Extra - stelar tissue among following is

Options

A. Secondary cortex
B. Secondary xylem
C. Interxylary phloem
D. Duramen

Answer

To solve the question "Extra-stelar tissue among the following is," we need to identify which of the provided options represents extra-stelar tissue.

### Step-by-Step Solution:

1. **Understanding Stelae**:
- Stelae refers to the central region of the stem and root, which includes vascular bundles, pericycle, pith, and medullary rays.

2. **Defining Extra-stelar Tissue**:
- Extra-stelar tissue is defined as the tissue system that is located outside the stelae. This includes tissues such as the endodermis, primary cortex, secondary cortex, and epidermis.

3. **Analyzing the Options**:
- The options given are:
1. Secondary Cortex
2. Secondary Xylem
3. Interxylary Phloem
4. Duramen

4. **Identifying Extra-stelar Tissues**:
- **Secondary Cortex**: This is located outside the stelae and is considered an extra-stelar tissue.
- **Secondary Xylem**: This is part of the stelae, not extra-stelar.
- **Interxylary Phloem**: This is also part of the vascular system within the stelae.
- **Duramen**: This refers to the heartwood of a tree, which is also part of the stelae.

5. **Conclusion**:
- The only option that qualifies as extra-stelar tissue is **Secondary Cortex**.

### Final Answer:
- The extra-stelar tissue among the following is **Secondary Cortex**.