Biology for IGCSE & O level - Plant Nutrition (Section 7 - No. 22)
What is the relationship between the rate of photosynthesis and the concentration of carbon dioxide?
As CO2 increases, photosynthesis decreases.
As CO2 increases, photosynthesis increases up to a point then plateaus.
CO2 has no effect on photosynthesis.
As CO2 decreases, photosynthesis increases.
Explanation
Initially, the rate increases with CO2 until other factors limit it.
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