( ( ( ( ( ( Least ( preferred parts ) ) ( of ( the plants ) ) ) , ) ( such ( as ( stems ( and ( large ( leaf veins ) ) ) ) ) ) ) , ) ( ( ( will not ) ( be ( attacked ( unless ( caterpillars ( are ( near starvation ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJ Least) (JJ preferred) (NNS parts)) (PP (IN of) (NP (DT the) (NNS plants))) (, ,) (PP (JJ such) (IN as) (NP (NN stems) (CC and) (JJ large) (NN leaf) (NNS veins))) (, ,)) (VP (MD will) (RB not) (VP (VB be) (VP (VBN attacked) (SBAR (IN unless) (S (NP (NNS caterpillars)) (VP (VBP are) (PP (IN near) (NP (NN starvation))))))))) (. .)))
Least preferred parts of the plants, such as stems and large leaf veins, will not be attacked unless caterpillars are near starvation.
(ROOT (S (NP (NNS Leaves)) (VP (VBP export) (NP (NN sugar)) (PP (TO to) (NP (NP (NNS roots)) (CC and) (NP (NP (JJ other) (JJ nonphotosynthetic) (NNS parts)) (PP (IN of) (NP (DT the) (NN plant)))))) (PP (IN through) (NP (DT the) (NNS veins)))) (. .)))