Periblem forms

Options

A. endodermis
B. cortex
C. both 1 and 2
D. epidermis

Answer

### Step-by-Step Solution for the Question: "Periblem forms"

1. **Understanding the Context**: The question revolves around the role of periblem in the anatomy of flowering plants. The periblem is one of the three types of meristematic tissues described in Henstein's Histogen theory.

2. **Histogen Theory**: According to Henstein’s Histogen theory, the root is composed of three principal tissues:
- Vascular Cylinder
- Cortex
- Epidermis

3. **Meristematic Tissues**: These tissues originate from three groups of meristematic cells known as histogens:
- **Dermatogen**: Responsible for forming the outermost layer (epidermis).
- **Pleurome**: Responsible for forming the innermost layer (vascular tissues including pith).
- **Periblem**: Responsible for forming the middle layer.

4. **Role of Periblem**: The periblem specifically contributes to the formation of:
- Hypodermis
- Cortex
- Endodermis

5. **Conclusion**: Therefore, the periblem is responsible for forming the middle layers of the root structure, which includes the cortex and endodermis.

6. **Answer Selection**: Based on the information provided, the correct answer to the question about what periblem forms is:
- Both cortex and endodermis.