What is the role of secondary meristems in the body of some plants?

Options

A. Secondary growth
B. Primary growth
C. Intercalary tissues
D. Apical growth

Answer

### Step-by-Step Solution:

1. **Understanding Secondary Meristems**:
- Secondary meristems are types of meristematic tissues that develop in the mature regions of roots and shoots of some plants. They are responsible for the growth that occurs after the primary growth has taken place.

2. **Location of Secondary Meristems**:
- These meristems are found in the mature parts of the plant, specifically in the regions that have already undergone primary growth. They are typically located in the vascular and cork cambium.

3. **Function of Secondary Meristems**:
- The primary role of secondary meristems is to facilitate secondary growth. This growth is characterized by an increase in the thickness or girth of the plant, which is crucial for the structural support of the plant as it matures.

4. **Importance of Secondary Growth**:
- Secondary growth is essential for the plant to develop a stronger and more robust structure. This is particularly important for woody plants, as they need to support their weight and resist environmental factors.

5. **Distinction from Primary Meristems**:
- It is important to differentiate secondary meristems from primary meristems. Primary meristems are responsible for primary growth, which increases the length of the plant. In contrast, secondary meristems contribute to the increase in thickness.

6. **Types of Secondary Meristems**:
- The two main types of secondary meristems are the vascular cambium and the cork cambium. The vascular cambium produces secondary xylem (wood) and secondary phloem, while the cork cambium produces the outer protective layer (cork).

### Summary:
Secondary meristems play a crucial role in the secondary growth of plants, allowing them to increase in thickness and develop a stronger structure necessary for supporting the plant as it matures.