( Embryo ( ( sac ( ( ( The ( embryo sac ) ) ( of ( a plant ) ) ) ( lies ( within ( the ovule ) ) ) ) ) ; ) )
(ROOT (S (NP (NN Embryo)) (VP (VBD sac) (SBAR (S (NP (NP (DT The) (NN embryo) (NN sac)) (PP (IN of) (NP (DT a) (NN plant)))) (VP (VBZ lies) (PP (IN within) (NP (DT the) (NN ovule))))))) (: ;)))
Embryo sac The embryo sac of a plant lies within the ovule;
(ROOT (S (NP (NP (DT The) (JJ amniotic) (NN sac)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBD was) (VP (VBG sitting) (PP (IN on) (NP (NP (NN top)) (PP (IN of) (NP (DT the) (JJ flat) (NN embryo))))))))) (, ,)) (VP (VBZ envelops) (NP (DT the) (NN embryo)) (SBAR (IN as) (S (NP (PRP it)) (VP (VBZ folds))))) (. .)))