In C4 plants to avoid photorespiration, they have evolved CO2 concentrating mechanisms. These plants tend to be found in drier environments with high sunlight levels.
Will increasing CO2 levels in the atmosphere reduce the advantage of C4 versus C3 plants in these environments? Justify.

Yes

Explanation:

In hot regions, with intense sunlight where stomata closes during the day, C3 plants photorespiration drains away as much as the 50% of the carbon fixed by the Calvin cycle for photosynthesis. C4 plants have evlove to minimize photorespiration and increase photosynthesis.

As CO2 levels are increased C3 photo-respiration decreases. More CO2 increases the photosynthetic rate of C3 plants. The increasing photosynthetic yield of C3 plants at higher levels of atmospheric CO2 makes C3 plants as better as C4 plants. In addition less ATP is used in C3 plants when compared to the energy cost of C4 photosynthesis

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