function of sclerenchyma
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Answers:Sclerenchyma Mature sclerenchyma cells are dead and have secondary cell walls thickened with cellulose and usually impregnated with lignin. In contrast to collenchyma, which is pliable, sclerenchyma is elastic. The cell cavity or lumen is very small or it may disappear completely. There are two types of sclerenchyma cells, namely sclereids and fibres. Sclereids: The cells are irregular in shape. The cell walls are thick, hard and lignified which makes the lumen very small. Simple pits (canals) are found in the thickened cell walls and link adjacent cells. Sclereids are commonly found in fruit and seeds. Fibres: The cells are needle-shaped with pointed tips, thick walls and rather small lumen. Secondary cell walls, impregnated with, are formed. Simple pits are also present. Fibres are abundant in the vascular tissue of angiosperms, i.e. flowering plants. Functions: sclerenchyma is an important supporting tissue in plants, sclereids are responsible for the hardness of date seeds and the shell of walnut, fibres probably play a role in the transport of water in the plant, starch granules are stored in the young, living fibres. Photos in second link.
Answers:Sclerenchyma cells function in support of the plant. They contain a thick secondary wall containing lignin. For all intent and purpose these cells function best when dead.
Answers:Sclerenchyma cells function in structural support of the stem and protection of the vascular bundles. Sclerenchyma cells are small and posses tough, thick cell walls. These walls are often impregnated with lignin, a highly branched polymer that makes cell walls more rigid. Mature sclerenchyma cells can not elongate and are found in regions of the plant that have stopped growing in length. At maturity sclerenchyma cells may actually be dead.
Answers:Sclerenchyma cells are single cells or groups of connected cells whose principal function is thought to be mechanical support of plants or plant parts. They are found in the stem, the roots (thick rigid cellular layers), and in the vascular bundles of the leaves. Sclerenchyma cells have thick secondary walls and may or may not remain alive when mature. They vary greatly in form and are of widespread occurrence in vascular plants. Two general types, sclereids and fibers, are widely recognized, but since these transform from one form to another through a series of stages or forms that involve partial transitions, the distinction is sometimes arbitrary.