( ( ( ( Photosynthesis , ) ( ( the process ) ( ( by which ) ( plants ( ( convert ( ( the ( sun 's ) ) energy ) ) ( to glucose ) ) ) ) ) ) , ) ( ( ( ( takes place ) ( during ( daylight hours ) ) ) ( when ( ( ( the ( plant 's ) ) leaves ) ( are ( exposed ( to sunlight ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Photosynthesis)) (, ,) (NP (NP (DT the) (NN process)) (SBAR (WHPP (IN by) (WHNP (WDT which))) (S (NP (NNS plants)) (VP (VBP convert) (NP (NP (DT the) (NN sun) (POS 's)) (NN energy)) (PP (TO to) (NP (NN glucose))))))) (, ,)) (VP (VBZ takes) (NP (NN place)) (PP (IN during) (NP (NN daylight) (NNS hours))) (SBAR (WHADVP (WRB when)) (S (NP (NP (DT the) (NN plant) (POS 's)) (NNS leaves)) (VP (VBP are) (VP (VBN exposed) (PP (TO to) (NP (NN sunlight)))))))) (. .)))
Photosynthesis, the process by which plants convert the sun's energy to glucose, takes place during daylight hours when the plant's leaves are exposed to sunlight.
(ROOT (S (PP (IN During) (NP (NN photosynthesis))) (, ,) (NP (NP (NN energy)) (PP (IN from) (NP (DT the) (NN sun)))) (VP (VBZ is) (VP (VBN converted) (PP (TO to) (NP (NN glucose))) (PP (IN after) (S (VP (VBG entering) (NP (DT a) (NN plant))))))) (. .)))