Vascular cambium of dicot root is purely secondary in origin and airse from

Options

A. Cells of conjuctive parenchyma just below phloem
B. Cells of pericycle just outside protoxylem
C. Cells of parenchyma between xylem and pholem
D. More than one option is correct

Answer

**Step-by-Step Solution:**

1. **Understanding Vascular Cambium:**
- Vascular cambium is a type of secondary meristem found in dicot plants. It is responsible for the secondary growth, which increases the diameter of stems and roots.

2. **Origin of Vascular Cambium:**
- In dicot roots, the vascular cambium arises from specific tissues after the primary growth has ceased. It is important to identify the correct source of this cambium.

3. **Options Analysis:**
- The question provides four options regarding the origin of the vascular cambium:
1. Cells of conjunctive parenchyma just below phloem.
2. Cells of parenchyma between xylem and phloem.
3. Cells of pericycle just outside proto xylem.
4. More than one option is correct.

4. **Identifying the Correct Origins:**
- The vascular cambium can arise from:
- **Cells of conjunctive parenchyma**: This is located just below the phloem.
- **Cells of parenchyma between xylem and phloem**: This is also a source of vascular cambium.
- **Cells of pericycle**: This is located just outside the proto xylem and is another source of vascular cambium.

5. **Conclusion:**
- Since all three types of cells mentioned in the options contribute to the formation of vascular cambium, the correct answer is that more than one option is correct.

**Final Answer:**
The vascular cambium of dicot root is purely secondary in origin and arises from more than one option being correct.

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