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C4 Plants do not undergo photorespiration because of PEP carboxylase, since it has high affinity for CO2.

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1. C4 plants have a special enzyme for accepting the atmosphere CO2. It can accept CO2 even if it lies 1-2 ppm (parts per million)

2. RUBISCO enzyme of C3 plants can't accept CO2 below 50 ppm, hence photorespiration takes place.

3. PEP carboxylase is efficient in CO2 accepting and hence photorespiration doesn't take place in C4 plants.

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In C4 plants photorespiration does not occur because C4 acid from the mesophyll is broken down in the bundle cells to release CO2 this result in increasing the intracellular conc. of CO2. So this ensure that the RuBisCO functions as a carboxylase minimizing the oxygenase activity.

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