Question
Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because
there is effective pumping of CO2 into bundle sheath cells
RuBisCO in C4 plants has higher affinity for CO2
six carbon acids are the primary initial CO2 fixation products
the primary fixation of CO2 is mediated via PEP carboxylase.
Solution
D.
the primary fixation of CO2 is mediated via PEP carboxylase.
CO2 acceptor molecule in C4 plants is phosphoenol pyruvate (PEP). C4 plants are more efficient in picking up CO2 even when it is found in low concentration because of high affinity of PEP. PEP carboxylase (PEPcase) is the key enzyme which catalyses the primary fixation of CO2.
