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Which one of the following organism is used as indicator of water quality ?A. BeggiatoaB. ChlorellaC. AzospirillumD. Escherichia

Answer» Correct Answer - D
A variety f the enteric group of bacteria (facultative , aerobic) reside in the human large intestine (e.g. E. coli). Therefore, their presence in water supply indicates that water supply has been contaminated by sewage.


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