Which of the following is not an auxin?

IAA

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IBA

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Zeatin

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NAA

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Solution

The correct option is C Zeatin
Zeatin is the plant hormone belongs to cytokinin but not to auxin.
IAA or indole acetic acid is a natural auxin.
IBA or indole butyric acid and NAA or nepthalene acetic acid are synthetic auxin. Thus, the correct answer is option C.

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