THE CELL
TRANSPORT INTO AND OUT OF THE CELL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The Elodea cells would increase in size.
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The Elodea cells would immediately enter into mitosis.
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The Elodea cells would decrease in size.
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The Elodea cells would immediately enter into meiosis.
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Detailed explanation-1: -If an elodea leaf is placed in a 1M concentration of salt solution, it would undergo plasmolysis. Plasmolysis is the process by which the internal contents of a plant cell shrink and aggregate when that cell is placed in a hypertonic solution.
Detailed explanation-2: -When the Elodea was placed in the salt solution, the vacuoles disappeared and the protoplasm came away from the cell wall making the organelles appear to be clumped in the middle of the cell. Such cells are said to be plasmolyzed.
Detailed explanation-3: -Placing Elodea cells into 100% water, which is more hypotonic than freshwater, also causes water movement into of the cells resulting in the swelling of the cells. In plants the outward pressure of the water produces rigidity of the cell, as the plasma membranes are pushed against the cell walls.
Detailed explanation-4: -Elodea cells, when placed in a hypertonic solution, will lose water through osmosis. This will make them flaccid. The central vacuole reduces and eventually disappears. The cell membrane pulls away from the cell wall and the organelles appear concentrated at the center of the cell.