The primary precursor of IAA is

Phenyl alanine

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Tyrosine

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Tryptophan

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Leucine

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Solution

The correct option is C Tryptophan
Auxin is a growth hormone which shows a great response towards phototropism. It is naturally found in growing tips of root and shoot. It is responsible for cell growth, cell division and cell expansion. Tryptophan is the precursor of auxin.
So, the correct answer is option C.

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