NEET 2014 Biology question

Dr. F. 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?

(1)It made possible the isolation and exact identification of auxinCorrect
(2)It is the basis for quantitative determination of small amounts of growth-promoting substances
(3)It supports the hypothesis that IAA is auxin
(4)It demonstrated polar movement of auxins

Answer: (1)

Solution

F.W. Went (1928) cut off the tips of Avena (oat) coleoptiles and kept them on agar blocks for about an hour, so that the growth-promoting substance diffused out of the tips into the agar. When such an agar block was placed asymmetrically on one side of a decapitated coleoptile stump, the stump bent (curved away from

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Question ID VK-091582