( ( These pigments ) ( usually ( ( ( ( are ( red ( in ( acid solution ) ) ) ) and ) ( may ( ( ( become purplish ) ( to blue ) ) ( if ( ( ( the pH ) ( of ( the ( cell sap ) ) ) ) ( is increased ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (DT These) (NNS pigments)) (ADVP (RB usually)) (VP (VP (VBP are) (ADJP (JJ red) (PP (IN in) (NP (JJ acid) (NN solution))))) (CC and) (VP (MD may) (VP (VB become) (NP (NN purplish)) (PP (TO to) (NP (NN blue))) (SBAR (IN if) (S (NP (NP (DT the) (NN pH)) (PP (IN of) (NP (DT the) (NN cell) (NN sap)))) (VP (VBZ is) (VP (VBN increased)))))))) (. .)))
These pigments usually are red in acid solution and may become purplish to blue if the pH of the cell sap is increased.
(ROOT (S (PP (IN As) (NP (NN ph) (NNS increases))) (, ,) (NP (DT a) (NN solution)) (VP (VBZ becomes) (ADJP (RBR more) (JJ basic))) (. .)))