The seeds of flowering plants, angiosperms, have similar parts. the part of the seed that is responsible for protecting the developing embryo, that often keep the seed dormant until the best growing conditions exist, and may hold all parts together is the

Seeds perform various functions for the plants that generate them, among them the essential function is dispersal to a new location, nourishment of the embryo, and dormancy at the time of inappropriate conditions.  

Seed coat is the part of the seed that protects the seed from temperature-associated, physical, or water destruction, it helps in the protection of developing embryo, and it is the seed coat, which makes sure that the plant seed remains in a dormant state until the circumstances become ideal for the plant embryo to sprout or germinate.