Sludge is made up of matter. On decomposition, it produces .

organic

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biogas

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oxygen

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inorganic

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Solution

The correct option is B biogas
Sludge is the solid organic waste collected below the tank during primary treatment. It is passed on to a separate tank and is decomposed by bacteria. On decomposition of sludge biogas is produced. This biogas is used as fuel or to generate electricity.

Suggest Corrections

	Primary Sludge	Activated sludge
(i)	It is sludge formed during primary sewage treatment.	It is sludge formed during secondary sewage treatment.
(ii)	It possesses flocs of decomposer microbes.	It does not possess flocs of decomposer microbes.
(iii)	It does not require aeration.	Formation of activated sludge requires aeration.
(iv)	A lot of decomposition occurs during formation of primary sludge.	Very little decomposition occurs during formation of activated sludge.