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The importance of coleoptile tip in photo-tropic curvature was first experimentally confirmed By

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An Intiative by Sri Chaitanya

Boysen-Jenson

Julius von Sachs

Charles Darwin and Francis Darwin

F.W. Went

answer is B.

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Detailed Solution

Darwin first demonstrated the importance of the grass coleoptile tip in perceiving the phototropic light stimulus. The coleoptile tip itself had to be irradiated in order for curvature of the lower regions of the coleoptile to develop curvature.

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