where is exarch condition ?

Options

A. Stem
B. Root
C. Leaf
D. Both (1) & (2)

Answer

### Step-by-Step Solution:

1. **Understanding Exarch Condition**:
- The exarch condition refers to a specific arrangement of xylem in plants where there are multiple strands of primary xylem. This condition is characterized by the development of xylem from the outside towards the center, which is known as centripetal development.

2. **Identifying Xylem Types**:
- In the exarch condition, the protoxylem (the first-formed xylem) is located closest to the periphery (outer part), while the metaxylem (the later-formed xylem) is situated closer to the center.

3. **Location of Exarch Condition**:
- The exarch condition is primarily found in the roots of vascular plants, particularly in monocotyledonous (monocot) roots.

4. **Analyzing the Options**:
- Given the options:
1. Stem
2. Root
3. Leaf
4. Both one and two
- The most accurate answer is that the exarch condition is found in the roots, especially in monocot roots. It can also be present in stems, but it is predominantly associated with roots.

5. **Conclusion**:
- Therefore, the correct answer to the question "Where is exarch condition found?" is **Root**.