Ncert Exercises & Solutions

37. 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.

Formation of Root Nodule The coordinated activities of the legume and the Rhizobium bacteria depend on the chemical interaction between the symbiotic partners.

The principle stages in the nodule formation are summerisedin the following diagram

Leg haemoglobin is an oxygen scavenger, it protects nitrogenase enzyme from O₂ and also creates anaerobic conditions for the reduction of N₂ to NH₃ by Rhizobium.

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