Describe an activity to demonstrate endosmosis and exosmosis. Draw a diagram also.

Activity to show endosmosis and exosmosis:
Put dried raisins in plain water and leave them for some time. Then,place these swollen raisins into a concentrated salt solution.
Observation:
$(i)$ When dried raisins are placed in plain water,they swell up due to the osmotic entry of water into the raisins. Plain water acts as a hypotonic medium for the raisins.
$(ii)$ When the swollen raisins are transferred to a concentrated salt solution,they shrink again. The concentrated solution acts as a hypertonic medium for the swollen raisins. Exosmosis occurs,and the raisins lose water.