Skin of potato is a familiar example of

Options

A. phellogen
B. phellem
C. phelloderm
D. duramen

Answer

To answer the question "Skin of potato is a familiar example of," we will analyze the options provided and understand the relevant biological terms.

### Step-by-Step Solution:

1. **Understanding the Options**: The options given are phallogen, phallum, phalloderm, and duramine. We need to identify which of these terms relates to the skin of the potato.

2. **Defining Cork Cambium**: The cork cambium is also known as phallogen. It is responsible for the secondary growth in plants, particularly in the formation of the outer protective layer.

3. **Role of Phallogen**: The phallogen (cork cambium) produces cork cells (phallum) towards the outside and secondary cortical cells (phalloderm) towards the inside.

4. **Identifying Cork Cells**: The cork cells that are produced by the phallogen are suberized, meaning they have a waxy coating that helps in water retention and protection. These cork cells make up the phallum.

5. **Understanding Phalloderm**: The secondary cortical cells produced by the phallogen are known as phalloderm, which is the inner layer.

6. **Clarifying Duramine**: Duramine refers to the heartwood or central wood of a tree trunk, which is not related to the skin of the potato.

7. **Conclusion**: Since the skin of the potato is primarily composed of cork cells, the correct answer is phallum.

### Final Answer:
The skin of the potato is a familiar example of **phallum**.