Question

why scar is present in a seed

Answer 1

 seed might be just starting out in the world, but it has already developed at least one scar. The seed scar, also called the hilum, is a small mark, usually an oval with a line at the center, that marks where the seed was once attached to the mother plant, just as a child has an umbilical scar, or belly button, where he was once attached to his mother. In a seed with a pointed tip, it is often a little nub at the point of the tip