Quiescent center in root meristem acts as

Options

A. Waiting meristems
B. Reserve meristems
C. Revervoir of growth hrmones
D. Both 1 or 2

Answer

### Step-by-Step Solution:

1. **Understanding the Quiescent Center**:
- The quiescent center is a specific region found in the root meristem of plants. It was first observed by a scientist named Claus in the plant species Zea mays (maize).
- This center consists of a group of cells that are inactive or quiescent, meaning they are not actively dividing.

2. **Location**:
- The quiescent center is located at the root apex, within the meristematic zone. The meristematic zone is where active cell division occurs, allowing for root growth.

3. **Functions of the Quiescent Center**:
- The primary functions of the quiescent center include:
- **Maintaining Meristematic Activity**: The quiescent center helps in preserving the meristematic tissue, which is crucial for the continuous growth of the root.
- **Cell Replacement**: In the event of injury to the root, the cells from the quiescent center can divide and differentiate to replace the damaged or lost cells, thus aiding in the healing process.

4. **Options Analysis**:
- The question provides several options regarding the function of the quiescent center:
1. Waiting meristem
2. Reserve meristem
3. Reservoir of growth hormones
4. Both 1 and 2

5. **Conclusion**:
- Based on the functions discussed, the quiescent center acts as both a waiting meristem (preserving meristematic activity) and a reserve meristem (providing cells for replacement during injury). Therefore, the correct answer is **both 1 and 2**.