Mechanical properties of sclerenchyma is due to

Options

A. cellulose
B. lignin
C. pectin
D. cutin

Answer

### Step-by-Step Solution

1. **Understanding Sclerenchyma**:
- Sclerenchyma is a type of simple permanent tissue in plants. It consists of thick-walled, dead cells that provide mechanical support to the plant.

2. **Characteristics of Sclerenchyma**:
- Sclerenchyma cells are long, thin, and narrow. They are initially living cells, but upon maturation, they undergo changes that lead to their death.

3. **Role of Lignin**:
- The mechanical properties of sclerenchyma are primarily due to the deposition of lignin in their cell walls. Lignin is a complex organic polymer that adds rigidity and strength to the cell walls.

4. **Comparison with Other Options**:
- **Cellulose**: While cellulose is a component of cell walls, it does not provide the same level of mechanical strength as lignin.
- **Pectin**: Pectin is found in the middle lamella of plant cells and is not responsible for the mechanical properties of sclerenchyma.
- **Cutene**: Cutene is a waxy substance that helps in water retention but does not contribute to the mechanical strength of sclerenchyma.

5. **Conclusion**:
- The correct answer to the question "Mechanical properties of sclerenchyma is due to?" is **lignin**. This substance is crucial for making the plant hard and stiff.