Paper 1 · People, Development and Environment
Which of the following is considered the common indicator organism of water pollution?
AAmoeba
BBlue-green algae
CEscherichia coli ✓ Correct
DNone of the above
Correct answer: (C) Escherichia coli — The common indicator organism is Escherichia coli, so that is the answer.
Explanation
★The common indicator organism is Escherichia coli, so that is the answer.
★E. coli lives in the intestines and enters water through sewage.
★Its presence in water signals faecal contamination.
★So E. coli is the common indicator organism of water pollution.
★Amoeba and blue-green algae are not used as the standard indicator.
★So the answer is Escherichia coli.
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