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.
Root pressure : It is a positive force. It is due to the osmosis of water, from the soil into the root cells and the active pumping of salts into the xylem tissue, which maintains a concentration gradient along which the water will move. It is responsible for the ascent of sap to small heights.
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