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Excretory System in Animals

Freshwater bo...

Question

Freshwater bony fishes maintain water balance by

A

Excreting hypotonic urine

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B

Excreting salt across their gills

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C

Drinking small amount of water

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D

Excreting waste in the form of uric acid

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Solution

The correct option is A Excreting hypotonic urine
In freshwater fishes, water will diffuse into the fish, so it excretes a very hypotonic or dilute urine to expel all the excess water. Gills absorb salt to compensate for salt lost in urine. This is how they maintain water balance.
Thus, the correct answer is option A.

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