Simplest type of stele is

Options

A. with Pith, siphonostele
B. without pith, protostele
C. without pith, siphonostele
D. with Pith, protostele

Answer

To determine the simplest type of stele, we need to understand the definitions and characteristics of different types of stele.

### Step-by-Step Solution:

1. **Understanding Stele**:
- Stele refers to the central cylinder of vascular tissue in plants, which includes xylem, phloem, and sometimes the pericycle and medullary rays with pith.

**Hint**: Remember that stele is a structural component of vascular plants.

2. **Types of Stele**:
- There are two main types of stele: protostele and siphonostele.
- **Protostele**: This type has a solid core of xylem and does not contain pith.
- **Siphonostele**: This type has an open core that may be filled with pith.

**Hint**: Focus on the presence or absence of pith when distinguishing between the two types of stele.

3. **Identifying the Simplest Type**:
- The term "simplest" indicates that we are looking for the most primitive form of stele.
- Protostele is considered the simplest type because it has a solid xylem core and lacks pith.

**Hint**: The prefix "proto-" suggests primitiveness or simplicity.

4. **Evaluating Options**:
- If we look at the options:
- Option 1 (with pith) refers to siphonostele, which is not the simplest.
- Option 2 (without pith) refers to protostele, which is correct.
- Option 3 (siphonostele) is incorrect as it has pith.
- Option 4 (proto-steel) is also incorrect as it does not have pith.

**Hint**: Eliminate options that include pith to find the simplest type.

5. **Conclusion**:
- Therefore, the simplest type of stele is **protostele**.

### Final Answer:
The simplest type of stele is **protostele**.