For a monoecious plant,which of the following is true?

Allogamy (cross-pollination) is best favoured by:

Which one of the following characteristics promotes cross-pollination?

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

Maturation of male and female sex organs at different times in a flower is called

In some plants,stigma and anther mature at different times because