( They ( ( ( ( are angiosperms ) , ) ( flowering ( plants ( which ( produce ( fruit ( that ( surrounds ( their seeds ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBP are) (ADJP (JJ angiosperms)) (, ,) (S (VP (VBG flowering) (NP (NP (NNS plants)) (SBAR (WHNP (WDT which)) (S (VP (VBP produce) (NP (NP (NN fruit)) (SBAR (WHNP (WDT that)) (S (VP (VBZ surrounds) (NP (PRP$ their) (NNS seeds))))))))))))) (. .)))
They are angiosperms, flowering plants which produce fruit that surrounds their seeds.
(ROOT (S (NP (NNS Angiosperms)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (VBG flowering) (NN seed) (NNS plants))))) (. .)))