Charles Darwin was a brilliant researcher of plant biology who was far ahead of his time. His experiments on phototropism in seedlings of a grass plant
A) established that the base of the coleoptile contained the photoreceptor for phototropism.
B) led Darwin and his son to hypothesize the existence of a growth-promoting substance in the coleoptile.
C) showed that the growing region of the coleoptile and the light-sensing area were the same.
D) showed that the tip of the coleoptile was not required for the phototrophic response.
E) showed that light has no effect on plant development.
Correct Answer:
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