What is Osmosis?
Movement of water molecules from the region of higher concentration to the region of lower concentration of molecules through semi-permeable membrane until equilibrium is attained is called osmosis.
What is plasmolysis?
When a cell is placed in a hypertonic solution, the water present in the cell flows outwards to maintain the concentration gradient due to which the cytoplasm of the cell loses water and shrinks, this is called palsmolysis.