The figure given below represents an experimental set up with a weighing machine to demonstrate a particular process in plants. The experimental set up was placed in bright sunlight. Study the diagram and answer the following questions:
When the weight of the test tube (A and B) is taken before and after the experiment, what is observed?
Give reasons to justify your observation in A and B.
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Solution
After the experiment, we observe test tube A is raised up i.e., a loss of weight. In test tube B, the weight remains unchanged.
Reason: In test tube A, it loses weight due to the plant transpiring and losing water. In B there is no plant so there is no transpiration and the oil on the surface prevents direct evaporation and so the weight remains unchanged.
