A) four carbon acids are the primary initial CO2 fixation products
B) the primary fixation of CO2 is mediated via PEP carboxylase
C) effective pumping of CO2 into bundle sheath cells
D) RUBISCO in C4 plants has higher affinity for CO2
Correct Answer: B
Solution :
| [B] The fixation of CO2 in C4 plants takes place in two places and by two different organic compounds. Phosphoenol pyruvate (PEP) is found in mesophyll cells which primarily fixes atmospheric CO2 into oxaloacetic acid (4C). RUBISCO is present in bundle sheath cells where final fixation of CO2 in hexose sugars takes place. CO2 is primarily fixed by PEP carboxylase because this enzyme has greater affinity to CO2 than RUBISCO. |
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