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प्रश्न
Explain the term:
Diffusion
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उत्तर
- Diffusion means to disperse.
- Diffusion can be defined as the movement of ions/ atoms/ molecules of a substance from the region of their higher concentration to the region of their lower concentration till equilibrium is reached.
- The movement is due to the kinetic energy of the molecules.
- Water passes into the cell by diffusion through a freely permeable cell wall.
संबंधित प्रश्न
Osmosis and diffusion are the same except that osmosis there is:
Give the equivalent terms for the following:
Pressure of the cell contents on the cell wall
Define the following:
Hypertonic solution
Distinguish between the following:
Hypotonic and Hypertonic solutions
Explain why:
Bacteria and fungi do not grow in pickles, jams, jellies and squashes.
Choose the correct answer:
If a marine plant is transferred to fresh water, it bursts due to ___________
What is the water potential?
Give Reasons for the following.
Salt and sugar are used in preserving food.
Give Reasons for the following.
Freshwater fish cannot survive in seawater.
Give Reasons for the following.
Plants begin to die when the excess of soluble fertilizers are added to the soil?
Differentiate between:
Osmosis and Diffusion
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.
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?
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
During exosmosis, water moves from inside the cell to the outside of the cell.
Fill in the Blank
A plasmolysed cell has __________ protoplast.
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.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Plasmolysis makes the cell turgid.
Multiple Choice Question:
When a plant wilts, the sequence of events will be as follows:
Define the following term:
Osmotic Pressure
