Indole acetic acid is a

Chemical found in the retina of nocturnal animals

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Pesticide

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Good fertilizer

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Naturally occurring auxin

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Solution

The correct option is D Naturally occurring auxin
Indole-3-acetic acid (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.
So, the correct option is D. ( Naturally occuring auxin )

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