Here's the breakdown:

* Gametes: These are the reproductive cells, specifically the sperm (male) and egg (female).

* Fertilization: This is the process where the sperm and egg fuse together.

* Zygote: The resulting cell from the fusion of the sperm and egg is called a zygote. This single cell contains all the genetic material necessary to develop into a new plant.

The zygote will then undergo repeated cell division and development, eventually forming a seed. The seed contains the embryo (the future plant) and a food source for it.