Question

Indole-3-acetic acid called as auxin was first isolated from

• A. Human urine
• B. Corn germ oil
• C. Fusarium
• D. Rhizopus

Answer 1

The correct option is A Human urine

Indole - 3 - acetic acid is the most common, naturally occurring plant hormone of the auxin class. It is the best known of the auxins and has been the subject of extensive studies by plant physiologists. It is the first naturally occurring auxin, which was isolated by Kogl and Haagen-Smit from human urine.

So, the correct answer is option A.