Nitrogen Cycle Quiz (WJEC Biology) 2.0 / 5 based on 1 rating ? BiologyBiological molecules, organic chemistry and biochemistryA2/A-levelWJEC Created by: KatyCreated on: 10-01-13 11:20 The nitrogen cycle is... The flow of organic and inorganic nitrogen within an ecosystem 1 of 12 What do living organisms need nitrogen for? To make amino acids, proteins and nucleic acid 2 of 12 How do plants obtain nitrogen? They take in nitrate ions in solution through their roots 3 of 12 What are the main processes of the nitrogen cycle? Putrefaction, Nitrification, Nitrogen Fixation, Denitrification 4 of 12 The decomposition of dead organisms is called Putrefaction 5 of 12 What bacteria are responsible for converting ammonium ions into nitrites? Nitrosomonas 6 of 12 Nitrobacter converts ___ into ___? Nitrites into Nitrates 7 of 12 Azotobacter is a nitrogen fixing bacteria which is....? Free living 8 of 12 An additional souce of nitrogen fixation is... Lightning 9 of 12 The relationship of Rhizobium bacteria and the roots of leguminous plants is an example of what? Mutualism 10 of 12 Denitrification is... The conversion of nitrates back to nitrogen 11 of 12 Denitrification is a particular problem in... Waterlogged soils with anaerobic conditions 12 of 12
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