In which of the following mechanisms is there a physical barrier between the stigma and the anther in bisexual flowers?

What is the benefit of outbreeding devices to plants?

Both autogamy and geitonogamy can be prevented in

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.

The maturation of male (anthers) and female (stigma) reproductive structures at different times in the same flower (in order to reduce the possibility of self-pollination) is called:

In plants,in nature,autogamy is avoided because the seeds produced: