A) nitrogen fixation
B) protecting nitrogenase from \[{{O}_{2}}\]
C) destroys bacteria
D) transport of food in plants
Correct Answer: B
Solution :
[b] The root nodules of leguminous plants contain a symbiotic nitrogen fixing bacteria Rhizobium. Root nodules are small irregular outgrowth of the roots which are pinkish internally due to presence of a pigment called leghaemoglobin. It is related to blood pigment haemoglobin. The cells of root nodules are tetraploid and contain polyhedral bacteria called bacteroids. Leghaemoglobin is an oxygen scavenger and protects the nitrogen fixing enzyme nitrogenase of bacteroids.
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