NEET BIOLOGY

Detailed explanation-1: -Xylem transports water and nutrients that enter the plant in the root up through the stem and out to all parts of the leaf. Xylem has two types of cells known as tracheids and vessel elements.

Detailed explanation-2: -Upward movement of water through xylem is best explained by cohesion theory. It states that cohesion pull is responsible for movement of water in the xylem. The force of cohesion tension exceeds root pressure on a sunny day because on a sunny day the rate of transpiration is high.

Detailed explanation-3: -Main function – upwards water transport. The xylem, vessels and tracheids of the roots, stems and leaves are interconnected to form a continuous system of water-conducting channels reaching all parts of the plants. The system transports water and soluble mineral nutrients from the roots throughout the plant.

Detailed explanation-4: -The vascular system is comprised of two main types of tissue: the xylem and the phloem. The xylem distributes water and dissolved minerals upward through the plant, from the roots to the leaves. The phloem carries food downward from the leaves to the roots.

Detailed explanation-5: -Xylem tissues start as living cells, but as the cells mature, they undergo ordered deconstruction to help form the hollow tubes that make up the xylem vessels. The main function of the xylem vessels is to transport water in one upward direction from the roots, through the stem, and to the leaves.