This is quite interesting, I believe. It is basically a result of the fact that plants are sessile, meaning couch potatoes, and animals are mobile. Plants don't mind being sessile until they need to disperse their seeds to far away places, so evolution has come up with many strategies to disperse their seeds. The famous tumbleweed in western movies simply cuts itself loose from its roots and blows all over the plains, sowing seeds everywhere it goes. Dandelions attach a little parachute to each seed, to the delight of small children. Maples try the helicopter route, while cockleburrs and other similar plants use stickers to attach their seeds onto animal fur to hitch a ride. Impatiens slingshot their seeds into the air. But one of the best ways is to entice an animal to EAT your seeds, enclosing them in a very hard seed coat that is impervious to digestive juices, so they pass right through the animal. They are then deposited on the ground far away, complete with a little pile of fertilizer as well, to help the little seedlings get off to a really good start!! Fruit is a bribe, to entice us animals to disperse their seeds!