The Correct names at ‘X’, ‘Y’ & ‘Z’ respectively are
X-Endosperm, Y-Pericarp, Z-Scutellum
X-Pericarp, Y-Endosperm, Z-Scutellum
X-Scutellum, Y-Endosperm, Z-Pericarp
X-Endosperm, Y-Scutellum, Z-Pericarp
X-Endosperm, Y-Pericarp, Z-Scutellum of grass seed or grain.