NEET 2000 · Class 11

Photosynthesis in Higher Plants

Which is the first CO2 acceptor enzyme in C4 plants?

  1. (A)RuDP carboxylase
  2. (B)Phosphoric acid
  3. (C)RuBisCO
  4. (D)PEP-carboxylase

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 primary CO2 acceptor is a 3-carbon molecule phosphoenol pyruvate (PEP)' and 'The enzyme responsible for this fixation is PEP carboxylase or PEPcase', which directly identifies PEP-carboxylase as the first CO2 acceptor enzyme in C4 plants.

We did this for 1,565 questions.

Every one traced to the exact sentence in NCERT that answers it, including 90% of the 2026 paper. Sit a mock on the real NEET 2027 computer interface and every mark you drop comes back with its line attached.

Take the free 5-minute checkMore from this chapter

Question text is reproduced from the published NEET 2000 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.