When one plant is shaded by another, why is the ratio of far-red to red light increased compared to an unshaded plant?
A. Phytochrome in the taller plant absorbs most of the red light.
B. Far-red light mostly reflects off the surface of the soil while red light is mostly absorbed.
C. As light passes through the leaves of the taller plant, most of the red light is absorbed by chlorophyll.
D. Auxin absorbs mostly far-red light.
E. Shade is enriched in far-red wavelengths of light.
Answer: C
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