An injured meristem root will be replaced by

Options

A. dermatogen
B. Calyptrogen
C. quiescent centre
D. Promeristem

Answer

To answer the question "An injured meristem root will be replaced by," we will analyze the options provided and determine which one is correct based on the functions of each type of tissue.

### Step-by-Step Solution:

1. **Understanding Meristematic Tissues**:
- Meristematic tissues are regions in plants where cells are actively dividing. They are responsible for growth and the formation of new tissues.

2. **Evaluating the Options**:
- **Dermatogen**: This is a layer of the root meristem that gives rise to the epidermis (outer layer) of the root. Its primary function is not related to replacing injured meristematic tissue.
- **Calyptrogen**: This tissue is responsible for forming the root cap, which protects the growing tip of the root. Like dermatogen, it does not play a role in replacing injured meristematic tissue.
- **Promeristem**: This is a precursor to meristematic tissue and is involved in the formation of new meristematic cells. However, it does not directly replace injured meristematic tissue.
- **Quiescent Center**: This region is located within the apical meristem of the root. The cells in this area divide slowly or not at all under normal conditions. However, in the event of injury to the meristem, these cells can become active and start dividing rapidly to replace the damaged meristematic tissue.

3. **Conclusion**:
- Based on the functions of the tissues analyzed, the correct answer to the question is **Quiescent Center**. This tissue has the ability to replace the injured meristematic tissue by becoming meristematic and dividing quickly.

### Final Answer:
An injured meristem root will be replaced by the **Quiescent Center**.