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Water Pollution

Which of the ...

Question

Which of the following processes is responsible for the existence of a stream free of pollutants within a few miles downstream of a point at which a small amount of sewage is dumped into it?

A

Succession

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B

Biological magnification

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C

Evaporation

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D

Photosynthesis

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E

Decomposition

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Solution

The correct option is E Decomposition
The presence of decomposers (bacteria) in sewage leads to decomposition of complex organic compounds of sewage into simpler substances. These simpler substances are then consumed by the decomposers as a source of organic compounds. This led to the formation of pollution free stream out of a sewage dump. Thus, the correct answer is option E.

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