Question

the sheath which encloses the radical in Maize seed​

Answer 1

The outer covering of the endosperm separates the embryo by a proteinous layer called aleurone layer. The embryo has one large and shield shaped cotyledon known as scutellum. The seed contains plumule and radical. Plumule and radical are enclosed in sheaths which are called coleoptile and coleorhiza respectively.