Froggy Jumps Nitrogen Cycle QuestOnline version Test your knowledge on nitrogen cycling. by 55%% 1 What is the primary purpose of the nitrogen cycle? a Recycle nitrogen into usable forms for life b Create atmospheric nitrogen c Produce nitrogen-rich fertilizers 2 Which process converts atmospheric N2 to ammonia? a Nitrification b Nitrogen fixation c Denitrification 3 Which organism group carries out nitrogen fixation in roots? a Rhizobium bacteria b Nitrosomonas bacteria c Fungi 4 What is produced during nitrification? a Organic nitrogen from soil b Nitrogen gas from ammonia c Nitrates from ammonia 5 What do plants absorb to build proteins and DNA? a Nitrates b Ammonia gas c Nitrogen gas 6 Which process returns nitrogen to the atmosphere? a Denitrification b Assimilation c Ammonification 7 What happens during ammonification? a Lightning converts nitrogen gas to nitrates b Decomposers convert organic nitrogen to ammonia c Plants convert nitrates to proteins 8 Where is most atmospheric nitrogen stored? a In plant tissues b In soils as nitrates c In the air (N2) 9 Name a real-life example of nitrogen fixation usage. a Legumes with nitrogen-fixing bacteria b Burning fossil fuels c Fish farming 10 Why is the nitrogen cycle important for ecosystems? a Prevents all pollution b Keeps oxygen levels high c Keeps nitrogen available for life and soil health 11 Which process converts atmospheric N2 into ammonia by bacteria? a Denitrification b Nitrogen fixation c Nitrification 12 Which process converts ammonia to nitrites and then nitrates? a Nitrification b Assimilation c Ammonification 13 What do plants absorb from soil to synthesize proteins? a Nitrates b Atmospheric nitrogen c Ammonia 14 Decomposers return which compound to the soil from dead matter? a Nitrogen gas b Ammonia c Nitrates 15 Which bacteria convert nitrates back into nitrogen gas? a Denitrifying bacteria b Nitrifying bacteria c Nitrogen-fixing bacteria 16 What is the major atmospheric nitrogen reservoir? a Ammonia b Nitrates c Nitrogen gas (N2) 17 What is the role of nitrogen-fixing plants like beans in the cycle? a They add nitrogen to the soil b They oxidize nitrates c They release oxygen 18 Which human activity disrupts the nitrogen cycle? a Photosynthesis b Increased rainfall c Application of synthetic fertilizers 19 During assimilation, what do plants do with nitrates? a Convert them to nitrogen gas b Use them to build organic molecules c Store as nitrate ions only 20 Why is the nitrogen cycle essential? a Regulates tides b Produces oxygen c Supports life and soil fertility
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