Question

what is cell wall what is cell wall​

Answer 1

The cell wall is the outer layer of a cell membrane. The cell wall is the backbone to give protection and structure to cells.

• Plants cells have cell walls.
• Can't find cell walls in an animal cell.
• Cell walls are only present in plants cell.
• Plants cells got a perfect structure with the help of the cell wall.
• Tough, flexible, and rigid are the cell walls pattern.
• The Cell wall is made up of cellulose.
• Carbo hydrates long fibres are the main component of cell walls.

Answer 2

Answer:

The cell wall is the thick, rigid, non-living,semi-elastic, transparent, specialized form of the protective extracellular matrix of the plant cells.

Explanation:

• The cell wall is the thick, fairly rigid, non-living,semi-elastic, transparent, specialized form of the protective extracellular matrix of the plant cells.

• This is present outside the plasmalemma of cells found in plant cells, fungal cells, some protists, and prokaryotes. It is absent in animal cells and thus is a unique character of plant cells.

• It was first observed by Robert Hooke in 1665. Its thickness varies from 0.1 μm to 10 μm.

• This cellulosic, outer coat of plant cells is composed of two parts: a gel-like 'matrix' and fine fibrils called 'microfibrils'.

• These complex cell walls are composed of 3 layers: the primary wall,middle lamella or the intercellular substances, and the secondary wall.

The formation of the Cell wall can be summarized as:

Origin of cell plates(Phragmoplast)

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Beginning of transformation of cell plate into middle lamella

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Beginning of deposition of cell wall Primary cell wall

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Secondary cell wall (Outer→middle layer→inner layer)

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Completion of wall thickening

Function:

1. The cell wall provides mechanical support and strength to plants, particularly in higher plants with vascular systems.

2. Provides protection and rigidity to plant cell

3. Accounts for water retention capacity

Thus cell wall is a specialized form of the extracellular matrix that is closely associated with the external surface of the plant cell membrane.