Which one is absent in wood ?

Options

A. Cellulose
B. Lignin
C. Pectin
D. Fat

Answer

To determine which component is absent in wood among cellulose, lignin, pectin, and fat, we can analyze the roles and presence of each of these biomolecules in wood.

### Step-by-Step Solution:

1. **Identify the Components**: The components we need to analyze are cellulose, lignin, pectin, and fat.

2. **Understand Cellulose**:
- Cellulose is a carbohydrate that is abundant in wood.
- It provides structural stiffness to the plant, making it essential for the integrity of the wood.

3. **Understand Lignin**:
- Lignin is a complex organic polymer that provides structural support to the plant tissues.
- It helps the plant stand upright and is a significant component of wood, contributing to its rigidity.

4. **Understand Pectin**:
- Pectin is a group of polysaccharides found in the cell walls of plants.
- It plays a role in cell growth, differentiation, and maintaining tissue integrity.
- Pectin is also present in wood.

5. **Understand Fat**:
- Fat, which is a type of lipid, is not a structural component of wood.
- Unlike cellulose, lignin, and pectin, fat does not contribute to the rigidity or structural support of wood.

6. **Conclusion**: Based on the analysis, fat is the component that is absent in wood, while cellulose, lignin, and pectin are present.

### Final Answer:
**Fat is absent in wood.**