Which one of the following is not a synthetic auxin?

2, 4-D

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IBA

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IPA

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IAA

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Solution

The correct option is D IAA
Auxins are growth promoting phytohormones. Indoleacetic acid (IAA) is a natural plant auxin. 2, 4-D and 2, 4, 5-T are artificial auxins used as weedicides. Naphthalene acetic acid (NAA) is also an artificial auxin widely used in agriculture.
Thus, the correct answer is option D.

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