Q. Which one of the following is not a bioindicator of water pollution?
A) Sludge worms
B) Blood worms
C) Stone flies
D) Sewage fungus
Explanation
Stoneflies (e.g., Perla sp) belongs to order-Plecoptera of class-Insecta, which has the terrestrial mandibulates. These are not bio-indicators of water pollution.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.