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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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