Q. The external solution having same concentration as that of cell sap is called
NTA AbhyasNTA Abhyas 2020
Solution:
Osmosis is a process of movement of a solvent across a semipermeable membrane, from lower DPD to higher DPD. This process was discovered by Pfeffer. When the water moves out of the cell, it is called Exosmosis, which makes the cell shrink. When water moves inside the cell, it is called Endosmosis, which makes the cell swell.
The solution, in which a cell is dipped, can be categorized into three main categories:
- If the concentration of a given solute is higher in the solution, in which the cell is placed, as compared to cell sap, it is called a Hypertonic solution. The cell, when placed in this, tends to lose water and shrink (Plasmolysis occurs).
- If the concentration of a given solute is lower in the solution, in which the cell is placed, as compared to cell sap, it is called a Hypotonic solution. The cell, when placed in this, tends to absorb water, and swell (Deplasmolysis occurs).
- If the concentration of a given solute is the same in the solution, in which the cell is placed, with the cell sap, it is called Isotonic solution. In this case, the rate of loss of water is exactly the same as that of absorption. Thus, there is no change in the shape of the cell. There is a dynamic equilibrium.
The solution, in which a cell is dipped, can be categorized into three main categories:
- If the concentration of a given solute is higher in the solution, in which the cell is placed, as compared to cell sap, it is called a Hypertonic solution. The cell, when placed in this, tends to lose water and shrink (Plasmolysis occurs).
- If the concentration of a given solute is lower in the solution, in which the cell is placed, as compared to cell sap, it is called a Hypotonic solution. The cell, when placed in this, tends to absorb water, and swell (Deplasmolysis occurs).
- If the concentration of a given solute is the same in the solution, in which the cell is placed, with the cell sap, it is called Isotonic solution. In this case, the rate of loss of water is exactly the same as that of absorption. Thus, there is no change in the shape of the cell. There is a dynamic equilibrium.