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Select the correct statement from the following:

1. Biogas is produced by the activity of aerobic bacteria on animal waste
2. Methanobacterium is an aerobic bacterium found in rumen of cattle
3. Biogas, commonly called gobar gas, is pure methane
4. Activated sludge-settled in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria

Correct answer: Activated sludge-settled in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria

Solution

Activated sludge is the microbial floc that settles in sewage treatment tanks, and it contains a large population of aerobic bacteria. The other options are incorrect because biogas is produced by anaerobic, not aerobic, microbes, and methanogens like Methanobacterium are anaerobic.

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