What is the benefit of outbreeding devices to plants?

Given below are two statements:
Statement $I$: In heteromorphic flowers,pollen grains produced from anther pollinate stigmas produced at same level.
Statement $II$: In Tobacco,the germination of pollen on the stigma of the same flower is inhibited.
In the light of above statements,select the correct option given below:

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

The devices to discourage self-pollination are:

When male and female flowers are produced on different plants in a species,the condition is called:

What do plants develop various devices to promote?