NEET 1992 · Class 11

Photosynthesis in Higher Plants

The enzyme that catalyses carbon dioxide fixation in C4 plants is

  1. (A)RuBP carboxylase
  2. (B)PEP carboxylase
  3. (C)carbonic anhydrase
  4. (D)carboxydismutase

The NCERT line that answers it

Verbatim line

The primary $\text{CO}_2$ acceptor is a 3-carbon molecule **phosphoenol pyruvate (PEP)** and is present in the mesophyll cells.

Chapter
Photosynthesis in Higher Plants
Section
11.8 THE $\text{C}4$ PATHWAY
Page
15
Words matched
26 of 29

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states 'The enzyme responsible for this fixation is PEP carboxylase', which directly answers the MCQ about the enzyme catalyzing CO₂ fixation in C4 plants.

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Question text is reproduced from the published NEET 1992 paper for study and commentary. NCERT text is quoted, not redistributed; textbooks remain at ncert.nic.in. Our mapping method, including its measured error rates, is published at /methodology.