Oxygen is present in air as well as in water. Then why do fishes die when taken out of water?

since the swimming action of fish is essential to take in oxygen

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since oxygen is in an ionic state in water which can be absorbed by gills

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since gills get ruptured and broken when coming in contact with air

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since gills cannot separate oxygen from hydrogen, when fish are outside water

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Solution

The correct option is D
since gills cannot separate oxygen from hydrogen, when fish are outside water

The gills of fish separate oxygen from hydrogen when the fish are in the water. When fish are removed out of water the gills cannot separate oxygen from hydrogen; as a result fishes die when they are taken out of water.

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Similar questions

Question 5
Fishes breathe with the help of gills which are richly supplied with blood vessels. The gills help the fish to

(a) take in oxygen from air.
(b) take in oxygen dissolved in water
(c) absorb nutrients present in water
(d) release waste substances in water

We take in oxygen present in air through our lungs. Fishes take in oxygen dissolved in water through their________.

Q. How do gills in fish help in breathing under water ?

Q. Fishes absorb the oxygen dissolved in water through their:

Q. Whales and dolphins like fishes live in water. But they do not have gills. How do they breathe?

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