Which is not a natural plant hormone?

{G A}_{3}

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{G A}_{2}

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I A A

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2, 4 - D

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Solution

The correct option is D $2, 4 - D$
A 2,4-D is a synthetic auxin, a plant hormone. It acts as herbicide. GA $_{3}$ and GA $_{2}$ are types of gibberellin, a natural plant hormones. They regulate plant growth and development. IAA (indoleacetic acid) is a most common natural auxin hormone.
Thus, the correct answer is option D.

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