Which of the following is absent in polluted water?
Correct answer: C. Larva of stone fly
- A. Hydrilla
- B. Water hyacinth
- C. Larva of stone fly
- D. Blue green algae
Explanation
Stoneflies are extremely sensitive to water pollution. Their presence in a water body is an indicator of good water quality, while their absence may signal pollution or habitat degradation. Their sensitivity makes them valuable for assessing the health of freshwater ecosystems.
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