Central lumen of which one of the following is obliterated?(a) Tracheids(b) Xylem fibres(c) Vessels(d) Xylem parenchyma
The central lumen of (c) vessels is obliterated. Vessels are a type of xylem element in plants, and they are composed of cells called vessel elements. These vessel elements have their central lumen obliterated, meaning that the central portion of these cells is filled with perforations or openings that allow for efficient water transport through the xylem tissue. This adaptation helps in the efficient transportation of water and minerals in plants.
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