A) Nitrobacter
B) Nitrosomonas
C) Rhizobium
D) Azotobacter
Correct Answer: C
Solution :
Root nodules contain nitrogen fixing bacteria (Rhizobium leguminosarum) which fix atmospheric free nitrogen in to ammonia. The fixed nitrogen is absorbed by the plant. In return, the plant provides food and shelter to bacteria. Such an association is called mutualistic symbiosis.
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