Continued self-pollination results in

Cross-fertilisation is favoured by

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.

In Cleistogamous flowers . . . . . . .

Which of the following prevents pollen germination or pollen tube growth?

The phenomenon in which anther and stigma grow and mature at the same time is called: