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Xylem fibres – Highly thickened walls and obliterated central lumens

Vessel – Tube like structure made up of many cells called vessel members, each with lignified walls and a large central cavity. These are devoid of protoplasm 

Tracheids – Elongated tube like cells with thick and lignified wall. These are dead and without protoplast

Xylem parenchyma – Living and thin walled cellulosic cells. They store food materials in the form of resin, latex and mucilage.