It is called the cuticle
A cuticle is the waxy material that helps plants retain water.
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Waxy layer on outer surface of green plants is called cuticle .This cuticle is actually present in outer cell walls of epidermal cells . The wax present in cuticle is a type of lipid . It is waterproof layer which prevents excessive loss of water by transpiration . It also protects plant from abrasive damage. Wax is chemically a mixture of esters of long chain fatty acids eg cerotic acid , montanic acid , long chain alkanes , alcohols , ketones .
This layer is called the epidermis. It is made of a waxy cuticle that prevents water loss and toxins from entering the plant.
The cuticle
Leaves have a waxy coating called a cuticle to prevent excess water loss through transpiration. Without this coating they would dry up. The waxy layer blocks the stomata preventing as much water evaporating from them
The purpose of the waxy outer layer of a leaf, which is called a cuticle, is to keep the leaf from losing water inside the leaf. Plants that live in the water do not have this problem, so they have no cuticle.
The waxy later that keeps plants from drying out is called the waxy cuticle. Essentially this also acts to keep the plants waterproof. It keeps the plants from getting too much water, and also keeps the water from escaping too fast.
The waxy waterproof layer that cover most plant leaves and stems is called a cuticle. The cuticle is thicker on the upper half of a leaf's surface, and it is waterproof so as the internal areas of the leaf are kept secure from flooding, That's why you water plants at the roots.
Leaves have a waxy layer on top of their epidermis layer called the cuticle. This waxy surface protects the leaves from sunburn, dessication (drying out) and reduces attacks by fungi, bacteria, virus particles and insects.
Absorption of water from soil and its conservation
The waxy layer, or cuticle, on a leaf is designed to minimize water loss by evaporation.