What is true for collenchyma?

Options

A. It has well developed power to dediferentiate
B. It is absent in aerial parts
C. Uneven pecto-cellulose thickening at corner
D. All of the above

Answer

To answer the question "What is true for collenchyma?", we will analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding Collenchyma**:
- Collenchyma is a type of permanent tissue found in plants. It provides support and flexibility, especially in young stems and petioles.

2. **Evaluating the Options**:
- **Option 1**: "It has well-developed power to differentiate."
- Collenchyma does show some ability for de-differentiation, but it is not well-developed in this capacity compared to parenchyma. Therefore, this statement is **incorrect**.

- **Option 2**: "It is absent in aerial parts."
- This is also incorrect because collenchyma is present in the aerial parts of plants, such as young stems and leaf petioles. Hence, this statement is **incorrect**.

- **Option 3**: "The uneven pectocellulosic thickening at the corners."
- This statement is true. Collenchyma has uneven thickening of pectocellulose at the corners of its cells, which provides structural support. Therefore, this statement is **correct**.

- **Option 4**: "All of the above."
- Since options 1 and 2 are incorrect, this option is also **incorrect**.

3. **Conclusion**:
- The only true statement regarding collenchyma is the third option: "The uneven pectocellulosic thickening at the corners."

### Final Answer:
The correct answer is: **The uneven pectocellulosic thickening at the corners.**

---