Grass coleoptile tips bend towards the source | vedclass

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(D) . Charles Darwin and his son Francis Darwin observed that the coleoptile of canary grass responded to unilateral illumination by growing towards t

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Due to some secretion from the tip

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(D) . Charles Darwin and his son Francis Darwin observed that the coleoptile of canary grass responded to unilateral illumination by growing towards the light source. Later,Peter Boysen-Jensen demonstrated that this response was due to the migration of a chemical substance produced at the tip,which was subsequently identified as auxin. Auxin accumulates on the shaded side of the coleoptile,causing cells on that side to elongate more rapidly than those on the illuminated side,resulting in the bending of the coleoptile towards the light.

Grass coleoptile tips bend towards the source of light because:

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