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Q.

Which among the following have sunken stomata?

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a

Hydrilla

b

Mangifera

c

Zea mays

d

Nerium

answer is D.

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Detailed Solution

Concept: Stomata are the pores on leaves that allow the release of water vapours and gaseous exchange. Sunken stomata will reduce the rate of transpiration.
Transpiration is the process by which plants lose water through water vapour through stomata on leaves. It not only helps conduct water and minerals to the different parts of the plant but also cools the surface of the leaves. It is generally found in desert plants to reduce the rate of transpiration. In the given examples, Nerium is a xerophyte and thus has shrunken stomata to check upon the rate of transpiration.
Hence, the correct answer is option 4.

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