The tissues involves in secondary growth are :

Options

A. Lateral meristem
B. Vascular cambium
C. Cork cambium
D. All of them

Answer

To answer the question regarding the tissues involved in secondary growth, let's break down the information step by step.

### Step-by-Step Solution:

1. **Understanding Secondary Growth**:
- Secondary growth refers to the increase in the girth (thickness) of a plant, rather than its height. This process is primarily seen in dicots and some gymnosperms.

2. **Identifying the Tissues Involved**:
- The tissues responsible for secondary growth are primarily lateral meristems. There are two main types of lateral meristems involved:
- **Vascular Cambium**: This tissue is responsible for the formation of secondary xylem (wood) and secondary phloem (bark).
- **Cork Cambium (Phellogen)**: This tissue produces cork cells, which replace the epidermis in older stems and roots.

3. **Role of Lateral Meristems**:
- Both vascular cambium and cork cambium are types of lateral meristem that contribute to the secondary growth process. They continuously produce new cells, leading to an increase in the diameter of the plant.

4. **Conclusion**:
- Since both vascular cambium and cork cambium are involved in secondary growth, along with other tissues that may be present in the plant (like cortex and stelae), the correct answer to the question is **all of them**.

### Final Answer:
The tissues involved in secondary growth are: **all of them** (vascular cambium, cork cambium, and other related tissues).

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