AP BIOLOGY

Detailed explanation-1: -Tracheids, vessels, xylem fibers, and xylem parenchyma are the four types of elements that make up the xylem. Tracheids: Tracheids are long, tube-like cells with lignified walls and a tapering end. These are non-protoplasmic and dead.

Detailed explanation-2: -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.

Detailed explanation-3: -Xylem consists of tracheids, vessels, parenchyma, and fibers.

Detailed explanation-4: -tracheid, in botany, primitive element of xylem (fluid-conducting tissues), consisting of a single elongated cell with pointed ends and a secondary, cellulosic wall thickened with lignin (a chemical binding substance) containing numerous pits but having no perforations in the primary cell wall.

Detailed explanation-5: -1: Tracheids and vessel elements: Tracheids (top) and vessel elements (bottom) are the water conducting cells of xylem tissue. Phloem tissue is responsible for translocation, which is the transport of soluble organic substances, for example, sugar.