The secondary cambium develops partly from pericycle and partly form conjunctive tissue in

Options

A. Monocot root
B. Monocot stem
C. Dicot stem
D. Dicot root

Answer

To solve the question regarding the development of secondary cambium from pericycle and conjunctive tissue, we can break down the explanation step by step.

### Step-by-Step Solution:

1. **Understanding Secondary Cambium**:
- Secondary cambium is a type of lateral meristem that contributes to the secondary growth in plants, particularly in roots and stems.

2. **Identifying the Sources of Secondary Cambium**:
- The question states that secondary cambium develops partly from the pericycle and partly from conjunctive tissue.
- The pericycle is a layer of cells located just inside the endodermis in roots, and it plays a role in the formation of lateral roots and secondary growth.

3. **Differentiating Between Monocot and Dicot Roots**:
- In monocot roots, there is typically no secondary growth, as they lack a cambium layer. Therefore, secondary cambium does not develop from monocot roots.
- In dicot roots, secondary growth is common, and this is where the secondary cambium is formed.

4. **Formation of Secondary Cambium in Dicot Roots**:
- In dicot roots, the secondary cambium arises from:
- **Pericycle**: The cells of the pericycle divide and contribute to the formation of the cambium.
- **Conjunctive Tissue**: This tissue is located between the xylem and phloem in the vascular bundles and also contributes to the formation of cambium.

5. **Conclusion**:
- Since the secondary cambium develops from both pericycle and conjunctive tissue, the correct answer to the question is that this occurs in **dicot roots**.

### Final Answer:
The secondary cambium develops partly from pericycle and partly from conjunctive tissue in **dicot roots**.