Question

22. Given below is an experimental set-up to demonstrate a particular process. Study the same and answer the questions that follow:
(i) Name the physiological process being studied.
(ii) Explain the process mentioned above.
(iii) What is the aim of the above experiment?
(iv) What would you observe in the experimental set up after an hour ? Give a reason to support your answer.
(v) Mention any three adaptations found in plants to overcome the physiological process mentioned in (i) above.​

Answer 1

Explanation:

(i) Transpiration

(ii) Two cobalt chloride papers are attached, one on the dorsal and the other on the ventral surface of a dorsiventral leaf with the help of glass slide and clips. The set up is left in the open for few hours.

(iii) To show that more transpiration occurs from the ventral surface of a dicot leaf.

(iv) After an hour, the cobalt chloride paper placed on the ventral surface turns blue to pink faster than the one on the upper surface as the number of stomata are more on the ventral surface, so more transpiration takes place from the lower surface.

(v) 1. Cuticle becomes thick

2. Leaves become narrow

3. Stomata covered by hair-like structures