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    Question

    The opening and closing of the stomatal pores is a

    function of the 
    A Guard cells Correct Answer Incorrect Answer
    B Chloroplast Correct Answer Incorrect Answer
    C Xylem Correct Answer Incorrect Answer
    D Phloem Correct Answer Incorrect Answer

    Solution

    The opening and closing of the pores is a function of the guard cells. They swell when water flows into them, causing the stomatal pore to open and likewise, the pore closes if the guard cells shrink. Hence, option A is correct.

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