AP BIOLOGY

Detailed explanation-1: -There are two major types of xylem fibers: (1) fiber tracheids and (2) libriform fibers. Fiber tracheids are rather involved in providing mechanical support than in conduction.

Detailed explanation-2: -Xylem is composed of 4 elements: tracheids, vessels, xylem parenchyma and xylem fibres.

Detailed explanation-3: -Xylem consists of tracheids, vessels, parenchyma, and fibers. Vessels consist of vessel elements joined together in files by large perforation plates, large gaps in the end walls between successive vessel elements, while tracheids have tapering ends that overlap with adjacent cells, and lack perforation plates.

Detailed explanation-4: -Xylem fibers are the thick lignified fibers that are made up of the dead sclerenchyma cells. These are located between the xylem vessels and the tracheid of the xylem in a plant. They are hard tissues and are woody in nature.