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Biogas plant is more useful than burning of dung cakes because

1. It is non-pollutant
2. It yields manure as well as fuel gas.
3. It yields important biochemicals.
4. Both A and B

Correct answer: Both A and B

Solution

Biogas plants are better because they produce clean fuel with much less smoke and air pollution than burning dung cakes. They also leave behind slurry that can be used as manure, so they provide both energy and fertilizer.

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