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According to NCERT, the concentration of CO₂ in the atmosphere is about

(a) 0.3-0.4% Your answer
(b) 0.003-0.004% Your answer
(c) 0.03-0.04% Correct
(d) 3-4% Your answer

Your answer: Correct answer: (c)

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Explanation

Why (c) is correct

NCERT gives the atmospheric CO₂ concentration as about 0.03 to 0.04 per cent. At this low level, CO₂ is often a limiting factor for photosynthesis.

Why the other options are wrong

(a) · your answer 0.3-0.4% is ten times too high.
(b) · your answer 0.003-0.004% is ten times too low.
(d) · your answer 3-4% is about a hundred times too high.

NCERT point: Raising CO₂ to about 0.05% increases CO₂ fixation.

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