$C O_{2}$ fixation rate in under high light condition in $C_{3}$ & $C_{4}$ is:

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Solution

C3 plants grow in temperate climate, whereas c4 plants grow in tropical climate. So due to high light conditions, the temperature increases.
In the case of C3 plants, the transpiration increases due to high temperature. The stoma closes to reduce the transpiration. So carbon dioxide intake reduces which leads to reduction in carbon dioxide fixation.
In case of C4 plants, they are adapted to live in a high temperature. So, there is not be any change in carbon dioxide fixation process.

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