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At low light intensity, the rate of CO₂ fixation shows

(a) saturation Your answer
(b) no change with light Your answer
(c) a decrease with increasing light Your answer
(d) a linear increase with increasing light Correct

Your answer: Correct answer: (d)

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Explanation

Why (d) is correct

At low light, the rate of CO₂ fixation rises linearly as light increases, because light is the limiting factor.

Why the other options are wrong

(a) · your answer Saturation happens only at higher light.
(b) · your answer At low light the rate does change with light.
(c) · your answer The rate rises, not falls, with more light at low intensity.

NCERT point: Saturation is reached at about 10% of full sunlight.

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