Vascular cambium forms xylem on the inside and phloem on the outside due to -

Options

A. Differential action of hormones
B. Intrafascicular nature
C. Shearing force of wind
D. Effect of growth

Answer

### Step-by-Step Solution:

1. **Understanding Vascular Cambium**:
- Vascular cambium is a type of lateral meristem in plants that is responsible for secondary growth. It is located between the xylem (wood) and phloem (bark) tissues.

2. **Formation of Xylem and Phloem**:
- The vascular cambium produces xylem towards the inside and phloem towards the outside. This arrangement is characteristic of conjoined collateral vascular bundles, which are open type bundles.

3. **Reason for the Arrangement**:
- The reason for this specific arrangement (xylem inside and phloem outside) is primarily due to the **differential action of hormones**. Hormones such as auxins and cytokinins play a crucial role in regulating the growth and differentiation of these tissues.

4. **Elimination of Other Options**:
- Other potential reasons, such as intrafascular nature or external factors like wind or growth effects, do not explain the specific arrangement of xylem and phloem. The formation is not influenced by these factors in the context of vascular cambium function.

5. **Conclusion**:
- Therefore, the correct answer to the question is that the vascular cambium forms xylem on the inside and phloem on the outside due to the differential action of hormones.