NEET 1997 · Class 11

Photosynthesis in Higher Plants

The CO2 content by volume, in the atmospheric air is about (1997)

  1. (A)3.34%
  2. (B)4%
  3. (C)0.0314%
  4. (D)0.34%

The NCERT line that answers it

Verbatim line

The concentration of $\text{CO}_2$ is very low in the atmosphere (between 0.03 and 0.04 per cent).

Chapter
Photosynthesis in Higher Plants
Section
11.10 FACTORS AFFECTING PHOTOSYNTHESIS
Page
19
Words matched
12 of 16

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

How this line gives the answer

75, emb=1.0, combined=0.9). Verified: high — The span explicitly states 'between 0.03 and 0.04 per cent' for atmospheric CO2 concentration, which conclusively matches the correct answer of 0.0314% and distinguishes it from all incorrect options.

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 1997 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.