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ICSE Class 10 Biology Question 6 of 11

Absorption by Roots — The Process Involved — Question 1

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Question 1

Differentiate between the following :

(a) Plasmolysis and Deplasmolysis

(b) Turgor Pressure and Wall Pressure

(c) Hypotonic and Hypertonic solution

(d) Turgidity and Flaccidity

Answer

(a) Difference between Plasmolysis and Deplasmolysis

PlasmolysisDeplasmolysis
It refers to the shrinkage of the cytoplasm and withdrawal of the plasma membrane from the cell wall caused due to the withdrawal of water when placed in a hypertonic solution.Deplasmolysis is the recovery of a plasmolysed cell when it is placed in water, wherein the cell's protoplasm again swells up due to the re-entry of water.
In Plasmolysis, the cell becomes flaccid.In Deplasmolysis, the cell becomes turgid.

(b) Difference between Turgor pressure and Wall pressure

Turgor PressureWall Pressure
Turgor pressure is the pressure of the cell contents on the cell wall.Wall pressure is the pressure exerted by the cell wall on the cell content.
It helps keeps plant stems erect, keeps leaves expanded, involve in opening and closing of stomata, etc.It helps maintain the structure of cells and the plant.
It acts towards the outside from the cell.It acts towards the inside of the cell.

(c) Difference between Hypotonic and Hypertonic solution

Hypotonic SolutionHypertonic Solution
The solution outside the cell has a lower solute concentration than the fluids inside the cell.The solution outside the cell has higher solute concentration than the fluids inside the cell.
Endosmosis occurs as the water molecules move into the cell.Exosmosis occurs as the water molecules move out from the cell.
When placed in Hypotonic Solution, the cell slightly enlarges or even bursts.When placed in Hypertonic Solution, the cell shrinks in size and loses shape.

(d) Difference between Turgidity and Flaccidity

TurgidityFlaccidity
It is the state of a cell in which the cell wall is rigid and stretched by an increase in the volume of vacuoles due to the absorption of water.It is the condition in which the cell content is shrunken and the cell is not tight.
It occurs when the cell is placed in Hypotonic solution.It occurs when the cell is placed in Hypertonic solution.
It is caused by Endosmosis.It is caused by Exosmosis.
Water moves into the cell.Water moves out of the cell.