Biology for IGCSE & O level - Plant Nutrition (Section 6 - No. 37)
How does carbon dioxide concentration influence the rate of photosynthesis?
Increasing CO2 always slows down the rate
Increasing CO2 always speeds up the rate
Increasing CO2 speeds up the rate up to a point, then it plateaus
CO2 has no effect on photosynthesis
Explanation
Photosynthesis increases with CO2 concentration up to a certain level. After reaching this point, there's no significant increase in the rate.
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