NEET BIOLOGY

ECOLOGY

ORGANISMS AND THE ENVIRONMENT

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What can happen to fish when there is not enough oxygen in the water?
A
They can suffocate
B
They can’t float
C
They can’t see.
D
Nothing. Fish don’t need oxygen.
Explanation: 

Detailed explanation-1: -Though some fish can breathe on land taking oxygen from air, most of the fish, when taken out of water, suffocate and die. This is because gill arches of fish collapse, when taken out of water, leaving the blood vessels no longer exposed to oxygen in air.

Detailed explanation-2: -Do fish feel pain when they suffocate? Fish out of water are unable to breathe, and they slowly suffocate and die. Just as drowning is painful for humans, this experience is most likely painful for fish.

Detailed explanation-3: -Fish can drown. While it may not seem like it, fish do require oxygen to breathe; it’s just that they get what they need from the oxygen dissolved in water rather than in the air. Too little oxygen spells trouble for our finned friends, which have to move or else suffer ill effects. Fish can drown.

Detailed explanation-4: -According to Collins Concise Dictionary, drowning is “to die or kill by immersion in liquid” – so no, fish cannot drown. However, they can suffocate when fresh water does not contain enough dissolved oxygen – either as a result of eutrophication (an excess of nutrients) or drought.

Detailed explanation-5: -When the water doesn’t have oxygen, they suffocate, just like humans suffocate when we don’t breathe enough oxygen. So, while a fish can’t die from drowning in water, it can die from suffocating in water due to a lack of oxygen.

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