Question

Methanogenic bacteria present in
A)Anaerobic sludge
B)Rumen (a part of the stomach) of cattle
C)Both (1) and (2)
D)None of these

Answer 1

Hint: Certain bacteria, which grow anaerobically on cellulosic material, generate a large amount of carbon dioxide methane and hydrogen. These bacteria are called methanogens, and one such common example is Methanobacterium.

Complete step-by-step answer:
During sewage treatment Methanogens are commonly found in the anaerobic sludge.Along with methanogens lot of cellulose present in the fodder is also present in the rumen. As methanogenic bacteria are present in both anaerobic sludge and rumen of cattle.

Hence the correct answer is option C) Both (1)and (2).

Additional Information: In rumen these bacteria help in the disintegration of cellulose and play an important role in the nourishment of cattle. Thus, the faeces (dung) of cattle, commonly called gobar, is rich in these bacteria. Excrement(dung) can be used for the generation of biogas, commonly called gobar gas. Cattle dung is available in plenty in rural areas where cattle are used for a variety of purposes. So biogas plants are often built in rural areas. The biogas thus produced is used for lightening and cooking.

Note: Methanogens are archaea bacteria that produce methane as a metabolic by-product. It is widespread and is found in mud, sewage, and sludge. And methanotrophs play an important role in the oxidation of methane in the natural environment. They oxidise methane produced, thereby reducing the release of methane to the atmosphere from landfill sites, wetlands, and rice paddies.