The action spectrum of photosynthesis does not exactly follow the absorption spectrum of chlorophyll a, because

(a) the action spectrum is measured in darkness Your answer
(b) chlorophyll a absorbs green light very strongly Your answer
(c) accessory pigments also absorb light and help photosynthesis Correct
(d) part of the light is absorbed by the cell wall Your answer

Your answer: Correct answer: (c)

Explanation

Why (c) is correct

The action spectrum does not exactly match the absorption spectrum of chlorophyll a because accessory pigments also absorb light and pass the energy on for photosynthesis.

Why the other options are wrong

(a) · your answer The action spectrum is measured in light, not darkness.
(b) · your answer Chlorophyll a absorbs green light poorly.
(d) · your answer The cell wall does not explain the difference.

NCERT point: Accessory pigments fill gaps in the absorption of chlorophyll a.

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The action spectrum of photosynthesis does not exactly follow the absorption spectrum of chlorophyll a, because

Explanation

Why (c) is correct

Why the other options are wrong

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