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Genetics and Plant Breeding
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Zinc is essential for

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Correct Answer: Option B
Zinc is essential for biosynthesis of 3-IAA in plants.
Zinc activates tryptophan synthetase, which regulates the synthesis of tryptophan, involved in the biosynthesis of indoleacetic acid (IAA).
Indole-3-acetic acid (IAA, 3-IAA) is the most common naturally occurring plant hormone of the auxin class. It is the best-known of the auxins and has been the subject of extensive studies by plant physiologists. IAA is a derivative of indole, containing a carboxymethyl substituent.
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