Why are some plants having bisexual flowers show self incompatibility?

Explanation

### Step-by-Step Solution:

1. **Definition of Bisexual Flowers**:
- Bisexual flowers contain both male (stamens) and female (pistils) reproductive organs. This means they have the potential to self-pollinate.

2. **Understanding Self-Incompatibility**:
- Self-incompatibility is a mechanism that prevents self-fertilization, even in flowers that have both male and female parts. This is crucial for promoting genetic diversity.

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