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(D) Charles Darwin and his son Francis Darwin conducted experiments on the coleoptiles of canary grass $(Phalaris \, canariensis)$.They observed that

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Phototropism

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(D) Charles Darwin and his son Francis Darwin conducted experiments on the coleoptiles of canary grass $(Phalaris \, canariensis)$.They observed that the coleoptiles responded to unilateral illumination by growing towards the light source.This phenomenon of growth towards light is known as phototropism.Their experiments demonstrated that the tip of the coleoptile was the site of light perception, which then transmitted a signal to the lower part to cause bending.

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