Differences between sclerenchyma fibres and sclereids
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The main difference between fibres and sclereids is that fibres are unbranched, elongated cells whereas sclereids are short, isodiametric or irregular cells that may be branched or unbranched. Moreover, fibres have tapering end walls while the end walls of the sclereids are blunt.
Fibres and sclereids are two types of sclerenchyma cells that differ in shape. Fibres originate from meristematic cells while sclereids are formed by the secondary wall thickening of parenchyma cells.
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Fibres: Thick, elongated, spindle-shaped cells with pointed tips
Sclereids: Sclerenchyma cells with highly-thickened lignified cell walls having a narrow lumen
Shape
Fibres: Elongated cells
Sclereids: Broad cells with irregular shape
End Walls
Fibres: Tapering end walls
Sclereids: Blunt end walls
Branching
Fibres: Unbranched
Sclereids: Branched or unbranched
Origin
Fibres: From meristematic cells
Sclereids: By the secondary wall thickening of parenchyma cells
Organization
Fibres: Generally occur in bundles
Sclereids: Singly or loose groups
Occurrence
Fibres: Cortex, pericycle, xylem, and phloem
Sclereids: Cortex, pith, pulp of fruits, and fruit walls
Function
Fibres: Provides mechanical strength
Sclereids: Provides stiffness
Conclusion
Fibres are elongated cells while sclereids are broad cells. Both fibres and sclereids are sclerenchyma cells with a thick, secondary cell wall that is lignified. The main difference between fibres and sclereids is the shape of the cells.
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