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  3. Bacteria present in the root nodules of leguminous plants which fix atmospheric nitrogen to be used by the plant.

. Bacteria present in the root nodules of leguminous plants which fix atmospheric nitrogen to be used by the plant.

(a)Rhizobium

(b)Nostoc

(c)Azospirillum

(d)Acetobacter

Best Answer

Ans.(a)Rhizobium is the most well known species of a group of bacteria that acts as symbiotic fixer of nitrogen. These bacteria can infect the roots of leguminous plants forming nodules where nitrogen fixation takes place. The bacterial enzymes system supplies nitrogen to the host plant whereas gives nutrients and energy to the bacterium.

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