The seed is contained inside a fruit, which develops from the ovary. Fruits may be fleshy, as in an apple or cherry, or dry, as in grass or the helicopter-like winged seeds of sycamore and other maple trees.
Fruit develops after pollination causes hormonal changes.
The ovary wall becomes thick and is called the pericarp, while other flower parts often degenerate. This development, called fruit set, will not happen if the flower is not pollinated. Fruit ripens about the same time as the seed is finishing its development. Ripening might be aging of tissues which releases the seeds in a dry fruit, or the colour change anbd softening caused by hormones in a fleshy fruit. Fruit that is derived from a singel ovary is called a simple fruit, like a cherry or a soybean pod.