Question

Study the diagram given below and answer the question 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) Why do we observe with regard to the 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

(i) Transpiration

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

(iii) To prevent direct 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 helps to decrease transpiration.