Question

Study the diagram given below and answer the questions that follow
(i) Name the process being studied in the above experiment.
(ii) Explain the process mentioned in (i) above.
(iii) Why is oil placed, over water?
(iv) What do observe with regard to the we level of water when this set up is placed in (1) bright sunlight (2) humid conditions (3) windy day?
(v) Mention any three adaptations found in plants to overcome the process mentioned in (ii) above.

Answer 1

Q1) Name the process being studied in the above experiment.

Ans: Transpiration

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Q2) Explain the process mentioned in (i) above

Ans: Transpiration is the process of loss of water vapour from aerial parts of plant

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Q3) Why is oil placed, over water?

Ans: Oil is placed over water to prevent direct evaporation of water

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Q4) What do observe with regard to the we level of water when this set up is placed in

(1) In bright sunlight - The level of water will fall faster

(2)In humid conditions - The level of water will fall very slowly

(3) On a windy day - The level of water falls faster

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Q5) Mention any three adaptations found in plants to overcome the process mentioned in (ii) above.

Ans:

• The cuticle is very thick
• The leaves are absent or reduced to spines.
• Stomata are covered by hair or Stomata located in pits

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Answer 2

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(i) Transpiration

(ii) It is the process by which plants lose water as vapours through the aerial parts.

(iii) To prevent evaporation of water from the test tube.

(iv) 1. In bright sunlight the level of water decreases quickly.

2. In humid conditions level of water does not decrease for a long time.

3. On windy day level of water decreases very quickly.

(v) 1. The number of stomata may be reduced.

2. leaves may become narrow.

3. A thick layer of cuticle on the leaf surface help to decrease transpiration.