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Charles Darwin and his son, Francis expe...

Charles Darwin and his son, Francis experimented with phototropism of grass seedlings by placing a metal foil blindfold over different parts of the seedling's coleoptile. A simplified version of their results is shown below. Which of the following statements best explains their results?

A

The light signal is perceived a few milimetres below the tip, and these cells cause the coleoptile to grow toward the light.

B

Both the seedling root and coleoptile perceie and respond to light in the same manner.

C

A chemical messenger must travel from the base of the coleoptile to the tip.

D

The light signal is perceived at the tip of the coleoptile, but the growth response occurs a few milimetres below the tip.

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The correct Answer is:
d
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