An indicator species of polluted waters is _________

Tubifex

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Phytoplankton

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Zooplankton

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Prawn

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Solution

The correct option is A Tubifex
A. Tubifex, also known as sludge worm or sewage worm, can survive in a eutrophic lake. Hence, it is considered to be a pollution indicator.
B. Phytoplankton are free floating autotrophic and microscopic marine algae.,
C. Zooplankton are the microscopic and heterotrophic organisms that drift in the oceans.
D. Prawn is a crustacean which is used as a source of food.
So, the correct answer is 'Tubifex'.

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