Solution: Self-incompatibility refers to a genetically controlled mechanism, where pollen grains are unable to completely grow on the stigma of the flower. This process prevents self-pollination and promotes cross-pollination in flowers.
Self-pollination cannot lead to the formation of seeds in a self-incompatible species. This is because self-incompatibility leads to the inability to produce a zygote that would develop into an embryo and hence form seeds.