Question

Study the diagram given alongside and answer the questions that follow:

(i) Explain the physiological process of being study.
(ii) What will be the observations in the two test-tubes after about 2-3 days?
(iii) Give a reason for your answer in (ii) above.
(iv) Why is the surface of water covered with oil?
(v) State the purpose of setting up test tube B.

Answer 1

(i) Transpiration: Loss of water as water vapour from aerial parts of the plant.
(ii) After 2-3 days the level of waterfalls in test-tube A while it remains constant in test tube B.
(iii) The fall in the level of water in test-tube A due to the absorption of water by the roots.
(iv) The oil has been put in each test-tube to prevent the loss of water by evaporation.
(v) The purpose of setting up test-tube B is to show that in the absence of a plant, there is no change in the level of water.