Lenticel and its complementary cells are developed through the activity of

Options

A. Phellogen
B. Stelar cambium
C. Dermatogen
D. Intercalary meristem

Answer

### Step-by-Step Solution:

1. **Understanding Lenticels**: Lenticels are small openings found on the surface of stems and other plant parts. They play a crucial role in gas exchange and transpiration.

2. **Identifying the Role of Phellem and Phellogen**: Lenticels are formed from the activity of a specific tissue called phellem, which is produced by the phellogen. Phellem is also known as cork, and it is part of the periderm.

3. **Formation of Lenticels**: The phellogen (cork cambium) divides to produce phellem cells. In certain areas, the phellogen's activity leads to the formation of lenticels, which are essentially regions where the phellem is less dense, allowing for gas exchange.

4. **Complementary Cells**: Alongside lenticels, there are complementary cells that also assist in the gas exchange process. These cells are typically parenchyma cells that provide support and facilitate the movement of gases.

5. **Conclusion**: Therefore, the correct answer to the question is that lenticels and their complementary cells are developed through the activity of phelogen.

### Final Answer:
Lenticels and their complementary cells are developed through the activity of **phelogen**.

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