Which one of the following organisms is used as an indicator of water quality?
Correct answer: B. Escherichia
- A. Azospirillum
- B. Escherichia
- C. Eichhornia
- D. Chlorella
Explanation
E.coli is the most common indicator of water pollution. It naturally occurs in the intestines of human beings and animals. They are commonly found in sewage and if E.coli are detected in water, it is indicative of faecal contamination. So if E.coli are detected in drinking water it indicates a serious health risk and that water should not be used for drinking.
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