NEET · Biology · STD 11 - 2. Biology classification

The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the which of the following?

A methanogens
B eubacteria
C halophiles
D thermoacidophiles

Verified Solution

Answer & Solution

Correct Answer

(A) methanogens

Step-by-step Solution

Detailed explanation

(a) : Methanogens belong to archaebacteria. They include methane producing genera such as Methanobacillus and Methanothrix. Methanogens are obligate anaerobes found in oxygendeficient environments, such as marshes, swamps, sludge (formed during sewage treatment), and the digestive systems of ruminants. Mostly they obtain their energy by reducing carbon dioxide and oxidising hydrogen, with the production of methane.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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