DUMET Medical DUMET Medical Solved Paper-2001

  • question_answer
    Which of the following ion is involved in the closing and opening of stomata?

    A) \[M{{g}^{2+}}\]         

    B) \[N{{a}^{+}}\]

    C) \[F{{e}^{2+}}\]        

    D) \[{{K}^{+}}\]

    Correct Answer: D

    Solution :

    Active \[{{K}^{+}}\] transport theory proposed by Fujino explains that when leaf is exposed to light, malic acid appears in guard cells. This malic acid dissociates into malate and \[{{H}^{+}}\] ions which results in efflux of \[{{H}^{+}}\] ions and influx of \[{{K}^{+}}\]  ions. In dark reverse happen. \[M{{g}^{2+}}\]is involved in chlorophyll formation, growth, metabolism and nodule formation in legumes. \[F{{e}^{2+}}\] is involved in development of chloroplasts, chlorophyll and other pigment, protein synthesis.


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