Question

Sclerenchyma


The image
shows the transverse structure of sclerenchyma tissue.
Which characteristic of sclerenchyma cells provides strength to the plant
parts?

(a) Presence of cells with regular shape
(b) Presence of thin walls and dead cells
(c) Presence of large spaces between the cell
(d) Presence of thick walls with deposition of lignin
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Answer 1

Answer:

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Sclerenchyma, in plants, support tissue composed of any of various kinds of hard woody cells. Mature sclerenchyma cells are usually dead cells that have heavily thickened secondary walls containing lignin. The cells are rigid and nonstretchable and are usually found in nongrowing regions of plant bodies, such as the bark or mature stems. Sclerenchyma is one of the three types of ground, or fundamental, tissue in plants; the other two types are parenchyma (living thin-walled tissue) and collenchyma (living support tissue with irregular walls). Sclerenchyma cells occur in many different shapes and sizes, but two main types occur: fibres and sclereids.

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Answer 2

The following characteristic of sclerenchyma cells provides strength to the plant parts: (d) Presence of thick walls with deposition of lignin.

• The transverse section of sclerenchyma tissue shown in the image displays the thick walls of these cells with lignin deposition.
• Lignin deposition makes the walls of these cells thick. The lignified walls are thickened so much that often there is no internal space left inside the cell.
• This thick lignified wall helps in providing strength to the plant parts.
• Sclerenchyma cells are usually dead, but they have thick walls and not thin walls.
• Sclerenchyma cells do not have large spaces between cells.