Naturally occurring auxin is

NAA

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2, 4-D

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IAA

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Solution

The correct option is D IAA
Auxin is a plant hormone that performs various physiological processes in plant. IAA (indoleacetic acid) is a naturally occurring auxin in plant. NAA (naphthaleneacetic acid) and IBA (indolebutyric acid) are synthetic auxin hormones. These are commonly applied in various processes like to stimulate root initiation. MH (maleic hydrazide) is a synthetic hormone that act as growth regulator.
Thus, the correct answer is option D.

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