Demonstrate the phenomenon of transpiration.
Transpiration is the evaporation of water from the surface of leaves through stomata. The phenomenon of transpiration can be explained by Bell jar experiment.
REQUIREMENTS:
- Bell jar
- Well watered potted plant
- Rubber sheet
- Glass plate
PROCEDURE:
- Take the well watered potted plant and cover it with the rubber sheet. The aerial parts of the plant should be left uncovered.
- Put the plant on the glass plate and cover with the bell jar.
- Prepare a same setup but without a plant in the second bell jar.
- Place the apparatus in sunlight for sometime.
OBSERVATIONS:
Water drops appear inside the walls of the bell jar containing potted plant whereas no water drops appear in the bell jar without a plant. This demonstrates that water is evaporated from the surface of leaves in presence of sunlight.