Photosynthesis in Higher PlantsMedium
Question
Photosynthesis in C4-plants is relatively less limited by atmospheric CO2 levels because
Options
A.effective pumping of CO2 into bundle sheath cells
B.rubisco in C4-plants has higher affinity affinity from CO2
C.four carbon acids are the primary initoal CO2 fixation prdoucts
D.the primary fixation CO2 is mediated via PEP carboxylase
Solution
The fixation CO2 in C4-plants takes place two places and by two different organic compounds. Phosphoenol Pyruvate (PEP) is found in mesophyll cells which primarill fixes atmospheric CO2 into oxalo acetic acid (4C). RUBISCO is present in bundle sheath cells where final fixation CO2 in hexose sugars takes place. CO2 is primarily fixed by PEP carboxylase because this enxyme has greater affinity to CO2 than RUBISCO .
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