Biology
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.
(b) Explain the process named above in (a).
(c) Why was the pot covered with a plastic sheet?
(d) Suggest a suitable control for this experiment.
(e) Mention two ways in which this process is beneficial to plants.
(f) List three adaptations in plants to reduce the above mentioned process.
Transpiration
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Answer
(a) Transpiration
(b) Transpiration is a process during which water is lost in the form of water vapour through aerial parts of the plant.
(c) The pot is covered with a plastic sheet to prevent evaporation of water from the soil.
(d) A control for this experiment will be an empty polythene bag with its mouth tied.
(e) Transpiration is beneficial to plants in the following ways:
- It creates a suction force in the stem which enables the roots to absorb water and minerals.
- It helps in cooling the plant in hot weather.
(f) Some plants have developed adaptations to reduce transpiration to cut down loss of water such as:
- Sunken stomata
- Narrow leaves
- Reduced exposed surface by rolling or folding of leaves.
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