The zygote or oospore elongates and then divides transversely to form basal and terminal cells. The basal cell (towards micropylar end) produces a large swollen, vesicular suspensor cell. It may function as haustorium. the terminal cells divides by another transverse wall to form two cells. The top cells after a series of divisions forms plumule and a single cotyledon. cotyledon called scutellum, grows rapidly and pushes the terminal plumule to one side. the plumule comes to lie in a depression. the middle cell, after many divisions forms hypocotyl and radicle. it also adds a few cells to suspensor. in some cereals both plumule and radicles get covered by sheaths developed from scutellum called coleoptile and coleorhiza respectively.