Photosynthesis in C4-plants is relatively less limited by atmospheric CO 2 levels because Options: A . &nbspEffective pumping of CO2 in to bundle sheath cells. B . &nbspRuBisCO in C4 -plants has higher affinity for CO2. C . &nbspFour carbon acids are the primary initial CO2 fixation products. D . &nbspThe primary fixation of CO2 is mediated via PEP carboxylase.

Answer: Option A : A The fixation of CO 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 CO 2 into oxaloacetic acid ( 4C). RuBisCO is present in bundle sheath cells where fixation of CO 2 in hexose sugars takes place.CO 2 is primarily fixed by PEP carboxylase because this enzyme has greater affinity to CO 2 than RuBisCO.

Photosynthesis in C4-plants is relatively less limited by atmospheric CO2 levels

Question

Photosynthesis in C4-plants is relatively less limited by atmospheric CO₂ levels because

Options:

A . Effective pumping of CO2 in to bundle sheath cells.

B . RuBisCO in C4 -plants has higher affinity for CO2.

C . Four carbon acids are the primary initial CO2 fixation products.

D . The primary fixation of CO2 is mediated via PEP carboxylase.

Answer: Option A
:
A
The fixation of CO₂in 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 CO₂into oxaloacetic acid ( 4C).
RuBisCO is present in bundle sheath cells where fixation of CO₂in hexose sugars takes place.CO₂is primarily fixed by PEP carboxylase because this enzyme has greater affinity to CO₂than RuBisCO.

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