LABORATORY REVIEW
DIFFUSION AND OSMOSIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Water will move out of the onion cells and the cells will shrink.
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Water will move out of the onion cells and the cells will swell.
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Water will move into the onioncells and the cells will swell.
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Detailed explanation-1: -It is possible to observe the plasmolysis of cells under the microscope. When salt water is added to onion cells, then the cells will lose water due to osmosis, this can be observed.
Detailed explanation-2: -If a cell is placed in a hypertonic solution, water will leave the cell, and the cell will shrink. In an isotonic environment, there is no net water movement, so there is no change in the size of the cell. When a cell is placed in a hypotonic environment, water will enter the cell, and the cell will swell.
Detailed explanation-3: -If a cell encounters a hypotonic environment, (like pure water for instance), water will diffuse into the cell and the cell will begin to swell. This can of course lead to an explosion of sorts.
Detailed explanation-4: -Once placed in a solution of 100 percent water, the water molecules in the solution will go from a high concentration to a low concentration in the red blood cell, causing the cell to swell and burst.