Can someone explain to me something (Plants)?

[Imazergling]

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what's the different between primary structure and secondary structure in plant stems and roots? Is secondary structure something that grows ON TOP of the primary structure?

 

[IsaacYankem]

http://bcs.whfreeman.com/thelifewire/content/chp35/35020.html

 

[jhcb]

Primary is the elongation (apical meristems), secondary is thickening (Involves cambium)