BHU PMT BHU PMT (Screening) Solved Paper-2011

  • question_answer
    ABA closes stomata but which hormone encourages them to open?                 

    A)  GA                                        

    B)  Auxin           

    C)  Cytokinin                           

    D)  Ethylene

    Correct Answer: C

    Solution :

                 ABA inhibits the ATP mediated proton K+                         exchange pump thereby closing the stomata. It                is seen that cytokinins can promote stomatal          opening when applied in isolation, and thus can                reduce the stomatal resistance; they can also            antagonise ABA-induced stomatal closure.


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