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    Question

    “Triple response”, a key reaction of ethylene, is

    characterized by:
    A Plumule hook opening, positive gravitropism and internodal elongation. Correct Answer Incorrect Answer
    B Excessive cytokinesis, negative phototropism and parthenocarpy. Correct Answer Incorrect Answer
    C Inhibition of stem elongation, promotion of lateral swelling of stems, and reduced sensitivity of stems to gravitropic stimulation. Correct Answer Incorrect Answer
    D Fruit ripening, plumule hook opening and negative phototropism. Correct Answer Incorrect Answer

    Solution

    The correct answer is C

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