( ( If ( ( the migration ) ( is ( toward ( ( the source ) ( of light ) ) ) ) ) ) ( , ( it ( ( is ( termed ( positive phototaxis ) ) ) ; ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (DT the) (NN migration)) (VP (VBZ is) (PP (IN toward) (NP (NP (DT the) (NN source)) (PP (IN of) (NP (NN light)))))))) (, ,) (NP (PRP it)) (VP (VBZ is) (VP (VBN termed) (NP (JJ positive) (NNS phototaxis)))) (: ;)))
If the migration is toward the source of light, it is termed positive phototaxis ;
(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))))))) (. .)))