NEET Biology question

Photosynthesis in C4-plants is relatively less limited by atmospheric carbon dioxide levels because

(A)Four-carbon acids are the initial carbon dioxide acceptors
(B)The primary fixation of carbon dioxide is mediated via PEP carboxylaseCorrect
(C)There is effective pumping of CO2 into bundle sheath cells
(D)RuBisCO in C4-plants has a higher affinity for CO2

Answer: (B)

Solution

PEP carboxylase has a much higher affinity for CO2 (as bicarbonate) than RuBisCO and, unlike RuBisCO, does not compete with O2, allowing C4-plants to fix CO2 efficiently even at low

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Question ID VK-128097