Primary meristems are present in the embryo. 

Example below : embryo in Zea mays caryopsis.

Embryo of Zea mays in a paraffine longitudinal section stained with toluidine blue 

In monocotyledons such as corn, embryo has only one cotyledon called scutellum in graminae. it is thin with a large contact surface with the endosperm, storage tissue from which it will absorb nutriments at germination. The embryo is surrounded by two sheats.The epicotyl bearing shoot apex and leaf primordia is called coleoptile. The root cap and the root apex are enclosed in a sheath called coleorhiza. Upon germination the coleoptile will be the first ones to emerge onto the ground before the young seedling.