Question

4. The apparatus shown above is a setup to
demonstrate a particular process occurring in
green plants. Study it and then answer the
questions that follow:
a–name the process
b– what is the objective of the experiment ?
c–why is soda line placed in the tube?
d– what change, if any, would you observe in the Lime water in flask a and in flask b ?
In each case give reason for your answer.
e– mention one precaution that should be taken to ensure more accurate results ?
f–give an overall balanced chemical equation to present the process ?​

Answer 1

(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

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