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The Nitrogen Cycle Nitrogen is an essential part of proteins and DNA. Like carbon, nitrogen must be recycled continuously. Go to the following website or search on your own to learn how this happens: http://www.windows2universe.org/earth/Life/nitrogen_cycle.html 1. Where is most nitrogen in the biosphere located? 2. This nitrogen is not in a useable form. Plants and animals cannot simply absorb nitrogen from the atmosphere. Therefore, it must be _____________________ , which means ________________________________. 3. There are two ways that nitrogen can be removed from the atmosphere: a) b) 4. What happens to nitrogen inside of a plant? 5. How does the nitrogen get to carnivores? 6. What happens to the nitrogen when organisms die? 7. What is the name of the process which returns nitrogen to the atmosphere? 8. Go to the following site and place a number next to the steps involved in the nitrogen cycle: http://ridge.icu.ac.jp/gen-ed/ecosystemjpgs/nitrogen-cycle.jpg o nitrogen-fixation – (nitrogen in atmosphere converted to ammonia by lightning or nitrogen-fixing bacteria) _____ o nitrification (ammonia converted to nitrates by nitrifying bacteria)_______ o assimilation (plants absorb nitrates, incorporate into proteins. Nitrogen in now in the food chain) _____ o ammonification (dead plants/animals converted to ammonia by ammonifying bacteria) _____ o denitrification (some nitrates are returned to atmosphere by denitrifying bacteria) _______ 9. What type of organism do you notice is essential in nearly every stop of the nitrogen cycle? 10.Where do plants get their nitrogen from? Go to the following link and read the story. http://www.windows2universe.org/earth/climate/nitrogen_changes.html 11. What are the ways that humans can effect the nitrogen cycle? What could we do to lessen our impact. Websites http://nortonbooks.com/college/biology/animations/ch38a02.html http://www.physicalgeography.net/fundamentals/9s.html http://www.neuse.ncsu.edu/nitrogen/ Questions How is nitrogen important in our lives? Why are nitrogen-fixing bacteria contributions to the nitrogen cycle so important? Nitrogen gas makes up ____________________________ of the air we breathe. Nitrogen __________________________ converts ____________________________ to _____________________________ for organisms to use. Another useable form of nitrogen, NH4 + can be converted to _________________________ by ___________________________ for organisms to use. Plants use both __________________________ and ________________________ to incorporate nitrogen into DNA, protein, and other molecules. Explain how animals get their needed amounts of nitrogen. Explain how nitrogen cycles through the land and ocean ecosystems. How does the human impact of fertilizers impact the nitrogen cycle?