A well known naturally occurring auxin is or A natural growth regulator (hormone) is ........................
A
2, 4 - D
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B
Indole acetic acid
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C
NAA
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D
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.