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Which of the following is absent in polluted water ?A. HydrillaB. Water hyacinthC. Larva of stone flyD. Blue-green algae |
Answer» 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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