( ( Are ( necessary ( for ( optimal ( plant growth ) ) ) ) ) . )
(ROOT (S (VP (VBP Are) (ADJP (JJ necessary) (PP (IN for) (NP (JJ optimal) (NN plant) (NN growth))))) (. .)))
Are necessary for optimal plant growth.
(ROOT (S (NP (NNP Plant) (NNP nutrition)) (VP (VBZ is) (NP (NP (DT the) (NN study)) (PP (IN of) (NP (NP (DT the) (JJ chemical) (NNS elements)) (ADJP (JJ necessary) (PP (IN for) (NP (NN plant) (NN growth)))))))) (. .)))