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    Question

    What is the primary role of abscisic acid (ABA) in

    stomatal movement?
    A Promotes stomatal opening Correct Answer Incorrect Answer
    B Inhibits K+ uptake in guard cells Correct Answer Incorrect Answer
    C Increases osmotic pressure Correct Answer Incorrect Answer
    D Facilitates photosynthesis Correct Answer Incorrect Answer
    E Activates guard cell chloroplasts Correct Answer Incorrect Answer

    Solution

    ABA inhibits K+ uptake, causing stomatal closure.

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