Where are methanogens commonly found?

Step-by-step solution

Certain bacteria, which grow anaerobically on cellulosic material, produce large amount of methane along with CO2 and H2 . These bacteria are collectively called methanogens, and one such common bacterium is Methanobacterium. These bacteria are commonly found in the anaerobic sludge during sewage treatment. These bacteria are also present in the rumen (a part of stomach) of cattle. A lot of cellulosic material present in the food of cattle is also present in the rumen. In rumen, these bacteria help in the breakdown