Question

Photosynthesis in c4 plants is relatively less limiting by atmosphere co2 levels because

Answer 1

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 oxaloaceticacid (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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