A) Effective pumping of \[\text{C}{{\text{O}}_{\text{2}}}\]into bundle sheath cells.
B) Rubis CO in \[{{\text{C}}_{\text{4}}}\] plants has higher affinity for\[C{{O}_{2}}.\]
C) Four carbon acids are the primary initial \[C{{O}_{2}}.\]fixation products.
D) The primary fixation of \[C{{O}_{2}}\] is mediated through PEP carboxylase.
Correct Answer: D
Solution :
In\[{{C}_{4}}\]plants, the initial fixation of carbon dioxide occurs in mesophyll cells. The primary acceptor of\[C{{O}_{2}}\]is phosphoenolpyruvate or PEP. It combines with carbon dioxide in the presence of PEP carboxylase or PEP Case 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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