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      Question

      Which amino acid serves as the primary biological

      precursor for the synthesis of ethylene in plants?
      A Tryptophan Correct Answer Incorrect Answer
      B Methionine Correct Answer Incorrect Answer
      C ABA Correct Answer Incorrect Answer
      D IAA Correct Answer Incorrect Answer

      Solution

      Ethylene is synthesized via the Yang Cycle, where Methionine is converted into S-adenosylmethionine (SAM) and then to ACC. This pathway is critical for regulating fruit ripening and senescence.

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