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प्रश्न
Explain the difference between osmosis and diffusion.
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उत्तर
| Sr. No. | Diffusion | Osmosis |
| 1. | It is the movement of molecules of a substance from a region of higher concentration to a region of lower concentration. | It is the process in which water molecules move through a semi-permeable membrane from a region of higher concentration to a region of lower concentration. |
| 2. | Diffusion involves the free mixing of the solution without a semipermeable membrane. | Osmosis involves the use of a semipermeable membrane. |
| 3. | In diffusion, both solvent and solute molecules move directly into each other. Thus, it is a bilateral process. | In osmosis only solvent molecules move through the semipermeable membrane. The movement of solute particles is checked by the semipermeable membrane. |
| 4. | It is shown by solutions as well as by gases. | It is shown by solutions only. |
| 5. | It can neither be stopped nor reversed. | It can be stopped or reversed by applying external pressure on the solution having a higher concentration. |
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In an experiment, two sets of apparatus were set up as shown below:
In A there is a concentrated sugar solution inside the thistle funnel and red ink in the water outside the funnel. In B there is a concentrated glucose solution with red ink inside the thistle funnel and water outside the thistle funnel.
In both A and B the level of liquid inside the funnels rises up the tubes. In A the sugar solution turns red and in B, the water turns red.
Study the given observations and answer these questions:
- Name the process by which red ink moves in A and B.
- Which type of pressure forces the water molecules to move towards thistle funnels and cause a rise in the water level?
- Where does this process occur in plants and animals?
- What material could be used as a semi-permeable membrane?
Explain the Term:
Osmosis
Explain the term:
Plasmolysis
