alleryThe gas biogas is composed predominantly of
ANitrogen
BCarbon dioxide only
CAmmonia
DMethane
Answer & Solution
Correct answer: D. Methane
1. Your syllabus 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: syllabus Biology, Ch 8 "Microbes in Human Welfare", §8.4_
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