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Question

Which of the following is released when anaerobic bacteria act upon waste substances?

A
Hydrogen sulphide
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B
Methane
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C
Carbon dioxide
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D
Water
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Solution

The correct option is A Hydrogen sulphide
Usually the aerobic bacteria acts upon the biodegradable substances. When oxygen is not available, then the anaerobes take over and produce hydrogen sulphide and other poisonous foul smelling substances.

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