so seeds are carried to long distance away from parent, reduce competition between same species.
Wing like out growths from ovary walls, or leaf like structures, causing the fruit to spin as it falls from the ground. delay in fall lets the wind carry seed further.
black berry, cranberry, are eaten by birds and the pips are not digested when they pass out their droppings.
hooks form around floresence , catches in animal fur later to fall on the ground as animal moves about.
most do not require light with few exceptions needing light exposure to germinate.
early stages of germination is anerobic, once water enters and splits the testa allowing oxygen in. the oxygen is used for aerobic respiration to start chemical changes for cell growth.