Polluted waters do not contain

Stone fly larvae

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Sewage fungus

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Water hyacinth

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Cyanobacteria

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Solution

The correct option is A Stone fly larvae
Stoneflies are usually found in clean, cool flowing streams. Stoneflies are sensitive to water pollution and not able to survive in warm and contaminated water. Generally, the presence of stoneflies is a reliable indicator of excellent water quality. Therefore it is used as EPT Index (Ephemeroptera-Plecoptera-Trichoptera) to measure water quality condition.

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Similar questions

Household detergents are safe and do not cause water pollution.

Which of the following is usually not a water pollutant?

(a) sewage

(b) fertiliser

(d) pesticide

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