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

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:

Which of the following prevents self-pollination?

What is the benefit of outbreeding devices to plants?

Which of the following is $NOT$ an outbreeding device?

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