Xylem in roots is ........... .

Answer

### Step-by-Step Solution:

1. **Understanding Xylem Structure**: Xylem is a type of vascular tissue in plants responsible for the transport of water and nutrients. It consists of different types of cells, including tracheids and vessel elements.

2. **Identifying the Type of Xylem in Roots**: In roots, the xylem is classified based on its arrangement and developmental pattern. The specific type of xylem found in roots is known as "exarch."

3. **Defining Exarch Xylem**: Exarch xylem is characterized by the arrangement of its components. In exarch xylem, the protoxylem (the first-formed xylem) is located towards the periphery (outer part) of the root, while the metaxylem (the later-formed xylem) is situated towards the center.

4. **Conclusion**: Therefore, the xylem in roots is classified as "exarch," with protoxylem located at the outer edge and metaxylem towards the center.

### Final Answer:
Xylem in roots is exarch, with protoxylem located towards the periphery and metaxylem towards the center.

---