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Which of the following is NOT a naturally occurring auxin?

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Which of the following is NOT a naturally occurring auxin?

(a) Indole 3-acetic acid (IAA)

(b) Indole 3-butyric acid (IBA)

(c) Phenyl acetic acid (PAA)

(d) 2,4-D

I had been asked this question in my homework.

The doubt is from Plant Hormones topic in chapter Plant Physiology of Life Sciences

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Right option is (d) 2,4-D

For explanation: 2, 4-D is an organic compound and is known as synthetic auxin which is marketed as a herbicide.

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