SENESCO TECHNOLOGIES, INC. Warrant To Purchase Common Stock

(ii) exercise or conversion of the unexercised or unconverted portion of any other securities of the Company beneficially owned by the holder and its affiliates (including, without limitation, any convertible notes or preferred stock) subject to a limitation on conversion or exercise analogous to the limitation contained herein.  Except as set forth in the preceding sentence, for purposes of this paragraph, beneficial ownership shall be calculated in accordance with Section 13(d) of the Securities Exchange Act of 1934, as amended.  For purposes of this Warrant, in determining the number of outstanding shares of Common Stock a holder may rely on the number of outstanding shares of Common Stock as reflected in (1) the Company’s most recent Form 10-Q or Form 10-K, as the case may be, (2) a more recent public announcement by the Company or (3) any other notice by the Company or its transfer agent setting forth the number of shares of Common Stock outstanding.  Upon the written request of any holder, the Company shall promptly, but in no event later than one (1) Business Day following the receipt of such notice, confirm in writing to any such holder the number of shares of Common Stock then outstanding.  In any case, the number of outstanding shares of Common Stock shall be determined after giving effect to the exercise of Warrants (as defined below) by such holder and its affiliates since the date as of which such number of outstanding shares of Common Stock was reported.

Section 1.

(a)           This Warrant is one of the warrants issued pursuant the Engagement Letter and Proposal (“ Letter Agreement ”) dated April 28, 2006, as amended on August 3, 2007 between the Company and the H.C. Wainwright & Co., Inc. or issued in exchange or substitution thereafter or replacement thereof.  Each Capitalized term used, and not otherwise defined herein, shall have the meaning ascribed thereto in the Securities Purchase Agreement (“ Securities Purchase Agreement ”) dated August 1, 2007 between the Company and the Buyers listed on Schedule I thereto..

(b)          Definitions .  The following words and terms as used in this Warrant shall have the following meanings:

(i)                                      “ Approved Stock Plan ” means a stock option plan that has been approved by the Board of Directors of the Company prior to the date of the Securities Purchase Agreement, pursuant to which the Company’s securities may be issued only to any employee, officer or director for services provided to the Company.

(ii)                                   “ Business Day ” means any day other than Saturday, Sunday or other day on which commercial banks in the State of New Jersey are authorized or required by law to remain closed.

(iii)                                “ Closing Bid Price ” means the closing bid price of Common Stock as quoted on the Principal Market (as reported by Bloomberg Financial Markets (“ Bloomberg ”) through its “Volume at Price” function).

(iv)                               “ Common Stock ” means (i) the Company’s common stock, par value $0.01 per share, and (ii) any capital stock into which such Common Stock shall have been changed or any capital stock resulting from a reclassification of such Common Stock.

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(v)                                  “ Debenture(s) ” means the convertible debentures issued pursuant to the Securities Purchase Agreement.

(vi)                               “ Event of Default ” means an event of default under the Securities Purchase Agreement or the Debentures issued in connection therewith.

(vii)                            “ Excluded Securities ” means, (a) shares issued or deemed to have been issued by the Company pursuant to an Approved Stock Plan (b) shares of Common Stock issued or deemed to be issued by the Company upon the conversion, exchange or exercise of any right, option, obligation or security outstanding on the date prior to date of the Securities Purchase Agreement, provided that the terms of such right, option, obligation or security are not amended or otherwise modified on or after the date of the Securities Purchase Agreement, and provided that the conversion price, exchange price, exercise price or other purchase price is not reduced, adjusted or otherwise modified and the number of shares of Common Stock issued or issuable is not increased (whether by operation of, or in accordance with, the relevant governing documents or otherwise) on or after the date of the Securities Purchase Agreement, (c) shares issued in connection with any (i) acquisition by the Company, whether through an acquisition of stock or a merger of any business, assets or technologies, leasing arrangement or any other transaction the primary purpose of which is not to raise equity capital, or (ii) license agreement, consulting agreement, strategic partnership or similar business arrangement, and (d) the shares of Common Stock issued or deemed to be issued by the Company upon conversion of the Debenture or the Warrants.

(viii)                         “ Expiration Date ” means           , 2013.

(ix)                                 “ Issuance Date ” means the date hereof.

(x)                                    “ Options ” means any rights, warrants or options to subscribe for or purchase Common Stock or Convertible Securities.

(xi)                                 “ Person ” means an individual, a limited liability company, a partnership, a joint venture, a corporation, a trust, an unincorporated organization and a government or any department or agency thereof.

(xii)                              “ Primary Market ” means on any of (a) the American Stock Exchange, (b) New York Stock Exchange, (c) the Nasdaq Global Select Market, (d) the Nasdaq Global Market, (e) the Nasdaq Capital Market, or (e) the NASD Over-the-Counter Bulletin Board (“ OTCBB ”).

(xiii)                           “ Securities Act ” means the Securities Act of 1933, as amended.

(xiv)                          “ Warrant ” means this Warrant and all Warrants issued in exchange, transfer or replacement thereof.

