( ( ( The cultivation ) ( of ( ( ( simple zero ) varieties ) ( -LRB- ( 0-varieties -RRB- ) ) ) ) ) ( ( is ( based ( on ( ( the elimination ) ( of ( ( ( erucid acid ) , ) ( a ( long-chained ( unsaturated ( fatty acid ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN cultivation)) (PP (IN of) (NP (NP (ADJP (JJ simple) (NP (CD zero))) (NNS varieties)) (PRN (-LRB- -LRB-) (ADJP (JJ 0-varieties)) (-RRB- -RRB-))))) (VP (VBZ is) (VP (VBN based) (PP (IN on) (NP (NP (DT the) (NN elimination)) (PP (IN of) (NP (NP (JJ erucid) (NN acid)) (, ,) (NP (DT a) (JJ long-chained) (JJ unsaturated) (NN fatty) (NN acid)))))))) (. .)))
The cultivation of simple zero varieties (0-varieties) is based on the elimination of erucid acid, a long-chained unsaturated fatty acid.
(ROOT (S (NP (JJ Unsaturated) (NN fatty) (NNS acids)) (VP (VBP have) (NP (NN bent) (NNS chains))) (. .)))
Unsaturated fatty acids have bent chains.