When a plant cell is placed in a hypertonic medium, it loses water by osmosis. The osmotic pressure of the cell is lower than that of the medium.
The vacuole decreases in size and the cytoplasm shrinks as a result of which the cell membrane loses contact with the cell wall. The cell becomes flaccid.This process is described as plasmolysis.
NECTA 2013， BIOLOGY P 1.
Question 6 (a) Give the meaning of osmosis and diffusion.
b. Briefly explain how the following illustrates osmosis
(i) Shrinking of a cell when immersed in a high concentrated solution.
(ii) Bursting of red blood cell when immersed in dillute solution.