Stele includes

Options

A. Pericycle
B. Vascular bundles
C. Pith
D. all of these

Explanation

**Step-by-Step Solution:**

1. **Definition of Stele**: The stele is the central core of the stem and root in vascular plants. It consists of vascular tissues and associated supporting tissues.

2. **Components of Stele**:
- **Pericycle**: This is the outermost layer of the stele, located just next to the endodermis. It is composed of a single layer of thin-walled parenchyma cells.
- **Vascular Bundles**: These are the next layer within the stele and consist of xylem and phloem. Xylem is responsible for water transport, while phloem is responsible for nutrient transport.
- **Conjunctive Tissue**: This layer is made up of parenchyma cells found between the vascular bundles. These cells are specialized for the storage of water.
- **Pith**: The innermost layer of the stele, composed of soft, spongy parenchyma cells. The pith serves to store and transport nutrients throughout the plant.

3. **Summary of Stele Composition**: Thus, the stele includes the pericycle, vascular bundles (xylem and phloem), conjunctive tissues, and pith.

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