Some plants like ecballium elaterium, distinguished for the explosive fruit. But why is it doing this; But of course to disperse their seeds. Other plants, the seeds are dispersed via various agents, as gravity, wind, the water, animals, or the people. But they have to do it using 'mechanical' means.

In the case of violet, the fruit dries slowly causing a lateral pressure on very smooth seeds. When the pressure is too high, the seeds are expelled violently. For ecballium elaterium, the fruits are under pressure (6 bar, much more than a car tire). When the stalk comes off, The pressure causes a powerful explosion that ejects the seeds at a distance of 12 meters at a speed of 10 meters / second.