IAA was first isolated from

Corn germ oil

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Gibberella

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Human urine

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Rhizopus

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Solution

The correct option is A Corn germ oil
IAA (indoleacetic acid) is type of auxin, plant horme. It was first isolated from human urine by Kogl and Haagen. It is formed in liver by the breakdown of serotonin. It performs similar function in human as in plant. Later, it was isolated from higher plants.
Thus, the correct answer is option C.

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