Periderm is made up of

Options

A. Phellogen
B. Phellem
C. Phelloderm
D. All of these

Answer

**Step-by-Step Solution:**

1. **Understanding Periderm**: Periderm is a protective tissue that replaces the epidermis in plants during secondary growth. It is primarily found in woody plants.

2. **Components of Periderm**: Periderm is made up of three main components:
- **Cork (Phellem)**: This is the outermost layer of the periderm. It is composed of dead cells that are filled with suberin, a waxy substance that makes it water-resistant and protective against pathogens.
- **Cork Cambium (Phellogen)**: This is a lateral meristem that produces cork cells towards the outside and phelloderm towards the inside. It is responsible for the secondary growth of the periderm.
- **Phelloderm**: This is the inner layer produced by the cork cambium. It consists of living parenchyma cells that can store nutrients and provide some metabolic functions.

3. **Summary of Components**: Therefore, the periderm consists of:
- Cork (Phellem)
- Cork Cambium (Phellogen)
- Phelloderm

4. **Conclusion**: The periderm is made up of all these components: cork, cork cambium, and phelloderm.

**Final Answer**: Periderm is made up of cork (phellem), cork cambium (phellogen), and phelloderm.

---