(Top) Monocotyledon (internal structures of a corn seed with
stages of germination). Nutrients are stored in the cotyledon
and endosperm tissue. The radicle and hypocotyl (region between
the cotyledon and radicle) give rise to the roots. The epicotyl
(region above the cotyledon) gives rise to the stem and leaves
and is covered by a protective sheath (coleoptile). (Bottom)
Dicotyledon (internal structures of a bean seed with stages of
germination). All nutrients are stored in the enlarged
cotyledons. The radicle gives rise to the roots, the hypocotyl
to the lower stem, and the epicotyl to the leaves and upper
stem.