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Biogas Production

Biogas is pro...

Question

Biogas is produced by the decomposition of the cow dung by the methanogens present in it.

A

True

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B

False

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Solution

The correct option is A True
The process of biogas production involves decomposition of the cow dung by bacteria called methanogens in order to produce methane and hydrogen.

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Q. Biogas is produced by the decomposition of cow dung by the methanogens present in it.

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. Mention any two ways in which cow dung can be utilised as a fuel. Out of two which is better? Justify. (2 marks)
Ans. Cow dung can be used by burning cowdung itself or by burning biogas produced from it. Biogas is more efficient as it's thermal efficiency is higher than that of cow dung. It doesnt contain moisture while cow dung has a lot.
(I got only 1 out of 2 marks)
What should I add?

Q. Read the following statements and choose the correct option:
Assertion: Biogas plants are mostly situated in rural areas.
Reason: Biogas is produced by the action of aerobic decomposers on a slurry of cow dung and water.

Q. How do methanogens help in producing biogas?

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