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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About Man and His Environment
Ecosystems include biotic and abiotic components, food chains and webs, energy flow, nutrient cycles, populations and ecological relationships. Pollution and conservation cover air, water, soil and noise pollution, their effects on organisms, biodiversity loss, protected areas, sustainable resource use and methods for reducing environmental damage.
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