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

To solve the question regarding the characteristics of collenchyma tissue, we will analyze each option provided in the question step by step.

### Step 1: Analyze the first option
**Option A: Elongated cells with thickening at the corners.**
- Collenchyma tissue is indeed characterized by elongated cells. These cells have thickened corners due to the deposition of cellulose, hemicellulose, and pectin. This thickening provides structural support to the plant, especially in young and growing parts.
- **Conclusion:** This statement is correct.

### Step 2: Analyze the second option
**Option B: Isodimetric cells with thickening all over the walls.**
- Isodimetric cells are roughly spherical and are characteristic of parenchyma tissue, not collenchyma. Collenchyma cells are elongated, not isodimetric, and the thickening is not all over the walls but primarily at the corners.
- **Conclusion:** This statement is incorrect.

### Step 3: Analyze the third option
**Option C: Isodimetric cells with deposit of cellulose and lignin at the corners.**
- Again, isodimetric cells refer to parenchyma tissue. Collenchyma does not have isodimetric cells; instead, it has elongated cells. Additionally, while collenchyma cells have cellulose, they do not typically have lignin deposits at the corners.
- **Conclusion:** This statement is incorrect.

### Step 4: Analyze the fourth option
**Option D: Elongated cells which are not involved in the function of food storage.**
- While collenchyma cells are elongated, they can sometimes contain chloroplasts and may perform photosynthesis, which means they can be involved in food storage. Therefore, this statement is misleading as it implies that collenchyma cells are entirely non-functional in food storage.
- **Conclusion:** This statement is incorrect.

### Final Conclusion
Based on the analysis of all options, the most appropriate answer is:
**A: Elongated cells with thickening at the corners.**