Give the significance of plasmolysis.
Plasmolysis is useful in the following ways:

1. It helps in recognition whether the cell is living or dead.

2. It helps in killing weeds. The concentrated solution of NaCl is sprayed over weeds which get killed due to plasmolysis.

3. Plasmolysis is used in preservation of food materials. Pickles and jams have more NaCl and sugar content respectively so that they must remain protected from the attack of fungus, spores, bacteria etc.

4. With the help of plasmolysis, the plants growing in crevices of walls of houses can be killed by adding hypertonic solution.