When One Plant Is Shaded by Another, Why Is the Ratio

question 42

Multiple Choice

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.

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