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What are meth...

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What are methanogens? How do they help to generate biogas? [3]

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Methanogens are the bacteria found in cattle dung (gobar) and in anaerobic sludge during sewage treatment. [1] They grow anaerobically on cellulosic material and produce a large amount of methane (main constituent of bio gas) along with $C O_{2}$ and $H_{2}$ . Thus, methanogens are used in biogas production. [2]

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What are methanogens? How do they help in generation of biogas?

Q. How do methanogens help in producing biogas?

Q. Read the following statements regarding methanogens and select the correct option

i) They are included in the group Archaebacteria.
ii) They are responsible for the production of biogas in gobar gas plants.
iii) They live in hot sulphur springs.
iv) They are strictly anaerobic.

Q. I have a doubt.
I have read that methanogens are present in cows gut. Hence, methanogens digest whatever they can in the cow's gut. There should hence be nothing in cow's excreta that can be digested by methanogens (Everything is digested before excretion).
If I am correct till here.. it means that if we provide cow's dung to methanogens for them to break it down they have nothing left and won't be able to break it down.
Then how can we use cow dung in a biogas plant because cow dung has nothing left to be digested by methanogens!!!???

Q. Biogas production from waste biomass with the help of methanogenic bacteria is

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