Question

What is the meaning of xylem fibers have 'obliterated central lumen'?

Answer 1

Definition of xylem fiber. : any of various fibers located in or associated with xylem and typically having an angular cross-section and heavily lignified walls with prominent bordered pits — compare phloem fiber.

Answer 2

Xylem is a vascular tissue transporting water to other parts of the plants. The transport in xylemis uni-directional and it occupies the center of the vascular bundles. It is made up of tracheids, vessels, xylem parenchyma.

The fibers of xylem have thick walls and obliterated central lumen. Lumen is the space that is present in the center of the cell and due to the presence of thickened walls, it is indistinguishable.