Ques. Which one of the following is not a bioindicator of water pollution?
A. Blood-worms
B. Stone flies
C. Sewage fungus
D. Sludge-worms
Answer:B
Ques. Which one of the following is not a bioindicator of water pollution?
A. Blood-worms B. Stone flies C. Sewage fungus D. Sludge-worms