Fruit - a ripened and mature ovary containing the seeds. Fruits also include adjacent parts from flowers which may be fused to the reproductive structures. Seed - a fertilized and ripened ovule. Consists of the embryo, nutritive tissues, and a seed coat. Ovaries contain ovules.
Ovules contain gametophytes which contain egg cells.
Pollen contains male gametophytes which produce and contain sperm cells. Pollen tubes grow through the stigmas and styles of female organs, eventually penetrating the ovary where the sperm is released to fertilize the eggs. This is a sex act and may involve birds and bees. By the time the fruit is formed, it is too late for birth control. Possible mechanisms involve use of offspring, growing into new areas.