Lesson 18 10/10/17 SWBAT answer an APES FRQ related to biogeochemical cycles Do Now: MC Questions.

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Lesson 18 10/10/17 SWBAT answer an APES FRQ related to biogeochemical cycles Do Now: MC Questions

Do Now Key A E B D

1. Biotic Nitrogen Fixation Nitrogen gas (N2) and H2 is converted into ammonia (NH3) Nitrogen fixing organisms: Cyanobacteria and bacteria that live in the roots of legumes (beans, peas) Bacteria Rhizobium participates in nitrogen fixation Nitrogen is fixed in cyanobacteria through their heterocysts

1. Abiotic Nitrogen Fixation Lightning and combustion convert N2 into NO3- (nitrate) Humans can fix nitrogen through technology that convert N2 into NO3- (nitrate) to be used as fertilizer

2. Assimilation Producers obtain fixed nitrogen in the form of ammonium (NH4+), ammonia (NH3) or nitrate (NO3-) and assimilate it (take it) into their tissues Consumers assimilate nitrogen by eating producers

3. Ammonification Producers and consumers die Nitrogen returned to soil Decomposers break down dead organisms into ammonium (NH4+)

4. Nitrification Nitrifying bacteria convert ammonium (NH4+) into nitrite (NO2-) and then into nitrate (NO3-) Nitrate is usable for producers Nitrate moves through soil with water by leaching Negative charge of nitrate (NO3-) does not bind easily to soil particles (also negatively charged)

5. Denitrification Leached nitrates settle in sediment Denitrifying bacteria convert nitrate (NO3-) into nitrous oxide (N2O) and nitrogen gas (N2) Nitrogen gas released back to atmosphere

Tips for mastering the nitrogen cycle Make flash cards! Nitrite (NO2-) is light because it has one less oxygen than nitrate (NO3-) Ammonium (NH4+) has one more letter and one more hydrogen than ammonia (NH3)

FRQ Practice Work silently and independently for 10 minutes on the FRQ You may use your notes as needed After 10 minutes you may work through FRQ with your group

Homework Complete FRQ and Reflection