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Comparitive Study Of The Rates Of Transpiration In The Upper And Lower Surface Of Leaves

Compare the rates of transpiration in the upper and the lower surface of leaves. Read more:   Transpiration

What is Transpiration? It is the process of water movement through a plant which evaporates through the aerial parts of the plant into the atmosphere. It occurs through specialized openings known as stomata that are present on leaves which are chiefly concerned with a gas exchange during the process of respiration and  Photosy n thesis . The stomata are girdled with specialized cells that govern the closing and the opening of the stomata known as guard cells. They assist in the regulation of the rate of transpiration. Explore more: Photosynthesis

Through the experiment carried out, it is observed that the amount of time taken for the colour change of the cobalt chloride paper from blue to pink on the lower surface of the leaf is lesser than the upper leaf surface.

The rapid switch of the colour of the cobalt chloride paper on the lower surfaces depicts that rate of loss of water vapour is higher on the lower surface than the upper surface.

Q.1. List the importance of the process of transpiration. Any two points. A.1.  Following is the significance of the process of transpiration:

Explore more:  Transpiration pull. Q.2. What are some environmental factors affecting the rate of transpiration? A.2.  Transpiration can be affected by the following:

Q.3. Why is water loss greater in the lower surface of the plant in comparison with the upper surface? A.3.  It is because usually the distribution and number of stomata vary in the lower and upper surface of leaves. The lower surface of leaves has a greater number of stomata to carry out the process of transpiration. Q.4. Why is this experiment a comparative study? A.4.  It is a comparative study as the rate of transpiration of both the leaf surfaces i.e., the upper and the lower surface is compared. Q.5. Why is cobalt chloride paper used in this experiment? A.5.  It is because this paper turns into a pink colour when it reacts with water. Hence this property of the paper can be used to demonstrate the process of transpiration. Q.6. How is the rate of transpiration estimated in this experiment? A.6.  It can be estimated by taking into account the time the paper takes to switch its colour from blue to pink.   Related Links:

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