LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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You put raisins in a glass of water for an hour and they plump up.
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After washing dishes for an hour your fingers look wrinkled.
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Gargling with salt water when you have a sore throat causes your swollen throat cells to shrink and feel better.
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You can smell what your neighbor is cooking on the grill.
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Detailed explanation-1: -A phenomenon called endosmosis takes place when raisins are placed in water for few hours. When raisins are soaked in water, they swell. All this is due to the process of osmosis. The water molecules pass the cell membrane of the raisins and the raisins thus get swollen.
Detailed explanation-2: -Raisins swells because of osmosis. Solution outside the raisin has a higher concentration of water molecules. Therefore, water from outside enters the raisin through the process of osmosis and hence the raisin swells up when kept in water.
Detailed explanation-3: -When raisins are placed in water they swell up due to endosmosis. The cells of the raisins have a low water concentration. This means that they absorb water and become turgid.
Detailed explanation-4: -Reason: Pure water has very very little solute concentration than the raisin, so osmosis occurs, water enters the raisin, and raisin swells up (It is also called end osmosis or deplasmolysis). Osmosis is defined as there is a movement of particles from a region of higher concentration to that of lower concentration.
Detailed explanation-5: -The vitamins and minerals present on the outer skin of the raisin get dissolved in the water. Thus the amount of nutrients that will be absorbed by the body increases. This is especially beneficial for people suffering from high blood pressure. This way, the antioxidant content too gets enhanced.”