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. Auxin absorbs mostly far-red light.
C. As light passes through the leaves of the taller plant, most of the red light is absorbed by chlorophyll.
D. Far-red light mostly reflects off the surface of the soil while red light is mostly absorbed.
E. Shade is enriched in far-red wavelengths of light.
C. As light passes through the leaves of the taller plant, most of the red light is absorbed by chlorophyll.
Chlorophyll absorbs light in the red spectrum. So light passing out of a leaf will contain less red wavelengths.
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What will be an ideal response?
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