NEET 1997 · Class 12

Microbes in Human Welfare

Gobar gas contains mainly

  1. (A)CO2 + H2
  2. (B)CO2 + H2O
  3. (C)CH4 only
  4. (D)CH4 + CO2

The NCERT line that answers it

Verbatim line

However, certain bacteria, which grow anaerobically on cellulosic material, produce large amount of methane along with $\text{CO}_2$ and $\text{H}_2$ .

Chapter
Microbes in Human Welfare
Section
8.4 MICROBES IN PRODUCTION OF BIOGAS
Page
6
Words matched
42 of 45

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 that certain bacteria produce 'large amount of methane along with CO₂ and H₂', which directly supports that gobar gas contains CH₄ + CO₂, matching option D.

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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.