The cell wall diagram illustrates its complex structure and diverse functions. Cell walls provide structural support, and protection, and regulate cell processes. The cell wall diagram class 9 and 11 is an important diagram that is often asked in the examinations. The cell wall is made up of primarily cellulose, polysaccharides, and proteins.
The labelled cell wall diagram in plant is given below:
Diagram of cell Wall
Table of Content
What is Cell Wall?
The diagram of cell wall shows it as a structural layer surrounding the cell membrane of many cells, providing shape, support, and protection. Cell wall is primarily found in plant cells, but it’s also present in bacteria, fungi, algae, and some archaea. Cell wall is made up of cellulose in plants, chitin in fungi, and peptidoglycan in bacteria. Cell wall maintains cell shape, prevents excessive water uptake, and offers protection against pathogens and mechanical stress. Moreover, it’s involved in cell-cell communication and facilitates nutrient transport.
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Composition of Cell Wall
The composition of cell wall depends on the organisms of demand of the environment:
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Plants
- Cellulose: Provides structural support and rigidity.
- Hemicellulose: Contributes to strength and flexibility.
- Pectin: Helps hold cells together and regulates permeability.
- Lignin (in woody plants): Adds strength and waterproofing.
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Bacteria
- Peptidoglycan: Forms a mesh-like structure for support and protection.
- Lipopolysaccharides (in Gram-negative bacteria): Help anchor the cell wall and serve as antigens.
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Fungi
- Chitin: Provides strength and rigidity.
- Glucans and Mannans: Contribute to the structural framework.
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Algae
- Cellulose: Similar to plant cell walls.
- Sulfated polysaccharides (e.g., agar, carrageenan): Provide additional support and protection.
Cell Wall Functions
Some of the cell wall functions are given below:
- Structural Support: Provides structural support and shape to the cell, helping it maintain its integrity and also helps in resisting mechanical stress.
- Protection: It acts as a barrier against physical damage, pathogens, and other external threats.
- Regulation of Cell Volume: Helps regulate the internal pressure and volume of the cell, preventing excessive swelling or bursting.
- Water Regulation: Helps in regulating water uptake and loss, maintaining optimal hydration levels for cellular processes.
- Support for Growth and Development: Provides a surface for cell expansion during growth and development, guiding the direction of cell expansion.
- Stress Response: Helps in the plant’s response to various environmental stresses such as drought, salinity, and extreme temperatures.
- Secondary Metabolite Production: Participates in the synthesis and deposition of secondary metabolites such as lignin in plant cell walls, which contributes to rigidity and defense.
- Selective Permeability: Controls the movement of molecules in and out of the cell, allowing essential nutrients to enter while keeping harmful substances out.
Conclusion – Diagram of Cell Wall
The diagram of cell wall in plants shows its structure in detail. The cell wall serves as a important component in plant cell. As it provides structural integrity, protection, and regulation of cell functions. Cell wall helps the plant from the outer diverse environmental conditions. They maintain the optimum conditions for the cell to perform its function normally.
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FAQs on Diagram of Cell Wall
What is Cell wall in Biology class 8?
A cell wall is the hard layer which covers or surrounds the cell membrane of the plant cell.
What are the Functions of Cell Wall?
Cell wall provide protection from the outer environment. It also helps the cell in maintaining its shape.
What is Cell Wall made up of?
Cell wall is composed of cellulose, hemicellulose and pectin.
Do Animals have a Cell Wall?
No animal don’t have cell wall. They just have the outer plasma membrane.
What is Cell Wall and its Diagram?
The cell wall is a rigid outer layer surrounding plant cells, providing structural support and protection. You can find the labelled diagram of cell wall at the top of the article.
What is Cell Wall Class 9?
The cell wall is a rigid outer layer found in plant cells, fungi, bacteria, and some protists, providing structural support and protection to the cell.