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Answer.

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.

 

Refered Question.

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.

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