Explain any two out breeding devices that flowering plants have developed to encourage cross pollination

Explanation

**Step-by-Step Solution:**

1. **Introduction to Out-Breeding Devices:**
- Out-breeding devices are mechanisms developed by flowering plants to promote cross-pollination, which increases genetic diversity and enhances the adaptability of plant species.

2. **First Out-Breeding Device: Declini (Unisexuality)**
- **Definition:** Declini refers to the production of unisexual flowers, meaning that a single flower is either male or female, but not both.
- **Example:** The papaya plant is a classic example where male and female flowers are produced on separate plants. This separation encourages cross-pollination since pollen must be transferred from male flowers to female flowers of different plants.
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