MAHARASHTRA Class 9: Biogeochemical Cycles Videos | Natural Resources

Denitrification is the last step which is followed by nitrification in the nitrogen cycle.

Rhizobium, clostridium and anabaena are bacteria which fix nitrogen in the root nodules of leguminous plants.

When living organisms die, decomposers break down the dead body to release nitrogen as ammonia.

Carbon is found as carbon dioxide in the atmosphere, and as carbonate and bicarbonate salts in minerals.

Carbon returns to the atmosphere by respiration, burning of fossil fuels and decay of organic compounds.