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  1. Which one of the following organisms is used as indicator of water quality?
    1. Chlorella
    2. Azospirillum
    3. Escherichia
    4. Biggiatoa
Correct Option: C

E. coli lives in the human intestine. If they are present in water it indicates that the water is polluted. E.coli coliform count test is done to test the quality of water.



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