The resulting zygote develops into an embryo inside the ovule. In most flowering plants the female gametophyte within the ovule consists of only seven cells. Flowering plants (angiosperms) create embryos after the fertilization of a haploid ovule by pollen. The ovary is superior with one carpel containing a single erect anatropous ovule. The female gamete is produced inside the embryo sac of the ovule. It consists of one carpel and contains a single pendulous ovule. An integument is a protective layer of cells surrounding the ovule. This develops within an ovule, enclosed by the ovary at the base of a carpel. Anthers typically consist of four microsporangia and an ovule is an integumented megasporangium. The pollen tube releases two sperm nuclei into the ovule. The pollen grains mature further inside the ovule and produce sperm cells. These develop into a megagametophyte (often called the embryo sac) within the ovule. Each fertile scale usually has one apical ovule. The term ovule in animals is used for the young ovum of an animal. The female strobili also occur in whorls, with bracts which fuse around a single ovule.