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Vascular have a system that is intricate and the plant can move water to distribute it to the whole plant. Vascular plants are able to grow bigger due to this ability. 
Ex: Trees, flowers 

Nonvascular plants are usually small plants that are close to the ground. They do not have a very complex water distribution and for this reason cannot support large growth. 
Ex: moss 

hope these answers will help.. you.. :D