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Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because

A
effective pumping of CO2 into bundle sheath calls
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B
RuBisCo in C4 plants has higher affinity for CO2
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C
four carbon acids are the initial CO2 fixation products
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D
the primary fixation of CO2 is mediated via PEP carboxylase.
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Solution

The correct option is D the primary fixation of CO2 is mediated via PEP carboxylase.

Plants such as sugarcane and sorghum fix atmospheric carbon dioxide into phosphoenol pyruvic acid to produce oxaloacetic acid( a C4 acid) in the presence of phosphoenol pyruvate carbooxylase(PEP carboxylase). Such plants are called C4 plants.

In C4 plants, the primary product of OAA is mediated by PEP carboxylase, so it is relatively less limited by atmospheric CO2 levels.

So, the correct answer is 'The primary fixation of CO2 is mediated via PEP carboxylase'.


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