A flowering plant
First, pollen falls on a flower's stigma. In time, the sperm cell and egg cell join together in the flower's ovule. The zygote develops into the embryo part of the seed.
The term "angio" in "angiosperm" comes from the Greek word "angeion," meaning "vessel" or "container." In the context of angiosperms, it refers to the presence of flowers and fruits, which serve as vessels for seeds. Angiosperms are characterized by their ability to produce seeds enclosed within a fruit, distinguishing them from gymnosperms, which have naked seeds.
In Gymnosperms, the seeds do not develop in an ovary - they aren't inside a fruit. Gymnosperm seeds develop either on the surface of scale/leaf-like appendages of cones, or at the end of short stalks. Two examples are conifers and cycads. In Angiosperms (flowering plants), the seeds are contained within some kind of fruit, the ovary.