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WorksheetsNitrogen Cycle
Total questions: 40
Worksheet time: 26mins
Name
Class
Date
1.
Organisms require nitrogen to make which of the following? (Choose the answer in which all are true)
a)
glucose and starch
b)
lipids and nucleic acids
c)
proteins, chlorophyll, and nucleic acids
d)
carbohydrates and proteins
2.
How much of the atmosphere is composed of nitrogen gas?
a)
87%
b)
38%
c)
78%
d)
21%
3.
How do plants get the nitrogen they need?
a)
from the air
b)
from the soil or water in which they live
c)
from the Sun
4.
Organisms that break down dead plants & animals and release nitrogen back into atmosphere...
a)
bacteria
b)
plants
c)
animals
d)
producers
5.
This gas makes up 21% of the atmosphere
a)
ozone
b)
oxygen
c)
nitrogen
d)
water vapor
6.
Nitrogen fixation processes nitrogen from which of the following sources?
a)
lightning
b)
fertilizers
c)
dead plants
d)
atmosphere
7.
A particular golf course is using large amounts of nitrogen fertilizer. What process is most likely to move this nitrogen into a local stream?
a)
volatilization
b)
nitrogen fixation
c)
runoff
d)
ammonification
8.
Organisms that convert fixed nitrogen back into nitrogen gas and release nitrogen gas back into atmosphere...
a)
denitrifying bacteria
b)
fungi
c)
maggots
d)
all of the above
9.
Organisms that need nitrogen to survive
a)
only plants
b)
only animals
c)
only bacteria
d)
all living organisms
10.
Bacteria fix nitrogen on plant roots. Plant roots provide sugar to bacteria. This is an example of
a)
mutualism
b)
parasitism
c)
commensalism
d)
competition
11.
Because nitrogen is required for growth, it is considered an essential...
a)
nitrate
b)
nutrient
c)
organism
d)
cell
12.
Plants and animals cannot use nitrogen directly from the air.
a)
True
b)
False
13.
The process by which nitrogen gas is turned into a form that plants and animals can use is called
a)
Combustion
b)
Photosynthesis
c)
Decomposition
d)
Nitrogen Fixation
14.
All plants have nitrogen fixing nodules on their roots.
a)
True
b)
False
15.
The process where excess nutrients enter body of water causing overgrowth of aquatic plants and algae...
a)
Eutrophication
b)
Acid Precipitation
c)
Nitrogen Fixation
d)
Decomposition
16.
What is an example of a legume?
a)
strawberries
b)
carrots
c)
peanuts
d)
corn
17.
If the atmosphere is 78% N2, why can't we just get our nitrogen by breathing?
a)
We have no mechanism to break the triple bond of nitrogen between the atoms.
b)
Our lungs would be damaged by the N2.
c)
We need Oxygen for cellular respiration.
d)
The legumes take it up first.
18.
How does N2 get into soil?
a)
N2 diffuses into the pore spaces between the soil particles
b)
Legumes pull it in.
c)
gravity. It's not just a good idea, it's the Law.
d)
1st Law of Thermodynamics
19.
Rhizobium bacteria perform nitrogen fixation which converts
a)
N2 into NH4+
b)
NH4+ into N2
c)
NH4+ into NO3
d)
NO3 into proteins
20.
Nitrifying bacteria convert
a)
NH4+ into NO2 then NO3
b)
NH4+ into N2
c)
NO3 into NO2
d)
Nothing into nothing
21.
Wastes such as dead leaves, scat (poop) and dead organisms that contain nitrogen are broken down by decomposers into
a)
NH4+
b)
N2
c)
NO3
d)
NO2
22.
Denitrifying bacteria convert
a)
NH4+ to N2
b)
NH4+ to NO3
c)
N2 to NH4+
d)
legumes into charro beans. Yum.
23.
Which of the following are nitrogen "fixers"
a)
rabbits
b)
bacteria and lightning
c)
decaying matter
d)
ammonifiers
24.
During _________, plants absorb nitrogen.
a)
nitrification
b)
dentrification
c)
assimilation
d)
ammonification
25.
Ammonia is converted to nitrite then nitrate in a process known as...?
a)
assimilation
b)
denitrifcation
c)
nitrification
d)
assimilation
26.
The nitrogen in the atmosphere can be readily absorbed by plants.
a)
True
b)
False
27.
What is the process of combining nitrogen gas with hydrogen to make nitrogen into usable compounds?
a)
nitrogen composition
b)
ammonia
c)
nitrogen fixation
d)
denitrification
28.
N03 is also known as
a)
ammonia
b)
nitrite
c)
nitrogen
d)
nitrate
29.
Based on this diagram, which of the following can you infer is the chemical formula for gaseous nitrogen?
a)
N
b)
N2
c)
N3
d)
N4
30.
Which of the following is a Nitrite?
a)
NO3-
b)
NO2-
c)
N2
d)
NH3
31.
Which of the following is a atmospheric nitrogen?
a)
NO3-
b)
NO2-
c)
N2
d)
NH3
32.
Which of the following is ammonia?
a)
NO3-
b)
NO2-
c)
N2
d)
NH3
33.
Fertilizer factories take _____ and chemically convert it to _____
a)
N2 :: NH4+
b)
NO2 :: NH4+
c)
N2 :: NO3-
d)
NO2 :: NO3-
34.
The ammonium ion (NH4+) is broken down by nitrite bacteria to (NO2-) and this is broken down by different bacteria to
a)
N2
b)
NH3
c)
NO3-
d)
NH4+
35.
What process is shown at # 6?
a)
dentirification
b)
ammonification
c)
assimilation
d)
fixation
36.
Nitrate levels often build up in an aquarium over time. What is a way to lower the nitrate level in an aquarium?
a)
add fish
b)
add snails
c)
add plants
d)
remove plants
37.
When fertilizers run off into rivers the result causes
a)
plants to die
b)
animals to grow larger
c)
algae to grow
d)
the sky to fall
38.
Animals obtain nitrogen by ......
a)
dying
b)
breathing
c)
eating
d)
decomposition
39.
The largest storage place for nitrogen is in .....
a)
animals
b)
the atmosphere
c)
the soil
d)
decomposers
40.
Plants obtain nitrogen by.....
a)
photosynthesis
b)
absorption through roots
c)
respiration
d)
transpiration
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