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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

    Solution

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

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