Origin of lateral roots is

Options

A. Endogenous
B. Axillary
C. Exogenous
D. Peripheral

Answer

**Step-by-Step Solution:**

1. **Understanding Lateral Roots**: Lateral roots are roots that grow from the primary root or taproot. They are essential for the stability and nutrient absorption of the plant.

2. **Identifying the Origin**: The question asks about the origin of lateral roots. This means we need to determine where these roots develop from within the plant structure.

3. **Defining Terms**:
- **Endogenous**: This term means that something originates from within. In the context of roots, it implies that lateral roots grow from internal tissues.
- **Exogenous**: This means that something originates from outside. In terms of roots, it would suggest that lateral roots grow from external tissues.
- **Axillary**: This term typically refers to branches or shoots that arise from the axil of a leaf, not directly related to root development.
- **Peripheral**: Similar to exogenous, this term indicates something that comes from the outer layer or surface.

4. **Analyzing the Vascular System**: The vascular system of the root includes the pericycle, which is a layer of cells located just inside the endodermis. It plays a crucial role in the formation of lateral roots.

5. **Conclusion**: Since lateral roots originate from the pericycle, which is an internal layer of the root, we can conclude that they are formed from within the root structure. Therefore, the correct answer is **endogenous**.

**Final Answer**: The origin of lateral roots is **endogenous**.

---