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Trace the events starting from the comin...

Trace the events starting from the coming in contact of Rhizobium to a leguminous root till nodule formation. Add a note on importance of leg haemoglobin.

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Leg haemoglobin is an oxygen scavenger, it protects nitrogenase enzyme from `O_(2)` and also creates anaerobic conditions for the reduction of `N_(2)` to `NH_(3)` by Rhizobium.
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In root nodules of lengumes, leg-haemoglobin is important because