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A plant is grown under green light only of the same intensity as white light. Compared with white light, its rate of photosynthesis will be

(a) zero, because green light destroys chlorophyll Your answer
(b) much lower Correct
(c) higher Your answer
(d) the same Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

Chlorophylls absorb very little green light, so under green light alone photosynthesis is much lower than under white light.

Why the other options are wrong

(a) · your answer It is not zero: some green light is absorbed, and green light does not destroy chlorophyll.
(c) · your answer White light contains blue and red, which are used far better.
(d) · your answer Green light is used much less efficiently than white light.

NCERT point: The rate of photosynthesis is lowest in green light.

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