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There are other ways of spreading seeds. If I just put the name of this one people might think I was joking so here's a wiki page.http://en.wikipedia.org/wiki/Squirting_cucumber
This is called explosive or mechanical dispersal and is another example of plants harnessing energy from the sun. It is commonly used by legumes such as peas and beans but also by other plants. Seed pods are dried out by heat from the Sun which builds up tension in their walls. Eventually this tension splits the walls into two halves which recoil backwards like a spring firing the seeds sometimes over 10m.
I know of a plant which does this spectucularly - Himalayan Balsam. A weedy looking plant with purple flowers. When the seed pods are ripe even the smallest touch is enough for them to explode. Presumably this evolved to be triggered by passing animals or strong gusts of wind. Its fun to pick them gently then throw them at people so that they explode when they hit them!