By anticlinal divisions, an organ increases in :

Options

A. circumference
B. volume
C. area
D. length

Explanation

To solve the question "By anticlinal divisions, an organ increases in:", we need to understand the types of cell divisions and their effects on plant organs.

### Step-by-Step Solution:

1. **Understanding Cell Divisions**:
- There are two main types of cell divisions in plants: anticlinal and periclinal divisions.
- Anticlinal divisions are those that occur perpendicular to the surface of the organ, while periclinal divisions occur parallel to the surface.

2. **Effect of Anticlinal Divisions**:
- When anticlinal divisions take place, they result in an increase in the number of cells in a layer without significantly increasing the length of the organ.
- This type of division primarily contributes to the increase in the girth or circumference of the organ.

3. **Comparison with Periclinal Divisions**:
- In contrast, periclinal divisions lead to an increase in the length of the organ as they add new cells parallel to the existing layers.

4. **Conclusion**:
- Since anticlinal divisions increase the number of cells in a layer and thus increase the girth of the organ, the correct answer to the question is that an organ increases in **circumference** due to anticlinal divisions.

### Final Answer:
The correct answer is **circumference**.

---