Which one provides hardness to cell wall?

Options

A. Cellulose
B. Suberin
C. Lignin
D. Cutin

Answer

**Step-by-Step Solution:**

1. **Identify the Components of the Cell Wall**: The cell wall of plants is primarily composed of various substances, including cellulose, lignin, suberine, and cutin.

2. **Understand the Role of Each Component**:
- **Cellulose**: A polysaccharide that provides some rigidity and structural support to the cell wall but is not the primary contributor to hardness.
- **Lignin**: A complex organic compound that is a phenolic polymer. It is crucial for providing hardness and rigidity to the cell wall, especially in woody plants.
- **Suberine**: A waxy substance that serves as a waterproofing agent and is a major component of cork, but does not contribute to hardness.
- **Cutin**: A component of the plant cuticle that helps prevent water loss but is not involved in providing hardness to the cell wall.

3. **Determine the Hardness Provider**: Among the options, lignin is specifically known for providing hardness and structural support to the plant cell wall, particularly in areas like wood and bark.

4. **Conclude the Answer**: Therefore, the component that provides hardness to the cell wall is **lignin**.

**Final Answer**: Lignin provides hardness to the cell wall.

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