Dr. F. Went noted that if coleoptile tips wer | vedclass

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(B) The experiment conducted by $F.W. Went$ is known as the $Avena$ curvature test.This experiment demonstrated that the substance responsible for gro

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It is the basis for quantitative determination of small amounts of growth-promoting substances.

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(B) The experiment conducted by $F.W. Went$ is known as the $Avena$ curvature test.This experiment demonstrated that the substance responsible for growth (auxin) diffuses from the coleoptile tip into the agar block.By placing the agar block on one side of a decapitated coleoptile,the differential growth caused by the auxin leads to bending.This method allows for the quantitative measurement of the concentration of growth-promoting substances (auxins) based on the degree of curvature produced,making it the basis for the bioassay of auxins.

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?

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