What do you mean by dispersal of fruits and seeds ? Why is it necessary ? Is there any disadvantage of dispersal ?
 

The dispersal of seeds and fruits to different places is referred to as the seed dispersal and fruit dispersal respectively. Seeds and fruits are dispersed to far off places to reduce competition among plants for sunlight, water, minerals, and space.
The only disadvantage of dispersal mechanism is that the seeds and fruits are at higher risk to damage by insects and other pathogens.