The given diagram represents the set-up at the start of a certain experiment to demonstrate an activity of plants. [5 MARKS]
(a) What is the aim of the experiment?

(b) Why has oil been put in each test tube?
(c) What will be the observation in the two test tubes after about 2 to 3 days?
(d) Give a reason to explain any change observed as answered in (c) above.
(e) Why is test tube B without a plant taken in the experiment?

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Solution

Each Part: 1 Mark

(a) The aim of the experiment is to demonstrate transpiration.
(b) Oil has been put to prevent evaporation of water from the surface water.
(c) The level of water in test tube A will fall but there will be no change in the level of water in test tube B.
(d) The change in the water level of test tube A takes place due to absorption of water by roots.
(e) The test tube B is taken to demonstrate a control experiment showing that water is lost from the plants by transpiration.

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