Self-pollination results in:

Cross-fertilisation is favoured by

Give scientific reasons: Outbreeding devices increase fertility.

$A$ dioecious flowering plant prevents both

Given below are two statements.
Statement $I$: Self-incompatibility is a device that prevents outbreeding.
Statement $II$: Self-incompatibility is a genetic mechanism due to which germination of pollen on the stigma of the same flower is inhibited.
In the light of the above two statements,choose the correct answer from the options given below.

Allogamy (cross-pollination) is best favoured by: