Sclerenchymatous cells in their cell walls have large percentage of :

Options

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

Explanation

**Step-by-Step Solution:**

1. **Understanding Sclerenchyma**: Sclerenchyma is a type of simple permanent tissue in plants. It is primarily composed of dead cells that provide structural support.

2. **Composition of Sclerenchyma**: The cell walls of sclerenchyma cells are characterized by a high percentage of certain substances. The key component that gives sclerenchyma its strength and rigidity is lignin.

3. **Identifying the Correct Answer**: Among the options provided (silica, lignin, pectin, cellulose), lignin is the substance that is found in large quantities in the cell walls of sclerenchyma cells. Therefore, the correct answer is lignin.

4. **Analyzing Other Options**:
- **Silica**: This is primarily found in the epidermal cells of plants, not in sclerenchyma.
- **Pectin**: This is a component found mainly in the cell walls of collenchyma, not sclerenchyma.
- **Cellulose**: While cellulose is a common component of many plant cell walls, it is not the predominant substance in sclerenchyma cells, which are more characterized by lignin.

5. **Conclusion**: The large percentage of lignin in the cell walls of sclerenchyma cells makes them the principal supporting cells in plant tissues that have ceased elongation.

**Final Answer**: Sclerenchymatous cells in their cell walls have a large percentage of **lignin**.

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