Question

A lake with an inflow of domestic sewage, rich in organic waste, may result in

A

Drying of the lake very soon due to algal bloom

B

An increased production of fish due to lot of nutrients

C

Death of fish due to lack of oxygen

D

Increased population of aquatic web organisms

Hard

Solution

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Correct option is C)

Domestic sewage contains biodegradable organic matter, which is decomposed by bacteria and other micro-organisms. They multiply by using these organic substances as substrates. Micro-organisms involved in biodegradation of organic matter in the water body consume a lot of dissolved oxygen, and as a result, there is a sharp decline in dissolved oxygen. This causes mortality of fish and other aquatic creatures. 

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