions contemplated by this Agreement.

DATED:  December 15, 1999
        -----------------

                                    SENESCO TECHNOLOGIES, INC.

                                    By:
                                        ---------------------------------------
                                        Sascha P. Fedyszyn
                                        Vice President - Corporate Development

                                      -6-
<PAGE>

      HOLDER  ACKNOWLEDGES  AND  AGREES  THAT  THIS  WARRANT,  THE  TRANSACTIONS
CONTEMPLATED  HEREUNDER  AND  THE  VESTING  SCHEDULE  SET  FORTH  HEREIN  DO NOT
CONSTITUTE AN EXPRESS OR IMPLIED PROMISE OF CONTINUED ENGAGEMENT AS A CONSULTANT
FOR THE VESTING PERIOD,  FOR ANY PERIOD, OR AT ALL, AND SHALL NOT INTERFERE WITH
HOLDER'S RIGHT OR THE COMPANY'S  RIGHT TO TERMINATE  CONSULTING  RELATIONSHIP AT
ANY TIME, WITH OR WITHOUT CAUSE.

      Holder has reviewed  this Warrant  Agreement in its  entirety,  has had an
opportunity  to obtain the advice of counsel  prior to  executing  this  Warrant
Agreement and fully understands all provisions of this Warrant Agreement. Holder
agrees to notify the Company upon any change in the residence  address indicated
below.

Dated:
      -------------------

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

                                    Name:
                                         ---------------------------------------

                                    Residence Address:

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

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

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

                                    Social Security No.
                                                       -------------------------

<PAGE>

                                    EXHIBIT A

                          NOTICE OF EXERCISE OF WARRANT

TO:

FROM:

DATE:

RE:   Exercise of Warrant

      I hereby  exercise  my Warrant to purchase                shares of Common
                                                 --------------
Stock at  $              per  share  (total  exercise  price of  $            ),
           ------------                                           ------------
effective  today's date. This notice is given in accordance with the terms of my
Warrant Agreement dated          ,  19    .  The warrant price and vested amount
                        ---------     ----
is in accordance with Sections 2 and 3 of the Warrant Agreement.

      Attached is a check  payable to Senesco  Technologies,  Inc. for the total
exercise  price of the shares  being  purchased,  if  applicable,  or such other
method of  payment  as  provided  by  Section 5 of the  Warrant  Agreement.  The
undersigned  confirms  the  representations  made in  Section  4 of the  Warrant
Agreement.

            Please prepare the stock certificate in the following name(s):

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

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

      If the stock is to be registered in a name other than your name, please so
advise the Company.  The Warrant Agreement  requires the Company's  approval for
registration in a name other than your name and requires certain agreements from
any joint owner.

                                   Sincerely,

                                   ---------------------------------------------
                                   (Signature)

                                   ---------------------------------------------
                                   (Print or Type Name)

Letter and consideration
received on                   , 20  .
            -----------------     --

By:
   --------------------------

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