Q4 of 269 Page 148

Name the agent which decomposes animal dung into biogas.

Anaerobic bacteria decomposes animal dung into biogas. It digests the animal dung into a closed system and produces the biogas.


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Name one source of energy which is not derived from solar energy directly or indirectly.

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What name is given to the heat energy obtained from hot rocks inside the earth?

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Which component of biogas is used as a fuel?

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Name the constituents of biogas.