Concept
Version 5
Created by Boundless
The Legume-Root Nodule Symbiosis
![Root Nodules](../../../../../../../../../figures.boundless-cdn.com/10684/full/ago-italica-root-nodules-2.jpeg)
Root Nodules
Root nodules are formed when nitrogen fixing bacteria called rhizobia enter the cells of a host plant.
Source
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"Medicago italica root nodules 2."
http://en.wikipedia.org/wiki/File:Medicago_italica_root_nodules_2.JPG
Wikipedia
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