Biology · HSEXUAL REPRODUCTION IN FLOWERING PLANTS

Self-incompatibility in flowering plants is an outbreeding mechanism that:

1. A
   Is a morphological barrier preventing anthers and stigma from touching each other
2. B
   Is a genetic mechanism that prevents self-pollen from fertilising ovules by inhibiting pollen germination or pollen tube growth in the pistil
3. C
   Causes synchrony between pollen release and stigma receptivity
4. D
   Promotes the development of cleistogamous flowers