In angular collenchyma, thickenings are present ______

Options

A. on the tangential walls
B. on the walls bordering intercellular spaces
C. at the corners of cell
D. throughout the cell wall

Explanation

### Step-by-Step Solution:

1. **Understanding Angular Collenchyma**: Angular collenchyma is a type of plant tissue that provides support and flexibility to the plant. It is characterized by its elongated cells.

2. **Cell Structure**: The cells of collenchyma have thickened cell walls. These thickened walls are crucial for providing structural support to the plant, especially in areas that experience bending or stretching.

3. **Location of Thickening**: In angular collenchyma, the thickening of the cell walls is not uniform throughout the cell. Instead, the thickening is specifically located at the corners of the cells.

4. **Function of Thickening**: The thickened corners help the plant withstand mechanical stress, such as wind, by allowing the plant to bend without breaking. This flexibility is essential for the survival of the plant in its natural environment.

5. **Conclusion**: Therefore, the correct answer to the question is that in angular collenchyma, thickenings are present at the corners of the cell.

### Final Answer:
In angular collenchyma, thickenings are present **at the corners of the cell**.

---