"The saturation point for C 3  is obtained at higher concentrations as compared to C 4 . Therefore, CO 2  concentration is more of a limiting factor for C 3  plants." Can you please explain this statement?

Saturation point of CO2 is defined as the concentration of carbon dioxide beyond which no change is observed in the rate of photosynthesis. C4 plants have a highly efficient way of CO2 assimilation. There are two layers of cells; Mesophyll cells which take up carbon dioxide from  atmosphere and transfer it to bundle sheath cell which fix the carbon via calvin cycle. So, CO2 is used very efficiently and at lower levels of CO2 the plants get saturated. But this is not the case with C3 plants hence they get saturated at higher CO2 concentrations.

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