The main parts of root water absorption are A, root crown, B meristem, C elongation zone, D mature z

The root crown is the main uptake organ of plants, which absorbs organic nutrients and minerals in addition to inorganic salts and water.

The mature zone of the root tip has a large number of root hairs and a large number of ducts A large number of root hairs can greatly increase the surface area of root water absorption and improve the efficiency of root water absorption, that is, increase the water absorption per unit time.

Option d should be that the mature zone has many root hairs, and the root hairs mainly absorb water and inorganic salts.

Mature Zone. There are root hairs that increase the contact area with the soil.

The main part of the root that absorbs water is the mature zone.

The mature zone, also called the root hair zone, is in the upper part of the elongation zone, the cells pause and elongate, and the opening differentiates, and a part of the epidermis protrudes outward to form root hairs. The main part of the root that absorbs water and inorganic salts. In the mature zone and its upper part, a local cell inside the root differentiates to form a duct, which can transport water and inorganic salts.

So the main part of the root tip that absorbs water is the mature zone.

The physiological activity of the plant root system causes the pressure at which the sap flows up from the roots, known as root pressure. Root pressure presses the water from the roots to the aboveground part, and the water in the soil is continuously replenished to the roots, which forms the root water absorption process, which is the active water absorption caused by the root formation force.

The principle of root water absorption:

The leaves of higher plants can also absorb water when they are moistened by rain or dew, but the number is very small and has no significance in terms of water**. The root system is the main organ of terrestrial plants to absorb water, and it absorbs a lot of water from the soil to meet the needs of the plant body. The absorption of water by the roots is mainly carried out at the root tip.

In the root tip, the water absorption capacity of the root hair zone is the largest, and the root crown, meristem and elongation zone are smaller.

The poor water absorption of the last three parts is related to factors such as thick cytoplasm, underdeveloped conductive tissue, and high resistance to water movement. There are many root hairs in the root hair area, which increases the absorption area; At the same time, the outer part of the root hair cell wall is composed of pectin, which is viscous and hydrophilic, which is conducive to adhesion and water absorption with soil particles.

Moreover, the conductive tissue of the root hair area is well developed, and the resistance to water movement is small, so the water absorption capacity of the root hair area is the largest. Since the root water absorption is mainly carried out in the root apical part, the transplantation of seedlings should be avoided as much as possible to avoid damaging the fine roots.

The mature area has a large number of root hairs, which increases the contact area between plants and soil, and the mature area is the main part of the plant that absorbs water and inorganic salts.

The root tip refers to the section from the top of the root to the root hair, and its structure is the root crown, meristem area, elongation area, and mature area from the top, and the mature area is also called the root hair area; In the upper part of the elongation zone, the cells stop elongating and begin to differentiate, and a part of the epidermal cells protrudes outward to form root hairs It is the main part of absorbing water and inorganic salts The presence of root hairs increases the absorption area of the roots The root hairs can secrete a variety of substances, such as organic acids, etc., so that the salts that are difficult to dissolve in the soil are dissolved and become nutrients that are easily absorbed by plants In the mature area and its upper part, a part of the cells inside the root differentiate to form ducts, which can transport water and inorganic salts

Therefore, d