Secondary growth brought about by vascular cambium in dicots is a type of

Options

A. Senescence
B. Geometric growth
C. Arithmetic growth
D. Plasticity

Answer

To solve the question regarding the type of secondary growth brought about by vascular cambium in dicots, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Secondary Growth**:
- Secondary growth refers to the increase in thickness or girth of the plant, which occurs after the primary growth (lengthening) has taken place. This growth is primarily due to the activity of the vascular cambium.

2. **Role of Vascular Cambium**:
- The vascular cambium is a type of lateral meristem that produces secondary xylem (wood) and secondary phloem (bark). This process contributes to the overall increase in the diameter of the plant stem.

3. **Types of Growth**:
- We need to differentiate between the types of growth mentioned in the options:
- **A. Sinuses**: Refers to older and less active tissues, not applicable here.
- **B. Geometric Growth**: Characterized by a growth pattern where the rate of growth increases exponentially over time. This is not typical for secondary growth.
- **C. Isometric Growth**: Refers to growth where the proportions of the organism remain constant. This does not apply to secondary growth either.
- **D. Plasticity**: Involves changes in growth patterns due to environmental factors, which is not relevant to the specific growth mechanism of vascular cambium.

4. **Identifying the Correct Type**:
- The correct type of growth associated with the activity of vascular cambium is **Arithmetic Growth**. In this type of growth, the increase in size is more linear, as the cambium divides to produce new cells, which then differentiate into xylem and phloem. This results in a consistent increase in thickness rather than an exponential increase.

5. **Conclusion**:
- Therefore, the answer to the question is **Option C: Arithmetic Growth**.