Histogens can be observed in

Options

A. Secondary meristem
B. Lateral meristem
C. Apical meristem
D. Intercalary meristem

Answer

### Step-by-Step Solution:

1. **Understanding Histogens**: Histogens are defined as specific zones or regions of primary tissue in plants that give rise to particular parts. They are crucial for the development of various plant structures.

2. **Identifying the Types of Meristems**: The question provides four types of meristems:
- Secondary meristem
- Lateral meristem
- Epical meristem
- Intercalary meristem

3. **Defining Epical Meristem**: The epical meristem is located at the growing tips of roots and shoots. It is responsible for the primary growth of the plant, leading to an increase in length.

4. **Understanding the Calypsogen**: The Calypsogen is a specific histogen layer found at the tips of roots, composed of three types of initial cells:
- Plerome (which gives rise to vascular tissues)
- Periblem (which forms the cortex)
- Dermatogen (which develops into the epidermis)

5. **Conclusion**: Since histogens, specifically the Calypsogen, are found in the epical meristem, we can conclude that the correct answer is the epical meristem.

### Final Answer:
Histogens can be observed in the **Epical meristem**.

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