NEET 1992 · Class 11

Photosynthesis in Higher Plants

The first carbon dioxide acceptor in C4-plants is

  1. (A)phosphoenol-pyruvate
  2. (B)ribulose 1,5-diphosphate
  3. (C)oxaloacetic acid
  4. (D)phosphoglyceric acid

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
15 of 18

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 primary CO₂ acceptor is a 3-carbon molecule phosphoenol pyruvate (PEP)', which directly and conclusively identifies phosphoenol-pyruvate as the first CO₂ acceptor in C4 plants, matching the correct answer.

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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.