Thickened cell walls and obliterated lumen of cells are found in
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Thickened cell walls and obliterated lumen of cells are found in (1) Sclereids (2) Bast fibres (3) Collenchyma (4) Parenchyma
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Xylem fibres
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The lignified walls of xylem fibres are thicker, and the central lumen is obliterated. The middle portion, or lumen, of these tubes, is where chemicals circulate. The presence of nonliving sclerenchyma cells that lose protoplasts at maturity distinguishes xylem fibres.
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