The enzyme that catalyses initial carbon dioxide fixation in C4 plants is
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a
RuBP carboxylase (RUBISCO)
b
PEP carboxylase (PEPcase)
c
Carbonic anhydrase
d
Carboxy dismutase
answer is B.
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Detailed Solution
In C4 plants, primary CO2 acceptor is a 3-carbon molecule phosphoenol pyruvate (PEP) and is present in the mesophyll cells. The enzyme responsible for this fixation is PEP carboxylase or PEPcase.