This allows water and nutrients to penetrate the seed coat

This lets moisture and nutrients get through the seed coat,making the embryo start growing until it breaks through.Now, you might be wondering why it is that plants would need humans to do all these weird things to their seeds in order to grow, and, in fact, they don't.
In natural environments,seed coats are worn down by cold temperatures,bacteria,or even animal digestion.Our scarification methods just mimick and accelerate these natural processes to increase the chances of successful germination.