Transport of water between cells and their environment
Transport of water between cells and their environment
Transport of water between cells and their environmentWhat will happen to an animal cell or a plant cell placed in a sugar or salt solution in water? Osmosis will take place and the movement of water molecules will depend on the concentration of the surrounding solution.1. In a hypotonic (dilute) solution, the cell will gain water by osmosis. This is because there is a higher water concentration outside the cell. The cell sap, or cytoplasm, has less water molecules than the outer solution. Water molecules pass in both directions across the cell membrane. But more water enters the cell than goes out of it. So the net movement of water is into the cell, due to which the cell increases in volume, or swell up. This is called endosmosis.2. When the cell is placed in an placed in an isotonic solution, which has exactly the same water concentration as the cell, there will be no net movement of water molecules across the cell membrane. Although water passes the cell membrane in both directions, the amount coming in is the same as the amount going out. So there is no net movement of water and the cell remains the same size.3. When the cell is immersed in a hypertonic (very concentrated) solution, water will diffuse out of the cell by osmosis. This is because there is a low concentration of water outside the cell. Although water molecules pass the cell membrane in both directions, more water goes out of the cell than enters it. As a result, the cell will shrink. This process is called exosmosis. If exosmosis continues in a plant cell, the cytoplasm would appear shrunken. This is called plasmolysis and cell is said to be plasmolysed.
Which of the following are correct : (a) In a hypotonic solution, the cell will gain water by osmosis because there is a higher water concentration outside the cell. (b) In a hypertonic solution, the cell will gain water by osmosis because there is a higher water concentration outside the cell. (c) When the cell is immersed in a hypertonic solution, water will diffuse out of the cell by osmosis. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct : (a) In a hypotonic solution, the cell will gain water by osmosis. This is because there is a higher water concentration outside the cell. (b) In a hypertonic solution, the cell will gain water by osmosis. This is because there is a higher water concentration outside the cell. | |||
| Right Option : A | |||
| View Explanation | |||
When the cell is placed in an _________________ solution, which has exactly the same water concentration as the cell, there will be no net movement of water molecules across the cell membrane. | |||
| Right Option : B | |||
| View Explanation | |||
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