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Question: Answered & Verified by Expert
Photosynthesis in C4 plants is relatively less limited by atmospheric CO2 levels because:
BiologyPhotosynthesis in Higher PlantsNEET
Options:
  • A Effective pumping of CO2 into bundle sheath cells
  • B Rubisco in C4 plants has 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
Solution:
1346 Upvotes Verified Answer
The correct answer is: The primary fIxation of CO2 is mediated via PEP carboxylase
In C4 plants, initial fIxation of carbon dioxide occurs in mesophyll cells. The primary acceptor of CO2 is phosphoenol pyruvate or PEP. It combines with carbon dioxide in the presence of PEP carboxylase or Pepcase to form oxaloacetate.

C4 plants are more efficient in picking up CO2 even when it is found in low concentration because of the high affinity of PEP carboxylcase.

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