(A)_____ consists of cells which are much thick end at the corners due to the deposition of cellulose, hemicellulose and (B)_____.

Answer

To solve the question, we need to identify the tissue type described and the substances involved in the thickening of the cell walls.

### Step-by-Step Solution:

1. **Identify the Tissue**: The question states that the tissue consists of cells that are thickened at the corners. This description matches a specific type of plant tissue known for its thickened cell walls.

- **Hint**: Think about plant tissues that provide support and have irregularly thickened corners.

2. **Name the Tissue**: The tissue with thickened corners is called **collenchyma**. This type of simple tissue is characterized by its living cells that provide support to the plant, especially in young stems and petioles.

- **Hint**: Recall the types of simple tissues in plants and their functions.

3. **Identify the Components**: The question mentions that the thickening is due to the deposition of cellulose, hemicellulose, and another substance.

- **Hint**: Consider what other substances are commonly found in plant cell walls that contribute to their structure.

4. **Determine the Missing Component**: The third component that is deposited along with cellulose and hemicellulose in collenchyma is **pectin**. Pectin is a polysaccharide that helps in cell wall stability and structure.

- **Hint**: Think about the role of pectin in plant cell walls and how it contributes to their rigidity.

5. **Final Answer**: Based on the above analysis, we conclude that:
- (A) **Collenchyma**
- (B) **Pectin**

### Summary:
(A) Collenchyma consists of cells which are much thickened at the corners due to the deposition of cellulose, hemicellulose, and (B) pectin.