Nitrogen Cycle
Name _______________________
Period ____ Date _____________
The element _________________ also has the ability to _______________ globally,
because of its presence in the _________________, ______________ and _______.
Nitrogen in the atmosphere is only found in the form _________.
Only _____________________________________ can take in nitrogen in this form.
Therefore, ____________________________________ in the soil take on the task.
The bacteria come in two types: __________ bacteria and ______________ bacteria.
______________ bacteria survive ______________________________ in the soil.
Free _____________ carry out the chemical reaction that __________________ to
_________________(NH4+). This is called ________________________________.
Ammonium and __________________(NO3-), another form of nitrogen, can be used by
____________________ and are found in ___________________________.
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Nitrifying ___________________in the soil _____________________________ to
____________________________________. This is called nitrification.
Finally we get to ____________________________ bacteria.
These bacteria supply ___________________, or _____________________ plants,
with nitrogen that they cannot receive on their own.
This is a ____________________________ relationship, because the bacteria do not
benefit, but the legumes could not possibly survive without them.
Another process in the Nitrogen Cycle is the _______________________________.
Water, carbon, and _____________________ are __________________________
into the atmosphere during __________________________.
Abiotic reservoirs: ____________________, ______________________
Biotic reservoirs: ________________, _________________, _________________
Nitrogen is released to the abiotic parts of the biosphere from the processes of death
and _____.
a.
decay by bacteria
c.
runoff
b.
infiltration of groundwater
d.
lightning in storm clouds
The nitrogen cycle in a fish tank…
The fish urinate producing ammonia
Nitrosomonas bacteria convert ammonia to
nitrites
Nitrobacter bacteria convert nitrites to
nitrates
Nitrates are less harmful than nitrites
Plants use the nitrates and the rest can be
removed with water changes
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