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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
Differentiate between Diffusion and Osmosis (Definition)
A candidate in order to study the process of osmosis has taken 3 potato cubes and put them in 3 different beakers containing 3 different solutions. After 24 hours, in the first beaker the potato cube increased in size, in the second beaker the potato cube decreased in size and in the third beaker there was no change in the size of the potato cube. The following diagram shows the result of the same experiment:
(i) Give the technical terms of the solutions used in beakers, 1, 2 and 3.
(ii) In beaker 3, the size of the potato cube remains the same. Explain the reason in brief.
(iii) Write the specific feature of the cell sap of root hairs which helps in absorption of water.
(iv) What is osmosis?
(v) How does a cell wall and a cell membrane differ in their permeability?
What is responsible for guttation?
Name the following:
The condition of a cell placed in a hypotonic solution.
Give the equivalent terms for the following:
Pressure of the cell contents on the cell wall
Differentiate between the following:
Plasmolysis and deplasmolysis
Two potato cubes each 1 cm3 in size, were placed separately in two containers (A&B), the container (A) having water and the other (B) containing concentrated sugar solution. After 24 hours when the cubes were examined, those placed in water were found to be firm and had increased slightly in size and those placed in concentrated sugar solution were found to be soft and had somewhat decreased in size. Use the above information to answer the questions that follow:
Account for the firmness and increase in the size of the potato cubes placed in water.
Show by a series of diagrams, the change which a plant cell will undergo when placed in
Hypertonic salt solution
Distinguish between the following:
Turgor pressure and osmotic pressure
Name the following:
Two solutions having same concentrations.
Explain why:
Bacteria and fungi do not grow in pickles, jams, jellies and squashes.
What is the significance of diffusion?
Give Reasons for the following.
Drops of water on a leaf of plant like peepal does not enter the leaf by osmosis?
Give Reasons for the following.
Plants begin to die when the excess of soluble fertilizers are added to the soil?
Given below is the figure of an experimental set up to demonstrate root pressure.
(i) Define root pressure.
(ii) What change would you observe in the water level after some time?
(iii) What role is being played by the root pressure in the given experiment?
(iv) Why the oil has been sprinkled on water?
Give Technical Term for the following.
The condition in which the water from a cell is completely removed due to exosmosis and no more shrinkage is possible.
Name the following:
The process by which raisins swell up when placed in a beaker of water.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
The plasma membrane permits the passage of all solutes and water.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Cells that have lost their water content are said to be deplasmolysed.
Explain the Term: Endosmosis
