alleryRaising CO2 up to about what level can increase CO2 fixation before it turns damaging?
A5 per cent
B1 per cent
C0.5 per cent
D0.05 per cent
Answer & Solution
Correct answer: D. 0.05 per cent
Air holds 0.03 to 0.04 per cent CO2, and raising it to about 0.05 per cent boosts fixation.
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