Q. F.W. Went noted that if coleoptile tips were removed and placed on agar for one hour, the agar would produce a bending when placed on one side of freshly-cut coleoptile stumps. Of what significance is this experiment ?
A) It made possible the isolation and exact identification of auxin
B) It is the basis for quantitative determination of small amounts of growth-promoting substances
C) It supports the hypothesis that IAA is auxin
D) It demonstrated polar movement of auxins
Explanation
[Solution] Went's agar-block experiment led to the isolation of auxin from coleoptile tips; the key gives (1). Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.