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THE NITROGEN CYCLE

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NITROGEN

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NITROGEN QUICK FACTS We use nitrogen to build proteins We use it to build each piece of DNA 7 N 14.01 Its the #1 gas in the atmosphere 78% Nitrogen = building blocks

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Where do you find it? Air Dead Animals & Plants R.I.P. Animal R.I.P. Plant Live Animals Animal Waste Soil Live Plants

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Where else is it found? Oceans

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Where else is it found? Fertilizers

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Plants and animals CANNOT use N 2 to get their nitrogen! Nitrogen always comes in pairs when in the air we call this atmospheric nitrogen (N 2 ) N2N2 REJECTED

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Luckily there are some kinds of bacteria that can change the nitrogen in the air N2N2 Bacteria not to scale into forms that plants can use Accepted! Animals can then eat those plants so that we get our nitrogen as well! Usable Nitrogen

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Bacteria changing N 2 into a form that can be used by plants is called Nitrogen Fixation And any bacteria that does this we call Nitrogen Fixing Bacteria (Creative, I know)

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Nitrogen Fixing Bacteria Nitrogen fixing bacteria refers to any bacteria that combine nitrogen with oxygen or hydrogen to create useable nitrogen for plants or animals. Useable forms of nitrogen include Ammonia (NH4) Nitrates (NO3) Rhizobium Bacteria

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Nitrogen-Fixing Bacteria Nodules

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Bacteria not to scale Accepted! N2N2 Usable Nitrogen Review the animation

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Bacteria not to scale Accepted! N2N2 Usable Nitrogen Now review it in your notes

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Thats it, were done, RIGHT? WRONG This is a cycle, remember?

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THE NITROGEN CYCLE EPISODE II

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Bacteria not to scale Accepted! Lets review - see if you can tell me where Nitrogen Fixation is taking place in the process below Option A Option B Option C Option D N2N2 Usable Nitrogen

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R.I.P. Cow R.I.P. Plant As animal waste and dead organisms are broken down by decomposers, their nitrogen is released back into the soil So what next? Once the nitrogen goes into animals and plants how does it get out to complete the cycle? 1. Waste 2. Death

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Accepted! Two things can happen from there 1. It can be reabsorbed by plants 2. A second kind of bacteria can change the nitrogen back into N 2 N2N2

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The process where bacteria change usable nitrogen back into N 2 is called Denitrification And we call the bacteria that do this Denitrifying Bacteria

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R.I.P. Cow R.I.P. Plant Bacteria not to scale Accepted! N2N2 Usable Nitrogen We have a cycle N2N2

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Nitrogen Fixing Bacteria Root Absorption Consumption Death Waste Cycle within a cycle Decomposers Denitrifying Bacteria N2N2 N2N2 N2N2 Atmosphere Nitrogen Fixation Denitrification

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So how are humans affecting the Nitrogen Cycle? 1. Fertilizer Overload

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So how are humans affecting the Nitrogen Cycle? 1. Fertilizer Overload 2. Air Pollutants

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So how are humans affecting the Nitrogen Cycle? 1. Fertilizer Overload 2. Air Pollutants 3. Greenhouse Gases

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What else should I know about the nitrogen cycle? Lightning LIGHTNINGED! Legumes

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What else should I know about the nitrogen cycle? Lightning Legumes

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What else should I know about the nitrogen cycle? Lightning ITS OVER!

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Nitrogen Fixing Bacteria Root Absorption Consumption Death Waste Cycle within a cycle Decomposers Denitrifying Bacteria N2N2 N2N2 N2N2 Atmosphere Nitrogen Fixation Denitrification