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Which one of the following organisms is used as indicator of water quality?

1. Chlorella
2. Azospirillum
3. Escherichia
4. Biggiatoa

Correct answer: Escherichia

Solution

Escherichia, especially E. coli, is widely used as an indicator organism for water quality because its presence suggests fecal contamination and possible pathogenic microbes. The other options are not standard water-quality indicator organisms.

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