What are the bacteria called that produce methane, CO2 and H2 during anaerobic digestion of cellulosic material?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Methanogens
Certain bacteria grow anaerobically on cellulosic material and give out a large amount of methane along with CO2 and H2. These bacteria are collectively called methanogens; Methanobacterium is a common example. They live in the anaerobic sludge of sewage plants and in the rumen of cattle, which is why cattle dung is used to make biogas (gobar gas).
NCERT Extract:
Microbes in Production of Biogas – “… However, 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.”