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Question Question 5(iii)
In an experimental set up pieces of dry cobalt chloride paper are attached to the two surfaces of a dicot leaf and held in position by two glass slides on either side tied-together by elastic bands or hold by clips. The leaf remain attached to its own plant. What will be your observation after some time?
The piece of paper which is facing the upper surface of the leaf will not turn pink or turns pink in a much longer time and the one on the lower surface of the leaf turns pink, after some time. This shows that more transpiration takes place from the lower surface of leaf because of the numerous stomata found on it.