Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because
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a
effective pumping of CO2 into bundle sheath cells
b
RuBisCO in C4 plants has a higher affinity for CO2
c
four-carbon acids are the primary initial CO2 fixation products
d
the primary fixation of CO2 is mediated via PEP carboxylase
answer is D.
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Detailed Solution
C4 plants can fix CO2 even in less atmospheric concentration as PEP carboxylase shows more affinity to CO2 than RuBP carboxylase and it helps in maintaining high CO2 concentration around RuBisCO in bundle sheath cells.