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Which one of the following is not a bioindicator of water pollution?
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- Blood-worms
- Stone flies
- Sewage fungus
- Sludge-worms.
Correct Option: B
Stone flies are not bioindicators. Bioindicators provide a range of techniques to assess the impacts of air pollution from reactive nitrogen (N) compounds on statutory nature conservation sites. They complement physical monitoring of atmospheric concentrations and deposition and risk assessment based on the critical loads approach by providing site-based information on atmospheric N concentrations, N deposition and/or ecological impacts.