A) Rhizobium
B) Azotobacter
C) Frankia
D) Thiobacillus
Correct Answer: C
Solution :
A number of dicot non-leguminous higher plants also contain root nodules with the ability to fix nitrogen. The root nodules are formed as a result of symbiotic association with Actinomycetes belonging to the genus Frankia. The host plants of these include trees, shrubs and herbs including Cosuarina equisetifolia, Almus, Hippophae and Ceanothus.
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