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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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