NEET Biology NEET PYQ-Growth and Development Plants

  • question_answer
    Seed dormancy is due to the: [AIPMT 2002]

    A) ethylene

    B) abscisic acid

    C) IAA

    D) starch

    Correct Answer: B

    Solution :

    [B] Abscisic Acid (ABA) was isolated by Liu and Crans (1961) from mature cotton fruits. The other name dormin is also given to ABA because it induces seed dormancy as well as bud dormancy. Main physiological effects of ABA are: [a] It promotes abscission of leaves, flowers and fruits. [b] It accelerates senescence. [c] It promotes bud dormancy.                  [d] It is a natural growth inhibitors.


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