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In an experiment, the rate of photosynthesis of a C₃ plant stops rising when light is increased further, but rises again when CO₂ is increased. In the first case, the limiting factor was

(a) temperature Your answer
(b) light Your answer
(c) water Your answer
(d) CO₂ Correct

Your answer: Correct answer: (d)

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Explanation

Why (d) is correct

The rate stopped rising with more light but rose again with more CO₂, so CO₂ was the limiting factor.

Why the other options are wrong

(a) · your answer Raising CO₂, not temperature, raised the rate.
(b) · your answer More light no longer raised the rate, so light was not limiting.
(c) · your answer Water was not changed.

NCERT point: Blackman's law: only the limiting factor changes the rate.

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