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Get Answers to all your Questions
- #Class 11
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- #Cell Structure and Function
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Which of the following are the structural components of cell wall?
Matrix, Fibres, Deposition
Matrix, Microfibrils and Depositions
Mesohyl, Matrix, and Depositions
None of these
Answers (1)
The Cell Wall -
Structure of the cell wall
A typical cell wall is made up of:
a) Matrix: It is a gel-like ground substance consisting of 30 - 60% water, Hemicellulose, 2 - 8% pectin, 0.5 - 3 % lipids, 1 - 2 % proteins.
b) Microfibrils: It is approximately 20-40%. It is a structural element of the cell wall, also called as the steel bars of the cell wall. In plants, microfibrils are composed of cellulose. In fungi, it is composed of fungal cellulose, which is equivalent to chitin.
c) Depositions on the cell wall:
1. Lignin:
- associated with sclerenchyma cells, tracheids, and vessels.
- it is a non-polysaccharide compound
- provides hardness, and stiffness to the cell wall
2. Suberin:
- it is a hydrophobic substance
- prevents water loss from the organ
- examples: cork cells, endodermis (casparian strips)
3. Cutin:
- it is a waxy substance
- hydrophobic in nature
- present on epidermal cells
- reduce water loss from the leaves
4. Silica:
- It is associated with grasses, Equisetum (pteridophytes)
- provides protection, hardness/stiffness
- protects the grass from grazing animals
5. Calcium, Iron deposition
Example: Chara
A cell wall shows the following structural details: Matrix, Microfibrils and Depositions
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