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Nitrogen Cycle
Test Description: Identify the processes in the nitrogen cycle.
Instructions: Answer all questions to get your test result.
1) Which is the largest nitrogen sink?
A
biotic components
B
water systems
C
atmosphere
D
rocks
2) What do plants do with fixed nitrogen?
A
They can't use it.
B
They nitrify it.
C
They ammonify it.
D
They assimilate it.
3) Which is created during nitrogen fixation by biotic processes?
A
NO3-, nitrate
B
NH3, ammonia
C
NH4+, ammonium
D
N2, nitrogen
4) During nitrification, bacteria convert ________ into ________.
A
N2O N2 or nitrous oxide into nitrogen
B
NH4+ NO3- or ammonium into nitrates
C
N2 N2O or nitrogen into nitrous oxide
D
NO3- NH4+ or nitrates into ammonium
5) Which step is not performed by bacteria?
A
nitrogen fixation
B
assimilation
C
ammonification
D
denitrification
6) Which step returns nitrogen back to the atmosphere?
A
nitrogen fixation
B
denitrification
C
nitrification
D
ammonification
7) In the process of converting NH4+ to NO3-, the intermediate molecule is ____
A
nitrogen, N2
B
nitrous oxide, N2O
C
ammonia, NH3
D
nitrite, NO2-
8) Nitrogen makes up _______ of the atmosphere.
A
64%
B
23%
C
78%
D
45%
9) Nitrogen is considered a limiting nutrient because
A
It is easily leached out of the soil into the ground water which it pollutes.
B
it's so difficult to break the nitrogen triple bond and make it available for plants.
C
It stays suspended in the atmosphere and can't get to the roots.
D
Plants are mostly made of nitrogen and therefore need lots of it.
10) The sequence of the nitrogen cycle is _
A
nitrification, assimilation, fixation, denitrification, ammonification
B
fixation, ammonification, assimilation, denitrification, nitrification
C
fixation, assimilation, ammonification, nitrification, denitrification
D
assimilation, fixation, ammonification, nitrification, denitirification
11) Which molecule(s) is(are) created during denitrification?
A
ammonium
B
ammonia
C
nitrogen
D
nitrates
*select an answer for all questions
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