Which of the following tissue makes phellogen during the secondary growth in dicot roots?

Options

A. Endodermis
B. Hypodermis
C. Epidermis
D. Periderm

Answer

To answer the question regarding which tissue makes phellogen during the secondary growth in dicot roots, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Phellogen**:
- Phellogen is also known as cork cambium. It is a type of secondary meristematic tissue in plants.

2. **Role of Phellogen**:
- Phellogen is responsible for the formation of the periderm, which is a protective tissue layer that replaces the epidermis during secondary growth.

3. **Components of Periderm**:
- The periderm consists of three parts:
- **Phelloderm**: The innermost layer.
- **Phellogen**: The middle layer (cork cambium).
- **Phellum**: The outermost layer (cork).

4. **Location of Phellogen**:
- Phellogen is derived from the periderm and is crucial for the protective functions of the plant as it covers the shoots and roots.

5. **Identifying the Correct Tissue**:
- Among the options provided (endodermis, hypodermis, epidermis, periderm), we need to identify which of these tissues gives rise to phellogen.
- The epidermis is replaced by the periderm during secondary growth, and the phellogen is part of the periderm.

6. **Conclusion**:
- Therefore, the correct answer to the question is **periderm**, as it is the tissue that contains phellogen (cork cambium) during secondary growth in dicot roots.

### Final Answer:
**Periderm**