( ( As ( we know ) ) ( , ( plants ( ( ( produce food ) ( by ( ( photosynthesis , ) ( which ( is ( ( ( the bonding ) ( together ( of ( ( carbon dioxide ) ( with water ) ) ) ) ) ( to ( ( make ( ( sugar and ) oxygen ) ) ( using ( ( the ( sun 's ) ) energy ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN As) (S (NP (PRP we)) (VP (VBP know)))) (, ,) (NP (NNS plants)) (VP (VBP produce) (NP (NN food)) (PP (IN by) (NP (NP (NN photosynthesis)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (NP (DT the) (NN bonding)) (PP (ADVP (RB together)) (IN of) (NP (NP (NN carbon) (NN dioxide)) (PP (IN with) (NP (NN water))))) (S (VP (TO to) (VP (VB make) (NP (NN sugar) (CC and) (NN oxygen)) (S (VP (VBG using) (NP (NP (DT the) (NN sun) (POS 's)) (NN energy)))))))))))))) (. .)))
As we know, plants produce food by photosynthesis, which is the bonding together of carbon dioxide with water to make sugar and oxygen using the sun's energy.
(ROOT (S (S (NP (NNS Photosynthesis)) (VP (VBZ is) (VP (VBN described) (PP (IN by) (NP (DT this) (NN statement)))))) (: :) (S (NP (NP (NN carbon) (NN dioxide)) (CC and) (NP (NN water))) (VP (VBP are) (VP (VBN turned) (PP (IN into) (NP (NN sugar) (CC and) (NN oxygen)))))) (. .)))
Photosynthesis is described by this statement: carbon dioxide and water are turned into sugar and oxygen.