A) Azotobacter
B) Nitrobacter
C) Lactobacillus
D) Rhizobium
Correct Answer: D
Solution :
The German physiologist Heleriegel and Wilfarth (1886) found that bacteria inhabiting the nodules of legumes were responsible for the nitrogen fixation. The bacterium Rhizobium leguminosarum lives symbiotically in the roots of the leguminous plants. The bacterium Rhizobium infects the root hairs of pulse crops.
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