At the bottom of the style is a swelling which has the future seeds in it. This swelling is called the ovary. Each grain of pollen grows a tube down the style to try to fertilize a part inside the ovary. Then these parts, called ovules, can develop into seeds. If you have ever seen the silk on an ear of corn, you have seen very long pollen tubes which grew down into the corn flowers to pollinate each of the kernels on the ear of corn.
Flowers are one way some plants reproduce.
They help a plant population in an area mix its properties enough to be ready to survive changes in the environment. Teachers and other adults may want to look at the Pollination Adaptations page to learn more about how flower adaptations make them more attractive to pollinating animals. See also ESP Pollination Unit Resources and our Flowers page.