Which one is not the part of stele?

Options

A. Pericycle
B. Pith
C. Vascular bundle
D. Cortex

Answer

To determine which part is not a part of the stele, we need to understand the components that make up the stele in plant anatomy. The stele is primarily composed of vascular tissues and associated structures.

### Step-by-Step Solution:

1. **Understanding the Stele**: The stele is the central part of the root or stem, which includes the vascular tissues (xylem and phloem), pericycle, and sometimes pith. It is responsible for the transport of water, nutrients, and food.

2. **Identifying the Options**:
- **Option 1: Pericycle** - This is a layer of cells that is part of the stele, located just inside the endodermis in roots. It plays a role in the formation of lateral roots.
- **Option 2: Pit** - This is not a recognized part of the stele. Pits are small depressions in the cell wall that allow for the passage of fluids between adjacent cells but are not part of the stele structure.
- **Option 3: Vascular Bundle** - This is a part of the stele, consisting of xylem and phloem tissues that transport water and nutrients.
- **Option 4: Cortex** - This is the outer layer of the stem or root, located outside the stele. It is not considered part of the stele.

3. **Conclusion**: Based on the definitions and roles of each component, the part that is not included in the stele is the **Cortex** (Option 4).

### Final Answer:
The part that is not a part of the stele is **Cortex (Option 4)**.

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