briefly describe the structure of cell wall?
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The cell wall is a well known structure as it is, the most rigid protective supportive and semitransparent covering of the plant cells (since, it is absent in animal cells), fungi and some protists.
The cell wall was first seen in the living plant cell called cork cells by Robert Hooke in 1665. It's thickness varies in different types of cells from 0.1 micrometer to 10 micrometer.
Cell wall is a nonliving extracellular secretion or matrix of the cell which is closely appressed to it. However, metabolically active and is capable of growth.
The structure of the cell wall can be upto three parts- middle lamella, primary wall and secondary wall.
1) Middle lamellar is a thin, amorphous and the cementing layer between the two adjacent cells, it is the first layer which is deposited at the time of cytokinesis.
2) Primary wall is the first formed wall of the cell wall which is produced inner to the main middle lamella. It is commonl thin from 1 to 3 micrometers and capable of extension.
3) Secondary wall is produced in some very mature cells when the latter have stopped growing or dismembered their growth. Some of the, are, tracheostomy, vessel elements, fibres, collenchyma. It is a inner laid to the primary wall by accretion or deposition of materials over the surface of the previous or existing structure.
The cell wall was first seen in the living plant cell called cork cells by Robert Hooke in 1665. It's thickness varies in different types of cells from 0.1 micrometer to 10 micrometer.
Cell wall is a nonliving extracellular secretion or matrix of the cell which is closely appressed to it. However, metabolically active and is capable of growth.
The structure of the cell wall can be upto three parts- middle lamella, primary wall and secondary wall.
1) Middle lamellar is a thin, amorphous and the cementing layer between the two adjacent cells, it is the first layer which is deposited at the time of cytokinesis.
2) Primary wall is the first formed wall of the cell wall which is produced inner to the main middle lamella. It is commonl thin from 1 to 3 micrometers and capable of extension.
3) Secondary wall is produced in some very mature cells when the latter have stopped growing or dismembered their growth. Some of the, are, tracheostomy, vessel elements, fibres, collenchyma. It is a inner laid to the primary wall by accretion or deposition of materials over the surface of the previous or existing structure.
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