Which of the following is not a natural auxin?

Indole acetic acid

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Naphthalene acetic acid

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Indole acetaldehyde

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Indole ethanol

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Solution

The correct option is B Naphthalene acetic acid
Auxin is a plant hormone. It acts as plant growth promoter. IAA (indoleacetic acid) is the most common naturally occurring auxin found in plants. Several other natural auxins found in plants are indole ethanol, indole acetaldehyde, indole acetonitrile, phenylacetic acid. NAA (Naphthaleneacetic acid) is a synthetic auxin used as rooting agent.
Thus, the correct answer is option B.

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