The pollen grain makes its way towards the embryo sac down the style of the ovary. The tube nucleus develops into a pollen tube which with the help of digestive enzymes that can break away through the style travels down towards the embryo sac.

Once the two pollen gametes reach the embryo sac, one of them fertilises the egg to create the zygote which will develop into the actual new plant, while the other pollen nucleus has a threesome with the two polar nuclei to form the triploid endosperm which provides the nutrients for the zygote later in development.

And then this little thing is a seed! And there may be many of them within an ovary which then…