Which of the following is a freshwater indicator organism?

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Sludge worm

All of the above

Tubifex

Daphnia

answer is B.

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Detailed Solution

Daphnias also referred to as water fleas, are tiny planktonic crustaceans.
They serve as freshwater bioindicators.
Bioindicators are organisms whose abundance and pattern of development reveal alterations in their environment.
Their migratory patterns, feeding preferences, or rate of organism mortality vary as a result of contamination with inorganic solvents or radioactive elements in the water body.
Due to their limited lifespan, these creatures are investigated as bioindicators. To get rid of some dangerous germs, the drinking water needs to be treated.
Examples of freshwater indicators include Daphnia, trout fish, and stonefly larvae, while signs of contaminated water include tubifex, sludge worms, sewage fungus, and blood worms, E. Coli.

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