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Nitrogen Cycle Worksheet Name: ______________________ Intro: Living organisms are made of atoms – mostly Carbon (C), Hydrogen (H), Oxygen (O), Phosphorus (P), Sulfur (S) and Nitrogen (N). Today we will learn all about the cycling of Nitrogen in ecosystem. Where can you find Nitrogen? Nitrogen can exists as either solid, liquid or gas. In the atmosphere nitrogen gas (N2) makes up 78% of the atmosphere. However, nitrogen must be converted or FIXED by bacteria before it can be used by others. Task #1: Go to our class’ wikispaces and look at today’s agenda. Visit the 1st website noted there to get an overview of the nitrogen cycle. Then visit the 2nd website to get detailed information on the various steps of Nitrogen Cycle to complete this worksheet. http://www.teachersdomain.org/asset/lsps07_int_nitrogen/ Press the “play” button to start and pause the animation. Roll over your mouse to various objects to get detailed explanations for each object. Nitrogen fixation: Nitrogen fixation occurs when _________________ converts N2 gas into _________________________ that living things can take up. Nitrogen-fixing bacteria, such as the ones found in roots of legumes (ex: soybean plants) supply nitrogen to the plant. In exchange, the bacteria receive _______________________________________ Ammonification: In this step, bacteria in soil or fungi will convert nitrogen into _____________________________ Nitrification: A 2-step process: 1) Soil bacteria converts _______________________ into ___________________ 2) Soil bacteria then convert nitrite ions into _____________________________ Denitrification: In this process __________________________ are converted to _________________ gas, which are then released to the atmosphere. Assimilation: This occurs when ________________________________________________________________________ Task #2: From what you have learned, draw your own Nitrogen Cycle diagram that shows all of the 5 steps involved.