NEET 2002 Biology question

Not in NEET syllabus

Which of the following is absent in polluted water : -

(1)Hydrilla
(2)Water hyacinth
(3)Larva of stone flyCorrect
(4)Blue green algae

Answer: (3)

Solution

Organisms such as the larva (nymph) of stone fly, mayfly and caddis fly need clean, well-oxygenated water, so they are biological indicators of unpolluted water and are absent when water is polluted (low dissolved oxygen, high

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Question ID VK-089080