Question

Four leaves of equal size were cut from the same plant. They were
weighed and then Vaseline was applied in the following ways before
leaving the set up for few days. Study the results of the above and
answer: [5]
Leaf A : Applied Vaseline on both surfaces
Leaf B : Applied Vaseline on lower surface
Leaf C : Applied Vaseline on upper surface
Leaf D : No Vaseline was applied.
(i) Define the phenomenon studied in this experiment?
(ii) Which leaf weighs the most and which one weighs the least?
(iii) Which leaf is least shrivelled and why?
(iv) How does the three - bell jar experiment offer a double visual proof
of the phenomenon described above?

Answer 1

Water drops appear inside the wall of the bell jar containing a potted plant while there is no drop in the another bell jar which is without any plant.

Because water drops appear only in the bell jar in which pot is having a plant with its only aerial parts exposed, so it can be concluded that these drops appeared due to the process of transpiration from the aerial parts of the plant. The same can also be concluded by the observations of the control apparatus, in which no water drop appears due to the absence of plant in the pot.

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