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Question

A lake which is rich in organic waste may result in

A
Increased population of fish due to lots of nutrients
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B
Mortality of fish due to lack of oxygen
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C
Increased population of aquatic organisms due to minerals
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D
Drying of the lake due to algal bloom
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Solution

The correct option is B Mortality of fish due to lack of oxygen
When much of the organic matter is present in lake lots of microbial activity takes place in its decomposition process. So, demand for oxygen increases. This increased oxygen demand depletes the oxygen in water at faster rates. This adversely affects the living conditions of other organisms like fishes, ultimately causing their death.

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