In dicot stem, each vascular bundle is

Options

A. Conjoint, open and with exarch xylem.
B. Conjoint, open and with endarch xylem
C. Conjoint, closed and with exarch xylem.
D. Conjoint, closed and with endarch xylem.

Answer

### Step-by-Step Solution:

1. **Understanding Vascular Bundles in Dicot Stem**:
- In dicot stems, vascular bundles are arranged in a specific manner. Each vascular bundle consists of xylem and phloem tissues which are responsible for the transport of water, nutrients, and food.

2. **Identifying the Structure of Vascular Bundles**:
- The vascular bundle in a dicot stem is typically described as "conjoined". This means that both xylem and phloem are located on the same radius of the vascular bundle.

3. **Determining if the Vascular Bundle is Open or Closed**:
- In dicot stems, the presence of a cambium layer between the xylem and phloem indicates that the vascular bundle is "open". The cambium allows for secondary growth, which is characteristic of dicots.

4. **Understanding the Arrangement of Xylem**:
- The arrangement of xylem in the vascular bundle is classified as "endarch". In an endarch arrangement, the protoxylem (the first formed xylem) is located towards the center, while the metaxylem (the later formed xylem) is found towards the periphery.

5. **Conclusion**:
- Therefore, in a dicot stem, each vascular bundle is "conjoined, open, and endarch". This means that the correct description of the vascular bundles in dicot stems is that they are conjoined, open, and have an endarch arrangement of xylem.

### Final Answer:
In dicot stem, each vascular bundle is conjoined, open, and endarch.

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