When the $F_1$ generation offspring is crossed with a dominant homozygous parent,what is it called?

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

Which of the following prevents self-pollination?

Which one of the following usually does $NOT$ promote self-pollination?

Continued self-pollination results in....

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