NEET 2021 · Class 11

Photosynthesis in Higher Plants

The first stable product of CO2 fixation in Sorghum is

  1. (A)Pyruvic acid
  2. (B)Oxaloacetic acid
  3. (C)Succinic acid
  4. (D)Phosphoglyceric acid

The NCERT line that answers it

Verbatim line

Experiments conducted over a wide range of plants led to the discovery of another group of plants, where the first stable product of $\text{CO}_2$ fixation was again an organic acid, but one which had 4 carbon atoms in it.

Chapter
Photosynthesis in Higher Plants
Section
11.7 WHERE ARE THE ATP AND NADPH USED?
Page
12
Words matched
33 of 49

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

How this line gives the answer

25, emb=0.9869, combined=0.6922). Verified: high — The span explicitly states that in some plants, the first stable product of CO2 fixation is a 4-carbon organic acid identified as oxaloacetic acid (OAA), which directly matches the question about Sorghum (a C4 plant) and the correct answer.

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Question text is reproduced from the published NEET 2021 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.