Collenchyma provides extra structural support, particularly in regions of new growth . "'Sclerenchyma "'cells have thick lignified secondary walls and often die when mature.
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Sclerenchyma fibres are of great economic importance, since they constitute the source material for many fabrics ( e . g . flax, hemp, jute, and ramie ).
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Unlike the collenchyma, mature sclerenchyma is composed of dead cells with extremely thick cell walls ( secondary walls ) that make up to 90 % of the whole cell volume.
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They are small bundles of sclerenchyma tissue in plants that form durable layers, such as the cores of apples and the gritty texture of pears ( " Pyrus communis " ).
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*Sclerenchyma cells Sclerenchyma cells ( from the Greek "'skleros "', " hard " ) are hard and tough cells with a function in mechanical support.
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*Sclerenchyma cells Sclerenchyma cells ( from the Greek "'skleros "', " hard " ) are hard and tough cells with a function in mechanical support.
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Shanu 06 : 43, 20 June 2008 ( UTC ) Most of the plant tissue ( like sclerenchyma tissue ) are made up of'cells'which contain no protoplasm and are completely dead.
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If they are not cells how can sclerenchyma be called a tissue ( given that tissue is a group of'cells'performing same function with common origin ( correct me if I am wrong ) )?
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This species is closely related to " L . longifolia "; the inner bract and flowers are similar, but it differs in leaf apex, lack of conspicuous marginal sclerenchyma bands on leaves, and in inflorescence branching.
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The distribution of young and mature aphids on the leaf surfaces is dictated by their stylet length-the short stylets of young aphids cannot penetrate the lignin of the sclerenchyma of large veins and are thus restricted to feeding on smaller veins.
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