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

Begonia

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Chlorella

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Azospirillum

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Escherichia

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Solution

The correct option is D Escherichia
A given sample of water is said to be polluted when faecal matter or other pollutants are found in it. This can be indicated by organisms like Escherichia coli. MPN is the most probable number of E. coli, expected to find in a water sample. MPN is higher in polluted water and is used as an indicator of water pollution.
So, the correct option is D.

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