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Many legumes have root nodules that provide a home for symbiotic nitrogen-fixing bacteria called rhizobia. This relationship is particularly common in nitrogen-limited conditions. The Rhizobia convert nitrogen gas from the atmosphere into ammonia, which is then used in the formation of amino acids and nucleotides .
cambium-a formative one-cell layer of tissue between xylem and phloem in most vascular plants that is responsible for secondary growth. fibrovascular bundle, vascular bundle, vascular strand-a unit strand of the vascular system in stems and leaves of higher plants consisting essentially of xylem and phloem.ambium-a formative one-cell layer of tissue between xylem and phloem in most vascular plants that is responsible for secondary growth. fibrovascular bundle, vascular bundle, vascular strand-a unit strand of the vascular system in stems and leaves of higher plants consisting essentially of xylem and phloem.