Cleistogamy occurs in which plant?

What is self-incompatibility? Why does self-pollination not lead to seed formation in self-incompatible species?

Which of the following devices promote cross-pollination?
$(i)$ Non-synchronization of pollen release and stigma receptivity
$(ii)$ Anther and stigma are placed at different positions
$(iii)$ Monoecious plants
$(iv)$ Production of dioecious plants
$(v)$ Self-incompatibility
$(vi)$ Anther and stigma are placed close to each other
$(vii)$ Self-compatibility

Unisexuality of flowers prevents:

The dioecious condition prevents:

What is the outbreeding device,where the stamens and carpels mature at different times called?