HORTICULTURE

Detailed explanation-1: -1. Xylem parenchyma is the only living component that is present in the xylem tissue. All the other tissues are dead when they are mature.

Detailed explanation-2: -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. Phloem forms a small part of the plant body.

Detailed explanation-3: -Mature xylem is made up of dead cells that do not have cell contents, while phloem contains living cells (albeit without nuclei). The structure of xylem and phloem is also different. While xylem is made up of tracheids and vessels, phloem is made up of sieve tubes which have many holes for transporting nutrients.

Detailed explanation-4: -Tracheids, vessels and xylem fibres are dead when mature. Thus, option C is correct.