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, we need to analyze the characteristics of the given tissue types and determine which one fits the description provided in the question.

### Step-by-Step Solution:

1. **Understanding the Question**: The question states that the cells of a certain tissue are living, show angular wall thickenings, and provide mechanical support.

2. **Analyzing the Options**:
- **Option 1: Xylem**:
- Xylem is primarily responsible for the conduction of water and minerals in plants.
- The cells in xylem (like tracheids and vessels) are dead at maturity.
- Therefore, this option is incorrect because the question specifies that the tissue must have living cells.

- **Option 2: Sclerenchyma**:
- Sclerenchyma cells are known for their thick, lignified walls and are primarily involved in providing structural support.
- However, sclerenchyma cells are dead at maturity.
- Thus, this option is also incorrect as it does not meet the requirement of having living cells.

- **Option 3: Parenchyma**:
- Parenchyma cells are living cells that can perform various functions including storage, photosynthesis, and tissue repair.
- They often have thin walls but can also show angular wall thickenings in certain types (like collenchyma).
- They provide mechanical support as well, especially in young and growing parts of the plant.
- Therefore, this option fits all the criteria mentioned in the question.

- **Option 4: Epidermis**:
- The epidermis is the outer layer of cells covering the plant.
- While the epidermal cells are living, they do not typically show angular wall thickenings.
- Hence, this option is not correct for the given question.

3. **Conclusion**: After analyzing all the options, the correct answer is **Option 3: Parenchyma**.

### Final Answer:
The correct answer is **Parenchyma**.