Osmosis is the movement of the solvent molecules from a region of its higher concentration to a region of low concentration across a semipermeable membrane. That is when the two solutions are separated from each other by a semipermeable membrane. The osmosis is of two types based on the direction of movement across the cell that is endosmosis and exosmosis. The exosmosis occurs when the solvent molecules move from the cell to the outside so that the shrinking of the protoplasm results in the plasmolysis. This occurs since the protoplasm have higher concentration of the water molecules than outside. So exosmosis results in the plasmolysis of the cell; the plasmolysed cell can be made to normal cell by the process of endosmosis.