During summer, water kept in an earthen pot becomes cool because of the phenomenon of:
Evaporation
An explanation for incorrect answer:
a. Diffusion is the random motion of molecules that generally moves from higher concentration to lower concentration. Earthen pot does not follow this method for cooling water. Hence it is incorrect.
b. Transpiration is the cycle where plants assimilate water through the roots and afterward offer water to the atmosphere through pores in their leaves. This process is not used by the pot to cool water. Hence it is incorrect.
c. Osmosis -The passage or diffusion of water or other solvents through a semipermeable membrane is called osmosis. This process is not used by the pot to cool water. Hence it is incorrect.
An explanation for the correct answer
d. Evaporation is the process in which liquid is converted into vapour. And this process is used by the earthen pot to cool down the water earthen pot has a small pore present on the walls and the water oozes out slowly and it uses the heat of the water to evaporate. Hence it is correct.
Hence the correct option is D.