Q.

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.
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