Biology
The diagram below represents a process in plants. The set up was placed in bright sunlight. Answer the following questions:
(i) Name the physiological process depicted in the diagram. Why was oil added to the water?
(ii) When placed in bright sunlight for four hours, what do you observe with regard to the initial and final weight of the plant? Give a suitable reason for your answer.
(iii) What happens to the level of water when this setup is placed in:
- Humid conditions?
- Windy conditions?
(iv) Mention any three adaptations found in plants to overcome the process mentioned in (i).
(v) Explain the term 'Guttation'
Transpiration
ICSE 2018
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Answer
(i) Transpiration process is depicted in the diagram. Oil was added to the water in order to prevent the loss of water by evaporation.
(ii) When placed in bright sunlight for four hours, the final weight of the plant will be lesser than the initial weight because some water will be lost from the aerial parts of the plant by transpiration.
(iii) The the level of water is affected as below:
- Humid conditions — Slight or no drop in water level.
- Windy conditions — Drop in level of water in the jar as rate of transpiration increases.
(iv) Three adaptations found in plants to overcome transpiration are:
- Sunken stomata
- Narrow leaves
- Reduced exposed surface by rolling or folding of leaves.
(v) Loss of water in the form of droplets from the margins (hydathodes) of leaves is called guttation.
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