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B
Auxin b
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C
Auxin a
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D
None of the above
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Solution
The correct option is B IAA 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. Chemically IAA is a carboxylic acid in which the carboxylic group is attached through a methyl groupto the C-3 position of an indole ring.