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The condition that indicates a polluted environment is

1. BOD value of 5 ppm
2. eutrophication
3. 0.03% of CO2 in the atmosphere
4. pH of rain water to be 5.6

Correct answer: eutrophication

Solution

BOD of 5 ppm, 0.03% CO2, and rain pH 5.6 are all normal/clean conditions. Eutrophication (nutrient over-enrichment causing algal blooms and oxygen depletion) is the indicator of a polluted environment. Correct option: eutrophication.

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