Procedure : Make a cup shaped cavity in the potato as shown in figure four Sugar solution in to the cavity place the potato in a container half immersed in water. Mark the level of sugar solution. Leave it for about half an hour. Note the rise in the level of sugar solution. It is due to the movement of water molecules from a region of higher concentration to a region of lower concentration through the semipermeable membrane of the. potato. This process is called ‘osmosis’ osmosis is a special kind of diffusion.
