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.
Related Questions
The set up shown alongside was kept in sunlight for an hour. It was observed that drops of water appeared on the inside surface of the polythene bag.
(a) Name the process which is being demonstrated.
(b) Why was the pot with its soil left uncovered by the polythene bag?
(c) Why was the pot left in sunlight?
(d) Suppose that the pot in this experiment was placed inside a dark room instead of placing it in sunlight for some time. What difference would be noticed?
Briefly explain, how transpiration helps in the upward conduction of water in plants?
Given alongside is an experimental set up. Study the figure and answer the following questions:
(a) What is the main objective of the experiment?
(b) Name the tissue which is responsible for the process shown in the figure.
(c) Name two dyes which can be used in the above experiment to make a coloured solution.
How does temperature, light intensity and wind affect transpiration?