IAA was isolated by

Kogl and Erxleben

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Kogl and Haagen Smit

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Erxleben and Haagen Smit

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Kogl, Darwin and Haagen Smit

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Solution

The correct option is B Kogl and Haagen Smit
Kogl and Smit isolated auxin (indoleacetic acid) from human urine. Chemically, it was auxentriolic acid. Kogl, Erxleben and Smit isolated auxin b (auxenolonic acid) from corn germ oil. Later, they also isolated heteroauxin from human urine which was indole-3-acetic acid.
Thus, the correct answer is option B.

Suggest Corrections

List-I	List-II
A. Hele Shaw Flow	1. Surface equal pressure
B. Stoke's law	2. Settling of fine particles
C. Hagen-Poiseuille flow	3. Laminar flow between parallel plates
D. Pascal's law	4. Laminar flow in tubes