( ( Light reactions ) ( ( take ( place ( on ( the ( thylakoid membranes ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Light) (NNS reactions)) (VP (VBP take) (NP (NP (NN place)) (PP (IN on) (NP (DT the) (JJ thylakoid) (NNS membranes))))) (. .)))
Light reactions take place on the thylakoid membranes.
(ROOT (S (NP (DT The) (JJ light) (NNS reactions)) (VP (VBP take) (NP (NP (NN place)) (PP (IN in) (NP (DT the) (NN thylakoid))))) (. .)))