Apart from cattle dung, the other substance(s) that are added to the biogas plant is/are

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Plant residues

Vegetable waste

Sewage

All the above

answer is D.

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Detailed Solution

Apart from cattle dung, the other substances that are added to the biogas plant are :
●       Plant residues
●       Vegetable waste
●       Sewage
All the cow-dung, various plant materials like the residue after harvesting the crops, vegetable waste and sewage are initially mixed with water and fed into the digester. All the decomposition happens only in the absence of oxygen. After decomposition, the gases like Methane, Carbon dioxide, Hydrogen and hydrogen sulphide are released. Methane makes biogas an excellent fuel. Biogas contains

75

per cent of methane in it. The main advantage of this gas is it doesn’t produce any smoke while burning and also leaves no residue. The heating capacity (calorific value) is high.

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