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Question

Which of the following is a freshwater indicator organism?


A

Daphnia

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B

Tubifex

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C

Sludge worm

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D

All of the above.

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Solution

The correct option is A

Daphnia


The correct option is A.

Explanation for Correct option:

  1. Daphnia are small planktonic crustaceans, commonly known as water fleas.
  2. They act as bioindicators for freshwater.
  3. Bioindicators are organisms whose number and development of features indicate changes in the environment.

Explanation for Incorrect options:

Option B:

Tubifex is the indicator of polluted water.

Option C:

Sludge Worm is the indicator of polluted water.

Final answer: Daphnia is a freshwater indicator organism


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