Biology · HSEXUAL REPRODUCTION IN FLOWERING PLANTS

In flowering plants, self-incompatibility as an outbreeding device functions as a:

1. Mechanical barrier preventing anther and stigma from coming into physical contact
2. Temporal non-synchrony between pollen release and stigma receptivity
3. Genetic mechanism inhibiting pollen germination or pollen tube growth in the pistil
4. Morphological adaptation resulting in the production of unisexual flowers