The correct option representing the structures forming phellogen , phellem and phelloderm is

Options

A. Phellogen : Cork cambium , Phellem, Secondary cortex and Phelloderm : Cork Secondary cortex and phelloderm : Cork
B. Phellogen : Cork cambium , Phellem: Cork and Phelloderm : Secondary cortex
C. Phellogen : Cork , Phellem: Secondary cortex and Phelloderm : Cork cambium
D. Phellogen : Secondary cortex , Phellem : Cork and Phellderm : cork cambium

Answer

To solve the question regarding the structures forming phellogen, phellem, and phelloderm, we need to understand what each of these terms refers to in plant anatomy.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Phellogen**: This is also known as cork cambium. It is a layer of meristematic tissue that produces cork cells (phellem) on the outside and phelloderm on the inside.
- **Phellem**: This is the outer layer of the periderm, commonly referred to as cork. It is produced by the phellogen and consists of dead cells that provide protection.
- **Phelloderm**: This is the inner layer produced by the phellogen. It consists of living parenchyma cells that may store food and provide some support.

2. **Identifying the Correct Match**:
- We need to match:
- Phellogen with cork cambium
- Phellem with cork
- Phelloderm with secondary cortex or living tissue.

3. **Analyzing the Options**:
- **Option 1**: Phellogen (cork cambium), Phellem (secondary cortex), Phelloderm (cork) - Incorrect.
- **Option 2**: Phellogen (cork cambium), Phellem (cork), Phelloderm (secondary cortex) - Correct.
- **Option 3**: Phellogen (cork cambium), Phellem (secondary cortex), Phelloderm (cork cambium) - Incorrect.
- **Option 4**: Phellogen (secondary cortex), Phellem (cork), Phelloderm (cork cambium) - Incorrect.

4. **Conclusion**:
- The correct option that accurately represents the structures forming phellogen, phellem, and phelloderm is **Option 2**: Phellogen (cork cambium), Phellem (cork), Phelloderm (secondary cortex).