included or intraxylary cork develops from

Options

A. vascular cambium
B. wood parenchyma
C. medullary rays
D. parenchymatous pericycle.

Answer

To answer the question "Included or intraxylary cork develops from," we will follow these steps:

### Step-by-Step Solution:

1. **Understand the Terminology**:
- The term "included cork" or "intraxylary cork" refers to a type of cork tissue that develops within the xylem.

2. **Identify the Source of Cork**:
- Cork, in general, is produced by a tissue known as phellem, which is derived from the cork cambium (phellogen). However, in the case of intraxylary cork, we need to focus on its specific origin.

3. **Examine the Options**:
- The options provided are:
- Vascular cambium
- Wood parenchyma (secondary xylem)
- Medullary rays
- Parenchymatous pericycle

4. **Analyze Each Option**:
- **Vascular Cambium**: This is a meristematic tissue that produces secondary xylem and phloem but does not directly produce cork.
- **Wood Parenchyma (Secondary Xylem)**: This is the correct option. The intraxylary cork develops from the parenchyma cells of the secondary xylem.
- **Medullary Rays**: These are tissues that connect the xylem and phloem but do not form cork.
- **Parenchymatous Pericycle**: This tissue is involved in secondary growth but does not produce intraxylary cork.

5. **Conclusion**:
- Based on the analysis, the intraxylary cork develops from the wood parenchyma, which is part of the secondary xylem.

### Final Answer:
The intraxylary cork develops from **wood parenchyma (secondary xylem)**.

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