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1) name the phenomenon being demonstrated.
2) what is the purpose of putting oil in the test tube.
3) what is the purpose of the spring balance in the set up.
4) would it make a difference if the experimental set up is kept in bright sunlight.

Dear Student,
1.Transpiration is the process involved.
2. It is to cut off the connection of the surface of the water with the air, so that evaporation does not take place .As oil acts as an insulating layer between them.
3. It is to demonstrate the change in the weight of the test tube due to the loss of water by transpiration.
4.The rate of transpiration will accelerate if kept in bright sunlight.
Hope it helps
Regards
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1)Transpiration.
2)so that evaporation of water does not take place from surface.
3)To demonstrate the amount of water lost during the process.
4)The rate of transpiration will increase.
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1. Transpiration.
2. To cut off the connection of the surface of the water with the air, so that evaporation does not take place as oil acts as an insulating layer.
3. To demonstrate the change in the weight of the test tube due to the loss of water by transpiration.
4.The rate of transpiration will accelerate.
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