A) convert atmospheric \[{{N}_{2}}\] to \[N{{H}_{3}}\]
B) convert ammonia to nitrite
C) transport oxygen for activity of nitrogenase
D) protect nitrogenase from oxygen
Correct Answer: D
Solution :
In the nodule, precise \[{{O}_{2}}\] levels are controlled by the \[{{O}_{2}}\] binding protein leghaemoglobin. This red iron containing protein is present in healthy nitrogen fixing nodules of leguminous plants. Leghaemoglobin functions as an ?oxygen buffer? cycling between the oxidized \[(F{{e}^{+3}})\] and reduced \[(F{{e}^{+2}})\] forms to keep free \[{{O}_{2}}\] levels within the ovule low. The ratio of leghaemoglobin bound \[{{O}_{2}}\] to free \[{{O}_{2}}\] in the root nodule is on the order of 10, 000 : 1. Nitrogenase enzyme, presents in root nodules mainly takes part in nitrogen fixation process. This enzyme becomes inactive in higher concentration of \[{{O}_{2}}\].
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