A) Hydrilla
B) Eichhornia
C) Cynobacteria
D) Larva of stone fly
Correct Answer: D
Solution :
Stone flies are exopterygote insects with aquatic nymphs, long antennae, biting mouth parts and weak flight. Adult have the tendency to feed on lichen and unicellular algae and these are not found in polluted water. Hence, stone flies are also absent in polluted water.
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