A) Lemna pancicostata
B) Eichhomia crassipes
C) Escherichia coli
D) Entamoeba histolytica
Correct Answer: C
Solution :
Since large populations of Escherichia coli are found in human colon, the presence of E. coli in water indicates that, it has been contaminated with faecal matter. Thus, E. coli is commonly known as indicator of water pollution.
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