AP BIOLOGY

Detailed explanation-1: -Xylem is the dead tissue at maturity, but no cell contents. Phloem is the living tissue, but not with the nucleus. Xylem often constitutes the bulk of the plant body.

Detailed explanation-2: -Xylem sclerenchyma are the non-living cells whose protoplasm get lost at the time of maturity.

Detailed explanation-3: -Additionally, the xylem provides mechanical strength. It is composed of tracheids, xylem fibers, vessels, and xylem parenchyma. Tracheids and vessels are the main water-conducting components of the xylem. They are dead cells as they do contain any protoplasm.