(xv)                             “ Warrant Exercise Price ” shall be equal to $0.90.

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(c)           Other Definitional Provisions.

(i)                                      Except as otherwise specified herein, all references herein (A) to the Company shall be deemed to include the Company’s successors and (B) to any applicable law defined or referred to herein shall be deemed references to such applicable law as the same may have been or may be amended or supplemented from time to time.

(ii)                                   When used in this Warrant, the words “ herein ”, “ hereof ”, and “ hereunder ” and words of similar import, shall refer to this Warrant as a whole and not to any provision of this Warrant, and the words “ Section ”, “ Schedule ”, and “ Exhibit ” shall refer to Sections of, and Schedules and Exhibits to, this Warrant unless otherwise specified.

(iii)                                Whenever the context so requires, the neuter gender includes the masculine or feminine, and the singular number includes the plural, and vice versa.

Section 2.                                             Exercise of Warrant .

(a)           Subject to the terms and conditions hereof, this Warrant may be exercised by the holder hereof then registered on the books of the Company, pro rata as hereinafter provided, at any time on any Business Day on or after the opening of business on such Business Day, commencing with the first day after the date hereof, and prior to 11:59 P.M. Eastern Time on the Expiration Date (i) by delivery of a written notice, in the form of the subscription notice attached as Exhibit A hereto (the “ Exercise Notice ”), of such holder’s election to exercise this Warrant, which notice shall specify the number of Warrant Shares to be purchased, payment to the Company of an amount equal to the Warrant Exercise Price(s) applicable to the Warrant Shares being purchased, multiplied by the number of Warrant Shares (at the applicable Warrant Exercise Price) as to which this Warrant is being exercised (plus any applicable issue or transfer taxes) (the “ Aggregate Exercise Price ”) in cash or wire transfer of immediately available funds and the surrender of this Warrant (or an indemnification undertaking with respect to this Warrant in the case of its loss, theft or destruction) to a common carrier for overnight delivery to the Company as soon as practicable following such date (“ Cash Basis ”) or (ii) if at the time of exercise, the Warrant Shares are not subject to an effective registration statement, by delivering an Exercise Notice and in lieu of making payment of the Aggregate Exercise Price in cash or wire transfer, elect instead to receive upon such exercise the “Net Number” of shares of Common Stock determined according to the following formula (the “ Cashless Exercise ”):

For purposes of the foregoing formula:

A = the total number of Warrant Shares with respect to which this Warrant is then being exercised.

B = the Closing Bid Price of the Common Stock on the date of exercise of the Warrant.

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C = the Warrant Exercise Price then in effect for the applicable Warrant Shares at the time of such exercise.

In the event of any exercise of the rights represented by this Warrant in compliance with this Section 2, the Company shall on or before the fifth (5th) Business Day following the date of receipt of the Exercise Notice, the Aggregate Exercise Price and this Warrant (or an indemnification undertaking with respect to this Warrant in the case of its loss, theft or destruction) and the receipt of the representations of the holder specified in Section 6 hereof, if requested by the Company (the “ Exercise Delivery Documents ”), and if the Common Stock is DTC eligible, credit such aggregate number of shares of Common Stock to which the holder shall be entitled to the holder’s or its designee’s balance account with The Depository Trust Company; provided, however, if the holder who submitted the Exercise Notice requested physical delivery of any or all of the Warrant Shares, or, if the Common Stock is not DTC eligible then the Company shall, on or before the fifth (5 th ) Business Day following receipt of the Exercise Delivery Documents, issue and surrender to a common carrier for overnight delivery to the address specified in the Exercise Notice, a certificate, registered in the name of the holder, for the number of shares of Common Stock to which the holder shall be entitled pursuant to such request.  Upon delivery of the Exercise Notice and Aggregate Exercise Price referred to in clause (i) or (ii) above, the holder of this Warrant shall be deemed for all corporate purposes to have become the holder of record of the Warrant Shares with respect to which this Warrant has been exercised.  In the case of a dispute as to the determination of the Warrant Exercise Price, the Closing Bid Price or the arithmetic calculation of the Warrant Shares, the Company shall promptly issue to the holder the number of Warrant Shares that is not disputed and shall submit the disputed determinations or arithmetic calculations to the holder via facsimile within one (1) Business Day of receipt of the holder’s Exercise Notice.

(b)          If the holder and the Company are unable to agree upon the determination of the Warrant Exercise Price or arithmetic calculation of the Warrant Shares within one (1) day of such disputed determination or arithmetic calculation being submitted to the holder, then the Company shall immediately submit via facsimile (i) the disputed determination of the Warrant Exercise Price or the Closing Bid Price to an independent, reputable investment banking firm or (ii) the disputed arithmetic calculation of the Warrant Shares to its independent, outside accountant.  The Company shall cause the investment banking firm or the accountant, as the case may be, to perform the determinations or calculations and notify the Company and the holder of the results no later than forty-eight (48) hours from the time it receives the disputed determinations or calculations.  Such investment banking firm’s or accountant’s determination or calculation, as the case may be, shall be deemed conclusive absent manifest error.

