Q. 25.0( 3 Votes )
A leaf cell of a water plant was placed in a liquid other than pond water. After some time, it assumed a shape as shown below:
(a) Give the term for the state of the cell it has acquired.
(b) Comment on the nature (tonicity) of the liquid surrounding the cell.
(c) Redraw in the space provided, the diagram of the cell if it is soon placed in ordinary water for some time.
(a) The term for the state of the cell it has acquired in the given diagram is plasmolyzed.
A plasmolyzed cell is the cell whose cell content has shrunken from its cell wall (in case of plant cells as shown in the diagram) due to exosmosis of water.
(b) Plasmolysis is the result of exosmosis of water thus; the tonicity of the liquid surrounding the cell is hypertonic.
A hypertonic solution is a solution surrounding the cell which has a higher solute concentration than the concentration of solutes inside the cell. Consequently, the water molecules from the interior of the cell will move out leading to the plasmolysis of the cell.
(c) If this plasmolysed cell is soon placed in ordinary water it will regain its turgidity and will be deplasmolysed.
Rate this question :