Cells of ……... tissue are living, show angular wall thickenings and provide mechanical support.

Options

A. xylem
B. sclerenchyma
C. Collenchymas
D. Epidermis

Answer

To solve the question "Cells of ……... tissue are living, show angular wall thickenings and provide mechanical support," we need to analyze the options provided and determine which tissue fits the description.

### Step 1: Identify the characteristics of the tissue
- The tissue must be **living**.
- It should exhibit **angular wall thickenings**.
- It must provide **mechanical support**.

### Step 2: Analyze the options
1. **Xylem**:
- Xylem is a complex tissue responsible for the transport of water and minerals.
- It consists of dead cells (like tracheids and vessel elements) and does not fit the criteria of being living.
- **Conclusion**: Not the correct answer.

2. **Sclerenchyma**:
- Sclerenchyma is a type of simple permanent tissue.
- It has thick walls but is composed of dead cells.
- While it provides mechanical support, it does not meet the living criteria.
- **Conclusion**: Not the correct answer.

3. **Collenchyma**:
- Collenchyma is also a simple permanent tissue.
- It consists of living cells that have thickened cell walls, particularly at the corners, due to the deposition of cellulose, hemicellulose, and pectin.
- It provides mechanical support to the growing parts of the plant, such as young stems and petioles.
- **Conclusion**: This option fits all the criteria.

4. **Epidermis**:
- The epidermis is a protective layer covering various plant parts.
- While it consists of living cells, it does not have angular wall thickenings and primarily serves as a barrier rather than providing mechanical support.
- **Conclusion**: Not the correct answer.

### Step 3: Final Answer
Based on the analysis, the correct answer is **Collenchyma**.