Cells of vascular cambium divide

Options

A. transversely only
B. periclinally both on outer and inner side
C. perclinally on outer side only
D. anticlinally only

Answer

### Step-by-Step Solution:

1. **Understanding Vascular Cambium**:
- Vascular cambium is a type of lateral meristem found in plants. It is responsible for the secondary growth of stems and roots by producing new vascular tissues.

2. **Division of Vascular Cambium Cells**:
- The cells of the vascular cambium divide to produce two types of tissues: phloem (which transports nutrients) on the outer side and xylem (which transports water) on the inner side.

3. **Types of Cell Division**:
- The division of vascular cambium cells can occur in different planes:
- **Periclinal Division**: This is when the cells divide parallel to the surface of the stem. This type of division increases the number of layers of cells and contributes to the growth of xylem and phloem.
- **Anticlinal Division**: This is when the cells divide perpendicular to the surface of the stem. This type of division increases the circumference of the cambium but does not contribute directly to the formation of new xylem or phloem.

4. **Active Division**:
- The vascular cambium divides more actively on the inner side (producing more xylem) than on the outer side (producing less phloem).

5. **Conclusion**:
- Based on the above understanding, the correct answer to the question is that the cells of vascular cambium divide **periclinally both on the outer and inner side**.

### Final Answer:
- **Option B: Periclinally both on outer and inner side**.

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