Mustard and tomato are examples of hypogynous flower.

Answer

### Step-by-Step Solution:

1. **Understanding Hypogynous Flowers**:
- Hypogynous flowers are characterized by having the ovary positioned above the other floral parts such as petals and sepals. This means that the ovary is superior to the other floral structures.

2. **Identifying Examples**:
- Mustard (Brassica) and Tomato (Solanum lycopersicum) are two examples of plants that produce hypogynous flowers. In these flowers, the ovary is located at the top, and the petals and sepals are attached below it.

3. **Comparison with Other Flower Types**:
- To further understand hypogynous flowers, it is helpful to compare them with other types of floral arrangements:
- **Epigynous Flowers**: Here, the ovary is located at the bottom, and the other floral parts emerge from above it. Examples include Pumpkin and Cucumber.
- **Perigynous Flowers**: In this type, the ovary is positioned in the middle, with floral parts attached around its rim. An example of this is the Plum plant.

4. **Conclusion**:
- Since both mustard and tomato exhibit the characteristics of hypogynous flowers, the statement that they are examples of hypogynous flowers is indeed true.