Amature sieve tube

Options

A. Possesses a peripheral cytoplasm and no nucleus
B. Has a large vacuole
C. is connected with companion cells by pit fields present between their common longitudinal wall
D. All

Answer

### Step-by-Step Solution for the Question: Amature Sieve Tube

1. **Understanding the Structure of Mature Sieve Tubes**:
- Mature sieve tubes are specialized cells in the phloem of flowering plants responsible for the transport of nutrients, particularly sugars.
- They have a unique structure that includes a peripheral cytoplasm and a large central vacuole.

2. **Peripheral Cytoplasm and Absence of Nucleus**:
- In mature sieve tubes, the cytoplasm is located at the periphery of the cell, while the nucleus is absent.
- The absence of the nucleus is significant as it allows for more space for the transport of substances.

3. **Presence of Large Central Vacuole**:
- The central vacuole in mature sieve tubes is large and occupies a significant portion of the cell.
- This vacuole is crucial for maintaining turgor pressure and storing substances.

4. **Connection to Companion Cells**:
- Mature sieve tubes are connected to companion cells through structures known as pit fields.
- These connections allow for the transfer of nutrients and regulatory signals between the sieve tubes and companion cells.

5. **Conclusion**:
- All the statements regarding the structure and function of mature sieve tubes are correct.
- Therefore, the answer to the question is that all the options provided are true.