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Arpita took a strip of blotting paper of 3cm * 5cm and clipped one half on the upper surface and the other half on the lower surface of a leaf. What would she most likely observe after one hour?
(a) Blotting paper clipped on the upper surface is more wet.
(b) The observation cannot be predicted.
(c) Blotting paper is equally wet on both the surfaces of the leaf.
(d) Blotting paper clipped on the lower surface is more wet.
Correct Answer: (d) Blotting paper clipped on the lower surface is more wet.
Explanation:
Stomata are the tiny openings, present in the epidermis of leaves, stems, and other organs, to allow the exchange of gases.
The stomatal pore is guarded by two kidney bean-shaped cells known as guard cells. It helps in the closing and opening of the stomatal pore.
A lower surface of the leaf contains more stomata compared to an upper surface of the leaf.
Functions:
(i) Stomata allow the exchange of gases. Commonly carbon dioxide is consumed and oxygen is released through stomata during photosynthesis, while oxygen is consumed and carbon dioxide is released through stomata during respiration.
(ii) Through the stomatal pore, the excess amount of water is released from aerial parts of the plant in the form of water vapor through transpiration.
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