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Question
An experiment was set up as shown in the figure below. After some time, the Water level in test tube A fell down but not in test tube B.
Why was there a fall in the water level of test tube A and not in that of test-tube B?
Solution
Test tube A contains a plant, so the water level falls as the plant absorbs water through its roots, which are submerged in the water. Since there is a layer of oil in the test tube, water loss due to evaporation does not occur, as the oil prevents water molecules from evaporating.
In test tube B, the water level remains unchanged because there is no plant to absorb the water, and the oil layer also prevents any evaporation.
The difference in water levels between the two test tubes demonstrates water is absorbed by the plant through the roots dipped in the water, which leads to a fall in the water level in test tube A. In contrast, test tube B shows no change in water level without any plant.
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