The figure given below represents an experimental setup with a weighing machine to demonstrate a particular process in plants. The experimental setup was placed in bright sunlight. Study the diagram and answer the following questions:
(i) Name the process intended for study.
(ii) Define the above mentioned process.
(iii) When the weight of the test tube (A & B) is taken before and after the experiment, what is observed? Give reasons to justify your observation in A & B.
(iv) What is the purpose of keeping the test tube B in the experimental setup?
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(i) Transpiration.
(ii) Transpiration is the process in which water is lost in the form of vapour from the aerial parts of the plant.
(iii) Weight of test tube A before the experiment was more than its weight after the experiment. This is because water from test tube A has evaporated due to transpiration.
Weight of test tube B remains the same before and after the experiment, because no loss of water occurs in test tube B as there is no plant and the oil on the surface prevents direct evaporation of water.
(iv) It is a control experiment where the purpose of using test tube B is to compare the level of water in both test tubes.