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    Question

    The precursor of auxin is

    _____
    A Tryptophan Correct Answer Incorrect Answer
    B Carotene Correct Answer Incorrect Answer
    C Methionine Correct Answer Incorrect Answer
    D Lycopene Correct Answer Incorrect Answer
    E Acetic acid Correct Answer Incorrect Answer

    Solution

    Tryptophan is known as the┬а precursor for auxin biosynthesis and it has been demonstrated that feeding plants with tryptophan leads to the production of IAA.

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