AP BIOLOGY

Detailed explanation-1: -The xylem consists of tracheary elements, xylem parenchyma cells, and xylem fiber cells. Tracheary elements are dead, hollow cells with patterned cell walls comprising xylem vessels and tracheids, which function as conductive hollow tubes for water and nutrient transport throughout the plant body.

Detailed explanation-2: -The xylem tracheary elements consist of cells known as tracheids and vessel members, both of which are typically narrow, hollow, and elongated. Tracheids are less specialized than the vessel members and are the only type of water-conducting cells in most gymnosperms and seedless vascular plants.

Detailed explanation-3: -Xylem is one of the conductive tissues found in vascular plants and is essential for transporting water and nutrients from roots to shoots. The water-conducting activity of the xylem relies on pipe-like structures consisting of cells called vessel elements.

Detailed explanation-4: -Tracheids and vessels are the components of the complex xylem tissue. Both help in conduction of water along the stem and provide mechanical support to the plant. Both cells are tubular. Secondary lignification is present in both cells.

Detailed explanation-5: -Tracheids and vessels are associated with xylem of angiosperms. Xylem tracheid occurs in all plants included lower plant, gymnosperms, and angiosperms. Angiosperms have another kind of xylem, that is xylem vessel, which is better in transport water, but tracheids still remain in angiosperms.