Question

(a) How does transpiration help in the functioning of plants?
(b) During an experiment, a plant leaf was coated with Vaseline. What would happen to the leaf and why?
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Answer 1

a) transpiration creates a suction pull in the roots of the plants which enables it to create an ion gradient change and diffuse soil nutrients into it for further processes.

b) coating of vaseline locks the pores and blocks any loss of water by transpiration and makes the leaf remain hydrated.

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Answer 2

PART I

Advantages of transpiration are as follows :

1) It creates suction force for the ascent of sap.

2)It affects the diffusion pressure deficit, thereby indirectly helping diffusion through the cells.

3)It helps in the evaporation of excess H2O.

4)It plays an indispensable role in the translocation of food from one part of the plant to another.

PART II

If the leaf of a plant is covered with vaseline, them it's stomatal pores will get blocked. Therefore, the plant will not be able to respire or breath. Moreover, transpiration will also not take place and as a result, plant will not remain healthy for a long period of time. ...

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