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Disadvantages of Burning Fossil Fuels

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Question

give reasons y the use of cow dung in biogas plant is prefferd to burning cow dung cakes for cooking

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Solution

Because cow dung after being processed in a biogas plants gives biogas which comprises mainly of methane which is a fuel with higher efficiency and lesser tendency to create pollution.

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Q. Biogas plant is more useful than burning of dung cakes because

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)
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In a biogas plant, the cow dung and water are mixed in equal proportion to prepare:

Q. Cow dung cake is a nutritious food for crops.

Q. In the village area, people make cow-dung cakes and use it as a fuel for cooking. This irritates the eyes and causes lots of pollution.
Give any 2 benefits of your suggestion.

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