The gas biogas is composed predominantly of
A{'text': 'Nitrogen', 'label': 'A'}
B{'text': 'Carbon dioxide only', 'label': 'B'}
C{'text': 'Ammonia', 'label': 'C'}
D{'text': 'Methane', 'label': 'D'}
Answer & Solution
Correct answer: D. {'text': 'Methane', 'label': 'D'}
1. NCERT defines biogas as a mixture of gases predominantly methane (CH₄).
2. Biogas is produced by microbial anaerobic activity on cellulose.
3. Other gases in biogas include CO₂ and H₂.
4. Methanogens produce this methane during anaerobic digestion of sludge.
_Source: NCERT Class 12 Biology, Ch 8 "Microbes in Human Welfare", §8.4_
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