Which of the following is absent in polluted water ?

Monjur Alahi

Which of the following is absent in polluted water ?
A. Hydrilla
B. Water hyacinth
C. Larva of stone fly
D. Blue-green algae


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Salim Ahmed Kawsar

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Correct Answer - C
Stone flies are exopterygote insects with aquatic nymphs, long antennae, biting mouth parts and weak flight. Adults have the tendency of feed on lichens and unicellular algae. These are good pollution indicators.

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