( ( b -RRB- ) ( ( ( -LRB- ( i -RRB- ) ) ( What ( do you ) ) ) ( ( understand ( by ( ( ( primary meristem ) and ) ( secondary meristem ) ) ) ) . ) ) )
(ROOT (S (LST (LS b) (-RRB- -RRB-)) (NP (NP (-LRB- -LRB-) (NNP i) (-RRB- -RRB-)) (SBAR (WHNP (WP What)) (S (VP (VBP do) (NP (PRP you)))))) (VP (VBP understand) (PP (IN by) (NP (NP (JJ primary) (NN meristem)) (CC and) (NP (JJ secondary) (NN meristem))))) (. .)))
b) (i) What do you understand by primary meristem and secondary meristem.
(ROOT (S (NP (NNS Roots)) (VP (VBP grow) (PP (IN in) (NP (NN length) (CC and) (NN width))) (PP (IN from) (NP (DT the) (JJ primary) (CC and) (JJ secondary) (NN meristem)))) (. .)))