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(D) The experiments conducted by Charles Darwin and his son Francis Darwin on canary grass coleoptiles demonstrated that the coleoptile tip is the sit

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$A -$ tip

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(D) The experiments conducted by Charles Darwin and his son Francis Darwin on canary grass coleoptiles demonstrated that the coleoptile tip is the site of light perception.When the tip was removed or covered,the coleoptile did not bend towards the light.This indicated that the tip produces a transmittable influence (later identified as the hormone auxin) that moves downwards and causes the bending of the entire coleoptile towards the light source.Therefore,the correct answer is $A -$ tip.

After a series of experiments,it was concluded that the ....$A$.... of coleoptile was the site of transmittable influence that caused the bending of the entire coleoptile.

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