Which of the plant growth regulator was first isolated from human urine?

Auxin

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Cytokinin

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Ethylene

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None of the above

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Solution

The correct option is D Auxin
The auxins are the phytohormone which was first isolated from the human urine. The hormone promotes the growth of the plant especially in the region of the tips. The application of the hormone promotes the growth of shoot in the callus culture.
Thus, the correct answer is option A.

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