In secondary vascular tissue, the radial system in composed of

Options

A. tracheary elemetns
B. fibres
C. vascular rays
D. all of these

Answer

To answer the question about what the radial system in secondary vascular tissue is composed of, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Secondary Vascular Tissue**:
- Secondary vascular tissue is formed from the vascular cambium and includes both xylem and phloem.

2. **Identifying Components of Secondary Vascular Tissue**:
- The main components of secondary vascular tissue are tracheary elements (found in xylem), fibers (sclerenchyma), and vascular rays.

3. **Evaluating Each Option**:
- **Option A: Tracheary Elements**:
- Tracheary elements are indeed part of the xylem and thus part of secondary vascular tissue, but they do not form the radial system.
- **Option B: Fibrocytosis**:
- Fibrocytosis refers to sclerenchyma fibers that are present in both xylem and phloem. However, like tracheary elements, they are not part of the radial system.
- **Option C: Vascular Rays**:
- Vascular rays are the structures that extend radially between the xylem and phloem. They are crucial for the radial system in secondary vascular tissue.

4. **Conclusion**:
- The radial system in secondary vascular tissue is composed of vascular rays. Therefore, the correct answer is **Option C: Vascular Rays**.