Question

The natural plant hormones were first isolated from .................

• A. Corn germ oil and human urine
• B. Cotton fruit, spinach leaves and rice plants
• C. Avena coleoptile spinach leaves and the fungus gibberella
• D. Human urine and rice seedlings

Answer 1

The correct option is A Corn germ oil and human urine

The natural auxin hormone was first isolated from the urine of a pathological Dutch patient by Kogl and named it auxin- a. Kogl and his colleagues further isolated a similar substance from corn germ oil and named it auxin b. Subsequently, they isolated another auxin from human urine and called it heteroauxin which was identified as IAA. Thus, the correct answer is option A.