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Causes and Effects of Water Pollution

A pollution f...

Question

A pollution free stream within a few miles downstream of a point at which a small amount of sewage is being dumped into it. This is the result of

A

Succession

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B

Eutrophication

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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
Presence of decomposers (bacteria) in sewage leads to decomposition of complex organic compounds of sewage into simpler substances. These simpler substances are then consumsed by the decomposers as source of organic compounds. Hence, decomposition of organic compounds and utilization of simper substances by decomposers might have led to formation of pollution free stream out of a sewage dump.
The process of change in ecological community of an area over time which in turn results in formation of climax community is termed as succession; it does not remove pollutants from the habitat.
Eutrophication means increased pollutant due to algal blooms as supported by presence of excess organic compounds in water.
Complex organic substances can not be evaporated.
Photosynthesis is carried out by autotrophs while sewage is mostly occupied by decomposers.
Therefore, the correct answer is option E.

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