Take a potted plant.

Cover it by polythene so that its roots along with soil get completely covered. This will prevent evaporation of water from the soil.

Put a bell jar over the potted plant.

Apply vaseline on the rim of the jar, this will prevent air from entering the jar from outside.

Keep this set-up in the sunlight for some time.

You will find drops of water on the inner side of the bell jar. These drops are due to the process of transpiration.