Flowers are the reproductive structures found in flowering plants that facilitate reproduction through the union of sperm and eggs. Their biological function is to provide a mechanism for fertilization. Many flowers have evolved to attract animals to transfer pollen between flowers. After fertilization, the ovary of the flower develops into fruit containing seeds. In common usage, the term flower refers to the colorful, visible parts of plants like roses, orchids, and chrysanthemums that are used in floral arrangements and decorations due to their attractive blossoms. The essential parts of a flower include the vegetative petals and structures that make up the perianth, as well as the reproductive sexual parts arranged in four whorls - the perian