NEET 2013 Biology question

During sewage treatment, biogases are produced which include :

(1)methane, hydrogen sulphide, carbon dioxideCorrect
(2)methane, oxygen, hydrogen sulphide
(3)hydrogen sulphide, methane, sulphur dioxide
(4)hydrogen sulphide, nitrogen, methane

Answer: (1)

Solution

In secondary (biological) treatment of sewage, the activated sludge is passed into large anaerobic sludge digesters where anaerobic bacteria digest the bacteria and fungi of the sludge. During this digestion a mixture of gases - biogas

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Question ID VK-091469