Biology
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?
Answer
Test tube A contains plant, therefore, the water level in test tube A falls because the water is absorbed by the plant through the roots dipped in the water. Since the test tube contains oil, no water loss occurred due to evaporation because oil prevents water molecules from evaporating. In test-tube B the water level remains the same because there is no plant present as well as oil refrains the water to evaporate.
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