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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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संबंधित प्रश्न
The bending movements of certain flowers towards the sun and the sleep movements of certain plants at night are examples of ______.
When placed in a more concentrated solution, the cell contents will ______.
(a) Mention whether the following statement is true (True) or false (False)
(b) Correct the false statement by altering the last word only.
A plant cell placed in hypotonic solution gets Plasmolysed.
Show by a series of diagrams, the change which a plant cell will undergo when placed in
Hypertonic salt solution
Give Reasons for the following.
Plants growing in fertilized soil are often found to wilt if the soil is not adequately watered. Why?
A plant cell kept in a drop of water was examined under the low power magnification of a microscope, as shown:
(i) What would you do to bring this cell back to its original condition?
(ii) What scientific term is used for such condition?
(iii) Draw the same cell if it is kept in a strong sugar solution.
The diagram below represents an experimental set up to demonstrate a vital process. Study the same and then answer the questions that follow:
(i) Name the process.
(ii) Define the above named process.
(iii) What would you observe in the experimental setup after an hour or so?
(iv) What control experiment can be set up for the above experiment?
(v) Keeping in mind the root hair cell and its surrounding name the part that corresponds to (1) Concentrated sugar solution, (2) Parchment paper, (3) Water in the beaker.
(vi) Name any other substance that can be used instead of parchment paper in the above experiment.
(vii) Mention two advantages of this process to the plant.
Fill in the Blanks
Diffusion is the movement of molecules from a region of their ________ concentration to the region of their ________ concentration.
Fill in the Blanks
Osmosis in the diffusion of _______ molecules from the region of higher _____ potential to that of lower potential across a S.P.M.
Multiple Choice Question:
Osmosis involves:
