LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The cells of the fish were dehydrated by a quick loss of water
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The fish reached old age coincidentally
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The cells of the fish absorbed more water than he was able to
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The stress from moving aquariums got to the fish
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Detailed explanation-1: -The body of a marine fish has high concentration as compared to fresh water and so water enters the fish’s body through endosmosis and may lead to bursting of cells and death of the fish. Thus marine water fishes cannot survive in fresh water.
Detailed explanation-2: -If a marine fish is placed in a freshwater aquarium, then its chances of survival will diminish. This is because their bodies are adapted to high salt concentrations of the marine environment. In freshwater conditions, they are unable to regulate the water entering their body (through osmosis).
Detailed explanation-3: -All fish need an element of salt in the water. Koi carp need between 0.13 and 0.23% of salt in the water. The salt is drawn into their system via osmosis and keep the balance. If salt or freshwater fish are in the wrong water, salt will be drawn in or out of the body and kill the fish.