Continuous self-pollination in a species leads to:

Heterostyly is a contrivance for . . . . . . .

Self-pollination results in:

Flowers preventing self-pollination is called

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:

Give scientific reasons: Outbreeding devices increase fertility.