AP BIOLOGY

Detailed explanation-1: -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-2: -The tracheid is the basic cell in the xylem, that is, all plants have tracheids, but not the more highly evolved vessel elements.

Detailed explanation-3: -A. Xylem tracheids and sieve tubes in phloem.

Detailed explanation-4: -Tracheids are nonliving cells found in the xylem of the more ancient plant types, seedless vascular plants (ferns, club mosses, and horsetails) and gymnosperms (cedar, pine, and cypress trees).

Detailed explanation-5: -What are Tracheids? Tracheids are present in the xylem of angiosperms. They are conducting elements. They are also found in gymnosperms and ferns.