The presence of which of the following is an indication that the water is unfit for drinking?

Paramecium

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E.coli

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Coliform bacteria

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All of these

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Solution

The correct option is C Coliform bacteria
The presence of coliform bacteria is a clear indication that the water from a particular source is unfit for drinking. Coliform bacteria are seen in the intestine of humans and other vertebrates. Therefore their presence indicates that the water has been contaminated with human/animal waste.

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