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Diffusion and Osmosis

Fresh water b...

Question

Fresh water bony fishes maintain water balance by

A

Excreting a 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 wastes in the from of uric acid

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Solution

The correct option is A Excreting a hypotonic urine
Fresh water bony fishes take a large amount of water. To get rid of excess water, they pass out hypotonic urine (which is more dilute than blood plasma).

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