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      Question

      What is the main precursor of the plant hormone

      ethylene?
      A Tryptophan Correct Answer Incorrect Answer
      B Acetate Correct Answer Incorrect Answer
      C Methionine Correct Answer Incorrect Answer
      D Adenine Correct Answer Incorrect Answer

      Solution

      Methionine is the precursor of ethylene, which is synthesized in ripening fruits and senescing tissues. Ethylene regulates processes like fruit ripening and leaf abscission.

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