The embryo in maize grain consists of a single cotyledon called a scutellum, a radicle, and a plumule. The radicle lies towards the pointed side of the embryonic region of the seed. It is covered by a protective sheath called coleorhiza. The plumule is located towards the upper side of the embryonic region opposite to radicle. It is also enclosed in a protective sheath known as coleoptile.