Three plants A, B and C are placed in beakers containing coloured water. The water in each beaker is covered with a layer of oil. The leaves were removed from plant B, while plant C was exposed to a strong light. [5 MARKS]

(a) In which plant A, B or C, would the water move up fastest? Give a suitable reason for your answer.
(b) In which plant would water move slowly?
(c) Why is the water covered with oil?
(d) What is being investigated in this experiment?

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Solution

a) 2 Marks
b) 1 Mark
c) 1 Mark
d) 1 Mark

(a) The water would move up fastest in plant C. The presence of strong light enhances the rate of transpiration through the stomata as a result of which water moves fastest from roots to leaves.
(b) In plant B, water would move slowly.
(c) The water is covered with oil to prevent the evaporation of water from the surface.
(d) The intensity of light has a direct effect on the rate of transpiration, e.g. strong light increases the rate of transpiration which results in the rapid absorption of water by roots.

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Q. Three plants (a), (b) and (c) were placed in beakers containing coloured water. The water in each beaker was covered with a layer of oil. The leaves were removed from plant (b), while plant (c) was exposed to strong light.
(i) In which plant, (a), (b) or (c) would the water move up the fastest?
(ii) In which plant (a), (b) or (c), would the water move up slowly?
(iii) Why was the water covered with a layer of oil?
(iv) What is being investigated by this experiment?
Figure

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