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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. A
    It made possible the isolation and exact identification of auxin.
  2. B
    It is the basis for quantitative determination of small amounts of growth-promoting substances.
  3. C
    It supports the hypothesis that IAA is auxin.
  4. D
    It demonstrated polar movement of auxins.

Solution & Step-by-step Explanation

The Avena curvature test performed by F.W. Went demonstrated that the effect was due to a chemical (Auxin) diffusing into the agar. This experiment established a bioassay for the quantitative determination of auxin levels based on the degree of curvature produced.
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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?
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.

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