During a Year,plants Never Use 100% of the Incoming Solar

question 34

Multiple Choice

During a year,plants never use 100% of the incoming solar radiation for photosynthesis.What is a reasonable explanation for this?
I.Plants cannot photosynthesize as well during winter (in cold winter climates) .
II.Plants cannot photosynthesize as well on cloudy days.
III.The pigments that drive photosynthesis respond to only a fraction of the wavelengths that are available.

• A)only I
• B)only II
• C)only III
• D)I, II, and III

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