Meristems may be classified on the basis of

Options

A. Origin and development
B. Position in plant body
C. Functions
D. All of these

Answer

### Step-by-Step Solution:

1. **Understanding Meristems**:
- Meristems are specialized tissues in plants that consist of undifferentiated cells. These cells have the ability to divide and differentiate into various types of cells.

2. **Classification of Meristems**:
- Meristems can be classified based on several criteria. The primary classifications include:
- **Origin and Development**: This refers to whether the meristem is primary (developing from the embryo) or secondary (developing from existing tissues).
- **Position**: This classification is based on where the meristem is located in the plant. For example, apical meristems are found at the tips of roots and shoots, while lateral meristems are found along the sides of stems and roots.
- **Functions**: Meristems can also be classified based on the functions they perform, such as growth in length (apical meristems) or growth in thickness (lateral meristems).

3. **Conclusion**:
- Since meristems can be classified based on origin and development, position, and functions, the correct answer to the question is that meristems may be classified on the basis of all these criteria. Therefore, the correct answer is option 4, which states "all of these."