Periderm is formed from -

Options

A. Vascular cambium
B. Phellogen
C. Fascicular cambium
D. Interfascicular cambium

Answer

### Step-by-Step Solution:

1. **Understanding Periderm**:
- Periderm is a secondary protective tissue that replaces the epidermis during the secondary growth of stems and roots.

2. **Components of Periderm**:
- The periderm is a multilayered tissue system, primarily consisting of cork (also known as phallum).

3. **Characteristics of Cork (Phallum)**:
- The cork cells are dead at maturity and have their primary walls covered from the inside by a secondary wall, which consists of suberin lamellae and wax layers.

4. **Origin of Periderm**:
- The lateral meristem responsible for producing periderm is called the fallogen.

5. **Function of Fallogen**:
- The fallogen is a single layer of cells that encircles the stem and produces periderm centrifugally (outward).

6. **Differentiating Between Options**:
- Vascular cambium and fascicular cambium are synonymous and do not form periderm.
- Inter-fascicular cambium and intra-fascicular cambium together form vascular cambium, which also does not contribute to periderm formation.

7. **Conclusion**:
- Therefore, the correct answer to the question "Periderm is formed from" is **fallogen**.