How does carbon dioxide concentration affect photosynthesis rate?

An increase in the carbon dioxide concentration increases the rate at which carbon is incorporated into carbohydrate in the light-independent reaction - and so the rate of photosynthesis generally increases until limited by another factor.

Explanation:

CO2 concentration is directly proportional to rate of photosynthesis.

CO2 is raw material for process of photosynthesis.

CO2 + H2O → C6H12O6 + O2

Increase in CO2 concentration increases rate of photosynthesis.

Decrease in CO2 concentration decreases rate of photosynthesis.

Therefore, CO2 concentration is limiting factor for rate of photosynthesis.

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