Treatment of waste water in STP is done by:

Autotrophic bacteria

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Heterotrophic microbes

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Chemoautotrophic microbes

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All the above

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Solution

The correct option is B Heterotrophic microbes
Heterotrophic microorganisms are naturally present in sewage and hence are used in sewage treatment plants (STP). Autotrophs cannot perform decomposition as they use sunlight to produce their energy.

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