( ( In ( these plants ) ) ( , ( ( an embryo ) ( ( ( forms ( without ( ( the fertilization ) ( of ( an ( egg cell ) ) ) ) ) ) ( by ( a ( pollen cell ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT these) (NNS plants))) (, ,) (NP (DT an) (NN embryo)) (VP (VBZ forms) (PP (IN without) (NP (NP (DT the) (NN fertilization)) (PP (IN of) (NP (DT an) (NN egg) (NN cell))))) (PP (IN by) (NP (DT a) (NN pollen) (NN cell)))) (. .)))
In these plants, an embryo forms without the fertilization of an egg cell by a pollen cell.
(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)))) (. .)))