hairy areas is a region of the root of plants where the root hairs responsible for the absorption of water and mineral salts that will be part of the raw sap. They are generally located above the distension zone, where the root has the highest growth rate.
In plants, all roots have a hairy zone, characterized by having many fine hairs, which have as function to absorb the water the plant needs for its vital activities without which the plant cannot to live. This process of absorbing water from the soil is one of the raw materials for the photosynthesis process of plants.
The root area corresponds to 130 times the area of the aerial part of the plant and is an adaptation against the great loss of water in the form of steam - vegetative transpiration. - which occurs in the aerial part. When a plant is pulled out of the ground, it loses a lot of these absorbent hairs and small roots. As a result, her absorption capacity, especially water, becomes reduced and she may die dehydrated. When replanting, some of the leaves must be removed to reduce the surface water loss in the form of steam while the plant remakes its hairy zoma.
The human body also has hairy areas, which are regions of the body covered with hair, such as the head, eyebrows, beard, etc.