(c)           Unless the rights represented by this Warrant shall have expired or shall have been fully exercised, the Company shall, as soon as practicable and in no event later than five (5) Business Days after any exercise and at its own expense, issue a new Warrant identical in all respects to this Warrant exercised except it shall represent rights to purchase the number of Warrant Shares purchasable immediately prior to such exercise under this Warrant exercised, less the number of Warrant Shares with respect to which such Warrant is exercised.

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(d)          No fractional Warrant Shares are to be issued upon any pro rata exercise of this Warrant, but rather the number of Warrant Shares issued upon such exercise of this Warrant shall be rounded up or down to the nearest whole number.

(e)           RESERVED.

(f)             RESERVED.

Section 3.                                             Covenants as to Common Stock .  The Company hereby covenants and agrees as follows:

(a)           This Warrant is, and any Warrants issued in substitution for or replacement of this Warrant will upon issuance be, duly authorized and validly issued.

(b)          All Warrant Shares which may be issued upon the exercise of the rights represented by this Warrant will, upon issuance, be validly issued, fully paid and nonassessable and free from all taxes, liens and charges with respect to the issue thereof.

(c)           During the period within which the rights represented by this Warrant may be exercised, the Company will at all times have authorized and reserved at least one hundred percent (100%) of the number of shares of Common Stock needed to provide for the exercise of the rights then represented by this Warrant and the par value of said shares will at all times be less than or equal to the applicable Warrant Exercise Price.  If at any time the Company does not have a sufficient number of shares of Common Stock authorized and available, then the Company shall call and hold a special meeting of its stockholders within sixty (60) days of that time for the sole purpose of increasing the number of authorized shares of Common Stock.

(d)          If at any time after the date hereof the Company shall file a registration statement, the Company shall include the Warrant Shares issuable to the holder, pursuant to the terms of this Warrant and shall maintain, so long as any other shares of Common Stock shall be so listed, such listing of all Warrant Shares from time to time issuable upon the exercise of this Warrant; and the Company shall so list on each national securities exchange or automated quotation system, as the case may be, and shall maintain such listing of, any other shares of capital stock of the Company issuable upon the exercise of this Warrant if and so long as any shares of the same class shall be listed on such national securities exchange or automated quotation system.

(e)           The Company will not, by amendment of its Articles of Incorporation or through any reorganization, transfer of assets, consolidation, merger, dissolution, issue or sale of securities, or any other voluntary action, avoid or seek to avoid the observance or performance of any of the terms to be observed or performed by it hereunder, but will at all times in good faith assist in the carrying out of all the provisions of this Warrant and in the taking of all such action as may reasonably be requested by the holder of this Warrant in order to protect the exercise privilege of the holder of this Warrant against dilution or other impairment, consistent with the tenor and purpose of this Warrant.  The Company will not increase the par value of any shares of Common Stock receivable upon the exercise of this Warrant above the Warrant Exercise Price then in effect, and (ii) will take all such actions as may be necessary or appropriate in order that

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the Company may validly and legally issue fully paid and nonassessable shares of Common Stock upon the exercise of this Warrant.

(f)             This Warrant will be binding upon any entity succeeding to the Company by merger, consolidation or acquisition of all or substantially all of the Company’s assets.

Section 4.                                             Taxes .  The Company shall pay any and all taxes, except any applicable withholding, which may be payable with respect to the issuance and delivery of Warrant Shares upon exercise of this Warrant.

Section 5.                                             Warrant Holder Not Deemed a Stockholder .  Except as otherwise specifically provided herein, no holder, as such, of this Warrant shall be entitled to vote or receive dividends or be deemed the holder of shares of capital stock of the Company for any purpose, nor shall anything contained in this Warrant be construed to confer upon the holder hereof, as such, any of the rights of a stockholder of the Company or any right to vote, give or withhold consent to any corporate action (whether any reorganization, issue of stock, reclassification of stock, consolidation, merger, conveyance or otherwise), receive notice of meetings, receive dividends or subscription rights, or otherwise, prior to the issuance to the holder of this Warrant of the Warrant Shares which he or she is then entitled to receive upon the due exercise of this Warrant.  In addition, nothing contained in this Warrant shall be construed as imposing any liabilities on such holder to purchase any securities (upon exercise of this Warrant or otherwise) or as a stockholder of the Company, whether such liabilities are asserted by the Company or by creditors of the Company.  Notwithstanding this Section 5, the Company will provide the holder of this Warrant with copies of the same notices and other information given to the stockholders of the Company generally, contemporaneously with the giving thereof to the stockholders.

Section 6.                                             Representations of Holder .  The holder of this Warrant, by the acceptance hereof, represents that it is acquiring this Warrant and the Warrant Shares for its own account for investment only and not with a view towards, or for resale in connection with, the public sale or distribution of this Warrant or the Warrant Shares, except pursuant to sales registered or exempted under the Securities Act; p