This phenomenon is called transpiration.
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The waxy part of leaves is called the cuticle, which is a thin, waterproof layer on the outer surface of the leaf. It helps reduce water loss through evaporation and protects the leaf from damage.
Evaporation is the process by which water from the Earth's surface, such as bodies of water or soil, is converted into water vapor and released into the atmosphere. Transpiration, on the other hand, is the process by which plants release water vapor through their leaves. Both evaporation and transpiration contribute to the water cycle by adding moisture to the atmosphere.
The waxy layer that surrounds the leaf and helps prevent excessive water loss is called the cuticle. It acts as a barrier that reduces evaporation and protects the leaf from environmental stressors.
The outer surface of the leaf with a waxy coating is called the cuticle. The cuticle helps reduce water loss from the leaf and provides protection against pathogens and physical damage.
The cuticle on the upper surface of a leaf helps to reduce water loss through evaporation and protect the leaf from damage. Since the underside of the leaf is not exposed directly to sunlight and does not play a major role in gas exchange, it does not have a thick cuticle layer.