How does the production of unisexual flowers prevent self-pollination?

Explanation

### Step-by-Step Solution:

1. **Understanding Unisexual Flowers**: Unisexual flowers are those that contain either male (staminate) or female (pistillate) reproductive parts, but not both. This means that a flower will either produce pollen or ovules, but not both.

2. **Separation of Reproductive Parts**: In plants that produce unisexual flowers, the male and female flowers are typically found on different plants (dioecious species) or on different parts of the same plant (monoecious species). This physical separation is crucial in preventing self-pollination.

3. **Mechanism of Pollination**: Since unisexual flowers do not have both male and female reproductive structures in the same flower, pollination cannot occur within the same flower. For fertilization to happen, pollen must be transferred from a male flower to a female flower.

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