A) Lemna pancicostata
B) Eichhomia crassipes
C) Escherichia coli
D) Entamoeba histolytica
Correct Answer: D
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. Lemna and Eichhornia are free-floating hydrophytes, which remain in contact with water and air but not soil. E. histolytica is a parasitic and pathogenic protozoan protist which resides in the upper part of large intestine in human beings. It causes amoebic dysentery or amoebiasis.
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