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(B) Charles Darwin and his son Francis Darwin conducted experiments on the coleoptiles of canary grass $(Phalaris 	ext{ canariensis})$. They observed

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Phototropism

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(B) Charles Darwin and his son Francis Darwin conducted experiments on the coleoptiles of canary grass $(Phalaris 	ext{ canariensis})$. They observed that the coleoptiles bent towards a light source, a phenomenon known as phototropism. They concluded that the tip of the coleoptile is the site of perception of light and that some transmissible influence (later identified as auxin) is produced in the apical part, which causes the bending of the plant towards the light.

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