Collenchyma tissue is characterized by

Options

A. Elongated cells with thickening at the corners
B. Isodiametric cells with thickening all over the walls
C. Isodiametric cells with deposits of cellulose and liginin at the corners
D. Elongated cells which are not involved in the function of food storage

Answer

**Step-by-Step Solution:**

1. **Understanding Collenchyma Tissue:**
- Collenchyma is a type of plant tissue that provides support and flexibility to the plant. It is primarily found in the stems, leaves, and petioles.

2. **Characteristics of Collenchyma Cells:**
- The cells of collenchyma tissue are elongated, which is a key characteristic that distinguishes them from other types of plant cells.

3. **Cell Wall Composition:**
- Collenchyma cells have thickened cell walls, particularly at the corners where the cells meet. This thickening is primarily due to the presence of pectin and hemicellulose.

4. **Living Cells:**
- Collenchyma cells are living cells, which means they can perform various functions such as storage of nutrients and photosynthesis.

5. **Functionality:**
- The main functions of collenchyma include providing mechanical support, allowing for flexibility, and storing food. They also help in the growth of young stems and leaves.

6. **Analyzing the Options:**
- Option 1 states "elongated cells with thickening at the corners," which accurately describes collenchyma.
- Option 2 mentions "isodiametric cells with thickening all over the walls," which is incorrect as collenchyma cells are elongated.
- Option 3 refers to "isodiametric cells with deposit of cellulose and lignin at the corners," which is also incorrect.
- Option 4 states "elongated cells which are not involved in the function of food storage," which is misleading as collenchyma does store food.

7. **Conclusion:**
- Based on the analysis, the correct characterization of collenchyma tissue is that it consists of elongated cells with thickening at the corners.

**Final Answer:** Collenchyma tissue is characterized by elongated cells with thickening at the corners.

---