The main reason for stomata to occur on the underside of leaves is because this is the part of the plant that is shielded from the sun and more protected from the elements. As the underside receives less light, water does not evaporate as quickly, which allows for transpiration to occur.
Stomata is usually found only on the upper epidermis in plants with floating leaves. These are known as epistomatous or hyperstomatous. Moreover, plants with submerged leaved may lack stomata entirely.
Answer:
The guy in comments is right it the green thing thats with dark green dots.
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