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Which one of the following is not a bioindicator of water pollution ?A. Sludge wormsB. Blood wormsC. Stone filiesD. Sewage fungus |
Answer» Correct Answer - C Among the following stone flies are not bioindicators of pollution. Stone flies (e.g. Perla sp.) belong to order-Plecoptera of class - Insecta, which has the terrestrial mandibulates. |
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