Papaya plants is dioecious.

Answer

### Step-by-Step Solution:

1. **Understanding Dioecious Plants:**
- Dioecious plants are those that have male and female reproductive structures on separate individuals. This means that one plant will produce only male flowers, while another plant will produce only female flowers.

2. **Identifying Papaya as Dioecious:**
- In the case of papaya (Carica papaya), it is classified as a dioecious plant. This means that to have fruit production, both male and female plants must be present in proximity to facilitate pollination.

3. **Male and Female Flowers:**
- Male papaya plants produce male flowers, which are typically smaller and grow in clusters. These flowers are responsible for producing pollen.
- Female papaya plants produce female flowers, which are larger and are capable of developing into fruit once pollinated.

4. **Pollination Process:**
- For fruit to develop on female papaya plants, pollen from male flowers must reach the female flowers. This can occur through wind or pollinators like bees.

5. **Conclusion:**
- Therefore, the statement "Papaya plants are dioecious" is true, as it accurately describes the reproductive structure of papaya plants where male and female flowers are found on separate plants.