Look at the scanned Qs from Paper 2 SPM 2009 and please go through the suggested answer....
-Nitrogen fixing bacteria in root nodules of leguminous plats use nitrogen in the air to make nitrates.
-Nitrates then are absorbed by plants to make protein
-When animals eat plants the protein is transferred to animals
-When plants and animals die, and excretory nitrogenous substances are decomposed by decaying bacteria. It breaks them down to ammonia
-Nitrifying bacteria converts ammonium compounds
-Nitrifying bacteria changes nitrit to nitrate
-Denitrifying bacteria converts nitrates to nitrogen.
-Nitrates then are absorbed by plants to make protein
-When animals eat plants the protein is transferred to animals
-When plants and animals die, and excretory nitrogenous substances are decomposed by decaying bacteria. It breaks them down to ammonia
-Nitrifying bacteria converts ammonium compounds
-Nitrifying bacteria changes nitrit to nitrate
-Denitrifying bacteria converts nitrates to nitrogen.
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