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:
(i) Name the process being studied.
(ii) Explain the process named above in Q.3 (a) (i).
(iii) Why was the pot covered with a plastic sheet?
(iv) Suggest a suitable control for this experiment.
(v) Mention two ways in which this process is beneficial to plants.
(vi) List three adaptations in plants to reduce the above mentioned process.
Transpiration
ICSE 2015
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Answer
(i) Transpiration
(ii) Transpiration is the loss of water in the form of water vapour from the aerial parts of the plants like leaves, stems, etc. The water vapour is released from tiny openings called stomata, present on the aerial parts of the plant.
(iii) The pot is covered with a plastic sheet to prevent evaporation of water from the soil.
(iv) A control for this experiment will be an empty polythene bag with its mouth tied and kept in sunlight. It will show no droplets of water inside.
(v) 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.
(vi) Three adaptations in plants to reduce transpiration are:
- Sunken stomata.
- Narrow leaves.
- Reduced exposed surface by rolling or folding of leaves.
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