The figure given below represents 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

Before - Weights of A and B are the same.
After - 'A' becomes lighter as it loses water due to transpiration, no change in 'B' as there is no loss of water due to evaporation as the surface of water is covered with oil.

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Q. 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 :
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(a) Name the process intended for study.
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Before - Weights of A and B are the same.After - 'A' becomes lighter as it loses water due to transpiration, no change in 'B' as there is no loss of water due to evaporation as the surface of water is covered with oil.

Before - Weights of A and B are the same.
After - 'A' becomes lighter as it loses water due to transpiration, no change in 'B' as there is no loss of water due to evaporation as the surface of water is covered with oil.