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VMMC VMMC Medical Solved Paper-2010

  • question_answer
    Identify the correct statement from the following. I. Accumulation of K+ ions in the guard cells does not require energy. II.            A high pH favours stomatal opening. III.           Movement of chloride ions into the guard cells in the response to the electrical differential created by K+ ions. IV. With the entry of several K+ ions and chloride ions, the water potential of guard cells increases. The correct combination is

    A) I and III                                

    B) I and II                 

    C) II and III                               

    D)        III and IV

    Correct Answer: C

    Solution :

    In the light, the pH of guard cells becomes increased due to consumption of carbon dioxide in the process of photosynthesis. Guard cells receive \[{{K}^{+}}\] ions from subsidiary cells. This decreases the water potential of guard cells and leads to migration of water from subsidiary cells to guard cells. Uptake of \[{{K}^{+}}\] ions is also balanced by \[C{{l}^{-}}\] ions.


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