Thickening material present in wall of collenchyma is

Options

A. Pectin, cellulose, hemicellulose
B. Lignin, cellulose, hemicellulose
C. Hemicellulose, subernin, cellulose
D. Suberin, pectin, cellulose

Answer

### Step-by-Step Solution:

1. **Understanding Collenchyma**: Collenchyma is a type of living permanent tissue in plants that provides mechanical support. It is characterized by its elongated cells.

2. **Cell Wall Composition**: The cell walls of collenchyma are not uniform; they are irregularly thickened. This thickening is crucial for the mechanical support that collenchyma provides to the plant.

3. **Identifying Thickening Materials**: The thickening materials present in the walls of collenchyma include:
- **Cellulose**: A polysaccharide that forms the primary structure of plant cell walls.
- **Pectin**: A complex carbohydrate that helps in cell adhesion and provides flexibility.
- **Hemicellulose**: A group of polysaccharides that contribute to the structural integrity of the cell wall.

4. **Evaluating the Options**: The question provides several options for the thickening material present in the walls of collenchyma:
- **Option 1**: Pectin, Cellulose, Hemicellulose (This is correct)
- **Option 2**: Lignin, Cellulose, Hemicellulose (Incorrect, as lignin is found in dead tissues like sclerenchyma)
- **Option 3**: Hemicellulose, Suberin, Cellulose (Incorrect, as suberin is found in cork cells)
- **Option 4**: Suberin, Pectin, Cellulose (Incorrect, as suberin is not present in collenchyma)

5. **Conclusion**: The correct answer is **Pectin, Cellulose, and Hemicellulose**, as these are the materials responsible for the thickening of the cell walls in collenchyma.