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?
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Solution

(i) In plant (c), the water would move up the fastest because of greater transpiration by the leaves due to the strong light.

(ii) In plant (b), the water would move up slowly because there are no leaves and transpiration does not occur.

(iii) The water was covered with a layer of oil to prevent any water loss due to evaporation.

(iv) The ascent of sap by transpiration pull is being investigated by this experiment.

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Figure

An apparatus as shown below was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow :

(a) Name the process being studied.

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(e) Mention two ways in which this process is beneficial to plants.

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What hypothesis is being tested in this experiment?

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