IAA precursor is

Tryptophan

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Leucine

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Tyrosine

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Phenylalanine

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Solution

The correct option is B Tryptophan
Indole-3-acetic acid (IAA) is the naturally occurring auxin, plant hormone. Plant produces IAA using tryptophan as a precursor. It plays important role in development and growth of plant.
So, the correct answer is 'Tryptophan'

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