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      Question

      ______ activates a proton pump at the guard cell plasma

      membrane. 
      A Blue light Correct Answer Incorrect Answer
      B Red light Correct Answer Incorrect Answer
      C UV rays Correct Answer Incorrect Answer
      D None of these Correct Answer Incorrect Answer

      Solution

      Blue light is known to activate proton pumps in guard cell plasma membranes, resulting in stomatal opening.

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