Opuntia is a mesophytic plant.

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question states that Opuntia is a mesophytic plant. We need to determine if this statement is true or false.

2. **Defining Opuntia**: Opuntia is a genus of cacti commonly known as prickly pear. It belongs to the family Cactaceae.

3. **Identifying Plant Types**:
- **Mesophytic Plants**: These plants thrive in moderate moisture conditions, neither too dry nor too wet.
- **Xerophytic Plants**: These plants are adapted to survive in dry environments with limited water availability.

4. **Analyzing Opuntia's Habitat**: Opuntia is typically found in arid and semi-arid regions, which indicates that it is adapted to dry conditions.

5. **Conclusion**: Since Opuntia is adapted to dry environments and is classified as a xerophytic plant, the statement that Opuntia is a mesophytic plant is false.

6. **Final Answer**: Therefore, the answer to the question is **False**.