A) four carbon acids are the primary initial \[C{{O}_{2}}\] fixation products
B) the primary fixation of \[C{{O}_{2}}\] is mediated via PEP carboxylase
C) effective pumping of \[C{{O}_{2}}\] into bundle sheath cells
D) RUBISCO in \[{{C}_{4}}\] plants has higher affinity for \[C{{O}_{2}}\]
Correct Answer: B
Solution :
The fixation of \[C{{O}_{2}}\] in \[{{C}_{4}}\] plants takes place in two places and by two different organic compounds. Phosphoenol pyruvate (PEP) is found in mesophyll cells which primarily fixes atmospheric \[C{{O}_{2}}\] into oxaloacetic acid (4C). RUBISCO is present in bundle sheath cells where final fixation of \[C{{O}_{2}}\] in hexose sugars takes place. \[C{{O}_{2}}\] is primarily fixed by PEP carboxylase because this enzyme has greater affinity to \[C{{O}_{2}}\] than RUBISCO.
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