Protostele is

Options

A. Stele divided into many parts
B. Early stele with central solid xylem surrounded by phloem
C. Latent stele
D. Angiosperm stele.

Answer

### Step-by-Step Solution:

1. **Definition of Protostele**:
- Protostele is the most primitive form of stele found in vascular plants. It is characterized by having a solid core of xylem at its center.

2. **Structure of Protostele**:
- In protostele, the solid core of xylem is surrounded by phloem. This means that the xylem is located in the middle, and the phloem encases it on the outside.

3. **Types of Protostele**:
- Protostele can be further divided into several types, including:
- **Haplosteel**: A simple form with a single core of xylem.
- **Actinosteel**: Characterized by a star-shaped xylem arrangement.
- **Plectosteel**: Where plate-like regions of xylem are surrounded by phloem.

4. **Evaluating Options**:
- The question provides four options regarding the definition of protostele:
- Option 1: "Stele divided into many parts" - Incorrect.
- Option 2: "Early stele with central solid xylem surrounded by phloem" - Correct.
- Option 3: "Latent stele" - Incorrect.
- Option 4: "Angiosperm stele" - Incorrect.

5. **Conclusion**:
- The correct answer to the question "Protostele is" is option 2: "Early stele with central solid xylem surrounded by phloem".