Angiosperm plants have seeds enclosed in protective structures. Most hardwood trees--including oaks--are angiosperms. An oak's seeds lie within its acorns. The acorn's caps and hard outer shells allow the seeds to survive for months, improving their chances of sprouting.
About this Author
A freelance writer, Judy Wolfe has owned Prose for the Pros, a freelance writing business, since 2006. She's been an inveterate traveler since 1961 and draws on her travel experiences to provide articles for such websites as Chincoteague Island Vacations and Berlin Dude. Wolfe holds a Bachelor of Arts in literature from California State University at Pomona.