Prepare for NEET Biology Microbes in Human Welfare (Bio Gas) with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert help to study methane-producing microbes and biogas plant functioning.
NEET Questions / Zoology / Microbes in Human Welfare / Bio Gas
During biogas production, a specific group of methanogens utilizes acetate directly for methane formation. Which of these is NOT a characteristic of this metabolic pathway?
It involves the reduction of carbon dioxide to methane.
It is carried out by acetoclastic methanogens.
It contributes significantly to methane production in many biogas digesters.
It is often inhibited by high concentrations of hydrogen.
The syntrophic relationship between bacteria and methanogens in biogas production is crucial. Which of the following is NOT a direct consequence of this interaction?
Removal of inhibitory metabolic byproducts for bacteria.
Increased oxygen availability for methanogens.
Maintenance of a low hydrogen partial pressure.
Efficient degradation of complex organic matter.
In a biogas digester operating at mesophilic temperatures, a sudden drop in methane production is observed. Which of the following is LEAST likely to be the direct cause?
Accumulation of ammonia beyond the inhibitory threshold.
Introduction of heavy metals into the digester feedstock.
A sudden decrease in the digester temperature to 10°C.
Increased concentration of volatile fatty acids within the optimal range.
Which specific enzymatic step is crucial in the final stage of methane formation by methanogens and is often targeted by inhibitors?
Formate dehydrogenase catalyzed reaction
Acetyl-CoA synthetase catalyzed reaction
Hydrogenase catalyzed reaction
Methyl-coenzyme M reductase catalyzed reaction
The biogas produced in a digester contains a substantial amount of an undesirable gas that needs to be removed for efficient energy utilization. This gas is primarily:
Carbon monoxide
Hydrogen sulfide
Oxygen
Ammonia
A biogas plant utilizes a novel substrate with a high lignin content. Which microbial community would likely be MOST affected, potentially limiting biogas yield?
Methanogens
Acetogens
Hydrolytic bacteria
Syntrophic bacteria
Which of the following is the primary component of biogas?
Carbon dioxide
Hydrogen sulfide
Nitrogen
Methane
What is the process by which biogas is produced?
Aerobic respiration
Photosynthesis
Combustion
Anaerobic digestion
Which of these is a common substrate used for biogas production?
Plastic
Glass
Metal
Animal manure
Biogas is considered a renewable energy source because:
It is derived from fossil fuels.
It produces no emissions.
It is readily available in nature.
It is produced from organic waste that can be replenished.
