In a dicot root, with triarch vascular bundles, lateral roots arise from the pericycle the two

Options

A. Opposite to phloem
B. Opposite to protoxylem
C. In between protoxylem and phloem
D. Anwhere

Answer

### Step-by-Step Solution:

1. **Understanding the Structure of a Dicot Root**:
- A dicot root typically has a triarch arrangement of vascular bundles, which means there are three groups of vascular tissues (xylem and phloem).
- The xylem is usually arranged in a star shape with the protoxylem located towards the periphery and the metaxylem towards the center.

2. **Identifying the Vascular Bundles**:
- In a triarch vascular bundle, the arrangement consists of three arms of xylem and corresponding phloem.
- The xylem is exarch, meaning the protoxylem is located outward (toward the periphery) and the metaxylem is inward (toward the center).

3. **Location of the Pericycle**:
- The pericycle is a layer of cells located just inside the endodermis in the root. It is responsible for the formation of lateral roots.

4. **Formation of Lateral Roots**:
- Lateral roots in dicot roots arise from the pericycle.
- Specifically, they emerge opposite to the protoxylem. This means that if you visualize the vascular bundle, the lateral roots will grow outwards from the pericycle, directly across from the protoxylem.

5. **Conclusion**:
- Therefore, in a dicot root with triarch vascular bundles, lateral roots arise from the pericycle opposite to the protoxylem.

### Final Answer:
In a dicot root with triarch vascular bundles, lateral roots arise from the pericycle opposite to the protoxylem.

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