HORTICULTURE

Detailed explanation-1: -During biological nitrogen fixation, inactivation of nitrogenase by oxygen posioning is prevented by leghaemoblocin. It is a red-pigment that is filled ouside the peribacteroid space In the cytosol of nodule cells. It is similar to haemoglobin of red blood cells.

Detailed explanation-2: -Leghaemoglobin is an oxygen scavanger. It combines with oxygen and protects nitrogenase, which catalyses the fixation of nitrogen under anaerobic conditions.

Detailed explanation-3: -Leghemoglobin buffers the concentration of free oxygen in the cytoplasm of infected plant cells to ensure the proper function of nitrogenase in the root nodules.