Which of the following conditions of xylem is present in both monocot and dicot stems?

Options

A. endarch
B. polyarch
C. mesarch
D. exarch

Explanation

To determine which condition of xylem is present in both monocot and dicot stems, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Vascular Bundles**:
- In both monocots and dicots, the vascular bundles are arranged in a specific manner. They are typically conjoined, meaning they consist of both xylem and phloem.

2. **Identify the Arrangement of Xylem and Phloem**:
- In the conjoined vascular bundles, the phloem is located on the outer side, while the xylem is situated on the inner side. Between these two tissues, there is a layer of cambium.

3. **Differentiate Between Primary and Secondary Xylem**:
- The cambium layer divides the xylem into two types: primary xylem and secondary xylem.
- The primary xylem is referred to as protoxylem, and the secondary xylem is known as metaxylem.

4. **Recognize the Arrangement of Protoxylem and Metaxylem**:
- In the xylem arrangement, the protoxylem is located on the inner side, while the metaxylem is on the outer side. This specific arrangement is crucial for identifying the condition of xylem.

5. **Define the Endarch Condition**:
- The arrangement where the protoxylem is located towards the center (inner side) and the metaxylem is towards the outside (outer side) is termed the "endarch condition." This condition is also referred to as the centrifugal condition.

6. **Conclude the Answer**:
- Since the endarch condition is present in both monocot and dicot stems, we can conclude that the correct answer to the question is "endarch."

### Final Answer:
The condition of xylem that is present in both monocot and dicot stems is the **endarch condition**.

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