A) The primary fixation of\[C{{O}_{2}}\]is mediated via PEP carboxylase
B) Effective pumping of \[C{{O}_{2}}\]into bundle sheath cells
C) Four carbon acids are the primary initial\[C{{O}_{2}}\] fixation products
D) Rubisco in\[{{C}_{4}}\]plants has higher Inanity for \[C{{O}_{2}}\]
Correct Answer: A
Solution :
In\[{{C}_{4}}\]plants, initial fixation of carbon dioxide occurs in mesophyll cells. The primary acceptor of \[C{{O}_{2}}\]is phosphoenol pyruvate or PEP. It combines with carbon dioxide in the presence of PEP carboxylase or Pepcase to form oxaloacetate. \[{{C}_{4}}\]plants are more efficient in picking up \[C{{O}_{2}}\]even when it is found in low concentration because of the high affinity of PEP case.
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