The cork cambium, cork and secondary cortex are collectively called

Answer

To answer the question, "The cork cambium, cork, and secondary cortex are collectively called," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Components**:
- The question mentions three components: cork cambium, cork, and secondary cortex.
- Cork cambium is a type of meristematic tissue that produces cork and secondary cortex.

2. **Identifying Each Component**:
- **Cork (Phellum)**: This is the outermost layer of the periderm, which is composed of dead cells that serve as a protective barrier.
- **Cork Cambium (Phellogen)**: This is the layer of living cells that divides to produce cork and secondary cortex.
- **Secondary Cortex (Phelloderm)**: This is the inner layer of the periderm, which consists of living parenchyma cells.

3. **Collective Term**:
- These three components (cork, cork cambium, and secondary cortex) together form a structure that is referred to as the periderm.

4. **Conclusion**:
- Therefore, the cork cambium, cork, and secondary cortex are collectively known as the **periderm**.

### Final Answer:
The cork cambium, cork, and secondary cortex are collectively called **periderm**.

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