Dermtogen, periblem and plerome are

Options

A. permanetn tissues
B. meristematic tissues
C. intercalary tissues
D. Secondary tissues

Answer

**Step-by-Step Solution:**

1. **Understanding the Terms**: Dermatogen, Periblem, and Plerome are terms related to plant anatomy, specifically in the context of meristematic tissues.

2. **Histogen Theory**: These terms are derived from the Histogen Theory proposed by Henstein. This theory explains how different layers of tissues in roots are formed from specific groups of meristematic cells.

3. **Dermatogen**: This is the outermost layer of meristematic tissue. It gives rise to the epidermis of the plant. The name "Dermatogen" can be remembered as it relates to "derma," which means skin, indicating its role in forming the outer protective layer.

4. **Periblem**: This is the middle layer of meristematic tissue. It contributes to the formation of the cortex and endodermis. The term "Periblem" can be associated with the middle layer of tissues.

5. **Plerome**: This is the innermost layer of meristematic tissue. It is responsible for forming the vascular tissues, which include xylem and phloem. The term "Plerome" can be linked to the vascular system of the plant.

6. **Classification**: All three of these tissues (Dermatogen, Periblem, and Plerome) are classified as meristematic tissues because they are involved in the growth and development of the plant.

7. **Conclusion**: Therefore, Dermatogen, Periblem, and Plerome are types of meristematic tissues that contribute to the formation of different layers in the root structure of flowering plants.

**Final Answer**: Dermatogen, Periblem, and Plerome are types of meristematic tissues.

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