Exarch type of arrangement of primary xylem is seen in

Options

A. Root
B. Monocot Stem
C. Leaf
D. Dicot Stem

Answer

To determine the correct answer to the question about the exarch type of arrangement of primary xylem, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Xylem**:
- Xylem is primarily composed of two types: protoxylem and metaxylem.
- Protoxylem is the first formed xylem, while metaxylem is formed later.

2. **Define Exarch Arrangement**:
- In an exarch arrangement, the protoxylem is located towards the periphery (outer side) of the xylem, and the metaxylem is positioned towards the center.
- This arrangement is characteristic of roots.

3. **Analyze the Options**:
- **Root**: In roots, the exarch arrangement is present, with protoxylem on the outside and metaxylem towards the center.
- **Monocot Stem**: Typically has a different arrangement, often endarch, where protoxylem is towards the center.
- **Leaf**: Does not exhibit an exarch arrangement of xylem.
- **Dicot Stem**: Also generally has an endarch arrangement.

4. **Conclusion**:
- Based on the definitions and characteristics of xylem arrangements, the exarch type of arrangement of primary xylem is seen in the **root**.

### Final Answer:
The exarch type of arrangement of primary xylem is seen in **roots**.

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