NEET-UG Biology · Class 12
Microbes in biogas production — NEET & JEE Questions
Microbes in biogas production is a topic in Microbes in Human Welfare, a Class 12 Biology chapter of the NEET-UG syllabus. TestBudy holds 12 published NEET-UG questions on Microbes in biogas production, each with the marking scheme of the real paper.
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Microbes in biogas production MCQs with solutions
10 of the 12 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.
Which group of microbes is primarily responsible for methane production in biogas plants?
- A. Mycorrhizal fungi
- B. Cyanobacteria
- C. Lactic acid bacteria
- D. Methanogens
Why are anaerobic conditions maintained in a biogas digester?
- A. Methane is produced only by photosynthesis
- B. Methanogens function best without oxygen
- C. Oxygen is needed to form dung slurry
- D. Aerobic bacteria alone make methane
Why is cattle dung a useful starting material for many biogas plants?
- A. It is composed only of methane
- B. It contains no microorganisms
- C. It supplies organics plus methanogens
- D. It prevents all anaerobic decomposition
Methanogens are important in biogas production because they
- A. produce methane under anaerobic conditions
- B. produce oxygen by photosynthesis
- C. convert methane into nitrogen gas only
- D. require strongly aerobic digesters
Which gas is the major combustible component of biogas?
- A. Methane
- B. Oxygen
- C. Nitrogen
- D. Hydrogen chloride
A biogas digester receives plenty of organic slurry, but oxygen continuously leaks into the chamber. What is most likely to happen?
- A. The slurry becomes sterile immediately
- B. Methane production necessarily doubles
- C. Only photosynthesis increases
- D. Methane production decreases
Why is a biogas digester maintained largely anaerobic?
- A. Methanogenic microbes function under oxygen-free conditions
- B. Oxygen is needed to make methane
- C. Anaerobic conditions prevent all microbial activity
- D. Only photosynthetic microbes produce biogas
Cattle dung is commonly used as feedstock for biogas plants partly because it
- A. contains organic matter and methanogenic microbes useful for anaerobic digestion
- B. contains no microbes
- C. is composed entirely of methane already
- D. prevents fermentation
Why are methanogens also found in the rumen of cattle?
- A. They aid anaerobic breakdown in the rumen
- B. They carry out oxygenic photosynthesis
- C. They fix atmospheric nitrogen specifically for the grazing animal
- D. They digest cellulose using sunlight
Which gas is the major combustible component responsible for the fuel value of biogas?
- A. Methane
- B. Carbon dioxide
- C. Nitrogen
- D. Oxygen
Common mistakes in Microbes in biogas production
Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.
- Assuming gas output depends only on the presence of a sealed digester.
- Assumes aeration benefits methanogens in the same way it benefits aerobic microbes.
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