( ( ( ( ( Phototaxis ( ( The ability ) ( of bacteria ) ) ) ( to ( ( detect changes ) ( in ( light intensity ) ) ) ) ) and ) ( respond ( by ( ( moving away ) ( ( ( from or ) toward ) ( the light ) ) ) ) ) ) . )
(ROOT (S (VP (VP (VB Phototaxis) (NP (NP (DT The) (NN ability)) (PP (IN of) (NP (NNS bacteria)))) (S (VP (TO to) (VP (VB detect) (NP (NNS changes)) (PP (IN in) (NP (JJ light) (NN intensity))))))) (CC and) (VP (VB respond) (PP (IN by) (S (VP (VBG moving) (PRT (RP away)) (PP (IN from) (CC or) (IN toward) (NP (DT the) (NN light)))))))) (. .)))
Phototaxis The ability of bacteria to detect changes in light intensity and respond by moving away from or toward the light.
(ROOT (S (NP (NNS Phototaxis)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (NN movement)) (PP (IN toward) (NP (NN light))))))) (. .)))