Which of the following tissues consist of living cells

Options

A. Vessels
B. Tracheids
C. Companion cells
D. Sclerenchyma

Answer

To determine which of the following tissues consist of living cells, let's analyze each option step by step:

1. **Vessels**:
- Vessels are part of the xylem tissue, which is responsible for the transport of water and minerals from the roots to the rest of the plant.
- However, vessels are composed of dead cells at maturity. They provide mechanical support and facilitate water transport but do not consist of living cells.

2. **Trachea**:
- Similar to vessels, trachea are also part of the xylem tissue.
- They are responsible for conducting water and are made up of dead cells when mature. Thus, trachea do not consist of living cells.

3. **Companion Cells**:
- Companion cells are specialized parenchymatous cells found in the phloem tissue.
- They play a crucial role in maintaining the pressure gradient in sieve tubes, which are responsible for transporting sugars and nutrients.
- Companion cells are indeed living cells, making this option a correct answer.

4. **Sclerenchyma**:
- Sclerenchyma is a type of supportive tissue in plants that provides strength and rigidity.
- It is composed of dead cells at maturity, which means it does not consist of living cells.

**Conclusion**: The only tissue among the options that consists of living cells is **Companion Cells**.

### Final Answer:
The correct option is **Companion Cells**.