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APES test 1

QuestionAnswer
Nitrogen Fixation The process where atmospheric nitrogen (N2) is “fixed”, or combined with hydrogen, to form ammonia which can be taken up by plants. (Turns into a usable form)
Ammonification Bacteria or other types of decomposing organisms, break down nitrogen-containing chemicals from dead organic matter, into simple substances like ammonia (NH3).
Nitrification Other types of bacteria turn ammonium (NH4+) into nitrite ions (NO3-) and then into nitrate ions (NO3-), which is the version of MOST easily taken up by plants.
Assimilation Plants take nitrates up from the soil and use them to build tissues
Denitrification A third kind of bacteria converts nitrates in the soil back into atmospheric nitrogen, completing the cycle.
Created by: amybui
 

 



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