Which are not true cells in the blood ? Why?

Explanation

Platelets are actually not true cells but merely circulating fragments of cells. But even though platelets are merely cell fragments, they contain many structures that are citical to stop bleeding. They contain proteins on their surface that allow them to stick to breaks in the blood vessel wall and also to sick to each other. they contain granules that can secrete other proteins required for creating a firm plug to seal blood vessel breaks.