( ( ( ( ( ( The ( polar nuclei ) ) ( ( provide nourishment ) ( to ( the embryo ) ) ) ) , ) and ) ( that ( suggests ( that ( ( when ( pollen ( fertilizes ( the ( polar nuclei ) ) ) ) ) ( , ( it ( ( contributes greatly ) ( to ( ( the ( plant 's ) ) ( early development ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (DT The) (JJ polar) (NNS nuclei)) (VP (VBP provide) (NP (NN nourishment)) (PP (TO to) (NP (DT the) (NN embryo))))) (, ,) (CC and) (S (NP (DT that)) (VP (VBZ suggests) (SBAR (IN that) (S (SBAR (WHADVP (WRB when)) (S (NP (NN pollen)) (VP (VBZ fertilizes) (NP (DT the) (JJ polar) (NN nuclei))))) (, ,) (NP (PRP it)) (VP (VBZ contributes) (ADVP (RB greatly)) (PP (TO to) (NP (NP (DT the) (NN plant) (POS 's)) (JJ early) (NN development)))))))) (. .)))
The polar nuclei provide nourishment to the embryo, and that suggests that when pollen fertilizes the polar nuclei, it contributes greatly to the plant's early development.
(ROOT (S (NP (DT The) (NN embryo)) (VP (VBZ develops) (PP (IN in) (NP (NP (DT a) (NN plant)) (PP (IN inside) (NP (DT the) (JJ female) (NN plant))))) (PP (IN after) (NP (NN fertilization)))) (. .)))