What is stored in the ovary of the pistil?

The ovary of the pistil in a flower is responsible for producing and storing ovules, which develop into seeds upon fertilization. The ovules are the female gametes; they contain the egg cell that, when fertilized by pollen (the male gamete), will lead to the formation of seeds. This is a crucial aspect of the reproductive process in flowering plants, as seeds carry the genetic material necessary for the development of new plants.

In the context of the other choices, pollen is produced by the male organs of the flower (the stamens) and is not housed in the ovary. Fruit develops from the fertilized ovary after ovules have been successfully fertilized and mature, but prior to fertilization, the ovary itself contains only the ovules. Similarly, stamens are separate structures involved in reproduction but do not reside in the ovary. Therefore, ovules are the specific structures stored within the ovary that fulfill a vital role in the plant's reproductive cycle.