A well known naturally occurring auxin is or A natural growth regulator (hormone) is ........................

2, 4 - D

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Indole acetic acid

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NAA

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Maleic hydrazide

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Solution

The correct option is A Indole acetic acid
Indole - 3 - acetic acid 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.

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