Question

if we keep on increasing co2 concentration in the air what will be the rate of photosynthesis

Answer 1

Increase in CO2 increases the rate of photosynthesis but only if not limited by other factors like light and temperature. If they are no limiting factors then the rate of photosynthesis increases. This increase is observed up to 1% of CO2 concentration. At the same time very high concentration of CO2 becomes toxic to plants and inhibits photosynthesis. So amount of CO2 released decides the rate of photosynthesis.

Answer 2

Explanation:

if we keep on increasing CO2 concentration in the air, the rate of photosynthesis will not keep on increasing in direct proportion. At first, if carbon dioxide concentration increases, the rate of photosynthesis will increase but up to certain limit then it gets stabilized.