Which of the following arrangements of xylem is found in the stem of plants ?

Options

A. Endarch
B. Exarch
C. Mesarch
D. Polyarch

Answer

To determine the arrangement of xylem found in the stem of plants, we need to analyze the options provided and understand the characteristics of each arrangement.

### Step-by-Step Solution:

1. **Understanding Xylem Arrangement**: Xylem can be arranged in different ways in various plant structures. The common arrangements include endarch, exarch, mesarch, and polyarch.

2. **Identifying the Correct Arrangement**:
- **Endarch**: In this arrangement, the protoxylem is located towards the center (inner side) of the xylem, while the metaxylem is on the outer side. This arrangement is typically found in the stems of dicotyledonous plants.
- **Exarch**: Here, the protoxylem is located towards the outer side, and the metaxylem is towards the center. This arrangement is usually found in roots.
- **Mesarch**: This arrangement is not commonly found in stems but is seen in some ferns and is characterized by both protoxylem and metaxylem being present in the same vascular bundle.
- **Polyarch**: This arrangement is characterized by multiple protoxylem strands and is typically found in monocot roots.

3. **Conclusion**: Based on the definitions and characteristics of each arrangement, the correct answer for the arrangement of xylem found in the stem of plants is **Endarch**. Therefore, the correct option is the first one.

### Final Answer:
The arrangement of xylem found in the stem of plants is **Endarch**.

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