Chasmogamy:
1. In chasmogamy, the flowers opens and express its mature anthers and stigma for pollination.
2. Self-pollination is uncertain
3. Depend on pollinating agents
4. Example: Hibiscus
Cleistogamy:
1. In cleistogamy the pollination occurs without opening of flowers and exposing their sex organs.
2. Self pollination is certain.
3. No need of pollinating agents.
4. Example: Commelina
