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Escherichia coli is used as an indicator organism to determine pollution of water with

1. pollen of aquatic plants
2. heavy metals
3. faecal matter
4. industrial effluents

Correct answer: faecal matter

Solution

Escherichia coli (E. coli) is a bacterium commonly found in the intestines of humans and animals. Its presence in water indicates contamination by faecal matter, as it is released in feces.

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