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Increasing CO₂ concentration up to about 0.05% increases CO₂ fixation. Beyond this,

(a) only C₃ plants are damaged Your answer
(b) the rate keeps increasing indefinitely Your answer
(c) it can be damaging over longer periods Correct
(d) photosynthesis stops at once Your answer

Your answer: Correct answer: (c)

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Explanation

Why (c) is correct

Increasing CO₂ up to about 0.05% increases fixation, but beyond this it can be damaging over longer periods.

Why the other options are wrong

(a) · your answer The damage over longer periods is not limited to C₃ plants in NCERT.
(b) · your answer The rate does not increase indefinitely.
(d) · your answer Photosynthesis does not stop at once.

NCERT point: Greenhouses use moderately raised CO₂.

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