When the absorption spectrum of chlorophyll a is superimposed on the action spectrum of photosynthesis, they

(a) match only in the infra-red region Your answer
(b) closely match, mostly in the blue and red regions Correct
(c) do not match at any wavelength at all Your answer
(d) match only in the green and yellow region Your answer

Your answer: Correct answer: (b)

Explanation

Why (b) is correct

The absorption spectrum of chlorophyll a and the action spectrum of photosynthesis closely match, with peaks mostly in the blue and red regions. This shows that chlorophyll a is the chief pigment.

Why the other options are wrong

(a) · your answer Infra-red light is not used for photosynthesis.
(c) · your answer They match closely, which is the key observation.
(d) · your answer Both are low in the green-yellow region.

NCERT point: The small differences are due to accessory pigments, which also absorb light used in photosynthesis.

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When the absorption spectrum of chlorophyll a is superimposed on the action spectrum of photosynthesis, they

Explanation

Why (b) is correct

Why the other options are wrong

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