Which of the following tissues has dead cells?

Options

A. Phloem parenchyma
B. Companion cells
C. Bast fibres
D. Sieve tubes

Answer

To determine which of the following tissues has dead cells, let's analyze each option provided:

1. **Phloem Parenchyma**:
- Phloem parenchyma consists of thin-walled living cells.
- Functions: It is primarily involved in storage and lateral food conduction.
- **Conclusion**: Phloem parenchyma has living cells.

2. **Companion Cells**:
- Companion cells are also living cells.
- They are connected to sieve tube members of phloem through plasmodesmata.
- **Conclusion**: Companion cells are living cells.

3. **Bast Fibers**:
- Bast fibers, also known as phloem fibers, are an important component of phloem tissue.
- They are made up of sclerenchymatous cells, which are characterized by thick cell walls.
- At maturity, these cells lose their protoplasm and become dead.
- **Conclusion**: Bast fibers are dead cells at maturity.

4. **Sieve Tubes**:
- Sieve tubes are living cells that lack a nucleus at maturity.
- They are involved in the transport of nutrients in the phloem.
- **Conclusion**: Sieve tubes are living cells.

After analyzing all the options, we can conclude that the tissue with dead cells is **Bast Fibers**.

### Summary:
The tissue that has dead cells is **Bast Fibers**.