Experiments done by CharlesDarwin and his son on plant phototropism showed that (A) auxin is pro...

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Experiments done by CharlesDarwin and his son on plant phototropism showed that
(A) auxin is produced in the tip of the coleoptile.
(B) the tip of the coleoptile is the light receptor of the plant.
(C) within coleoptiles, auxin moves laterally away from the source of the light.
(D) more cell elongation takes place on the shaded side of the plant.
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