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NEET Biology NEET PYQ-Growth and Development Plants

  • question_answer
    Which one of the following generally acts as an antagonist to gibberellins?    [AIPMT (M) 2012]

    A) Zeatin

    B) Ethylene

    C) ABA

    D) IAA

    Correct Answer: C

    Solution :

    [C] Abscisic acid (ABA) is also called stress hormone. It is a mildly acidic growth hormone which functions as a general growth inhibitor by counteractig other hormones (auxin, gibberelliun, cytokinin) or reactions mediated by them. It causes stomatal closure, abscission of flower and fruits while gibberellin helps in opening of stomata and promote development of fruits.


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