( ( ( ( ( He ( observed ( that ( ( flowers ( that ( are ( pollinated ( by ( the wind ) ) ) ) ) ) ( have ( little color ) ) ) ) ) ) , ) yet ) ( ( flowers ( that ( need ( to ( attract ( insects ( for pollination ) ) ) ) ) ) ) ( ( have brightly ) ( colored ( ( ( petals and ) sweet ) nectar ) ) ) ) ) . )
(ROOT (S (S (NP (PRP He)) (VP (VBD observed) (SBAR (IN that) (S (NP (NP (NNS flowers)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (VP (VBN pollinated) (PP (IN by) (NP (DT the) (NN wind)))))))) (VP (VBP have) (NP (JJ little) (NN color))))))) (, ,) (CC yet) (S (NP (NP (NNS flowers)) (SBAR (WHNP (WDT that)) (S (VP (VBP need) (S (VP (TO to) (VP (VB attract) (NP (NP (NNS insects)) (PP (IN for) (NP (NN pollination))))))))))) (VP (VBP have) (ADVP (RB brightly)) (VP (VBN colored) (NP (ADJP (JJ petals) (CC and) (JJ sweet)) (NN nectar))))) (. .)))
He observed that flowers that are pollinated by the wind have little color, yet flowers that need to attract insects for pollination have brightly colored petals and sweet nectar.
(ROOT (S (NP (NP (NNS Flowers)) (VP (VBN pollinated) (PP (IN by) (NP (NN wind))))) (ADVP (RB generally)) (VP (VBP lack) (NP (JJ brightly) (VBN colored) (NNS parts))) (. .)))