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WorksheetsNutrient Cycles
Total questions: 20
Worksheet time: 9mins
Name
Class
Date
1.
What are the four most important materials needed by living organisms?
a)
water, carbon, oxygen, nitrogen
b)
water, food, oxygen, carbon
c)
water, carbon, nitrogen, phosphorous
d)
water, carbon, food, phosphorous
2.
An underground layer of rocks or sand that can hold groundwater.
a)
watershed
b)
levee
c)
aquifer
d)
erosion
3.
An area or ridge of land that separates waters flowing to different rivers, basins, or seas.
a)
watershed
b)
levee
c)
aquifer
d)
erosion
4.
How much of the Earth's water is stored in the oceans?
a)
50%
b)
67%
c)
97%
d)
85%
5.
This is essential to living organisms, it is found in nucleic acid and amino acids.
a)
Nitrogen
b)
Carbon
c)
Water
d)
Phosphorous
6.
This is part of nucleic acids, ATP, and helps form animals' bones and teeth.
a)
Nitrogen
b)
Carbon
c)
Water
d)
Phosphorous
7.
The conversion of ammonium to nitrate is called what?
a)
nitrification
b)
renitrification
c)
denitrification
d)
unnitrification
8.
The conversion of nitrate to nitrogen gas is called what?
a)
nitrification
b)
renitrification
c)
denitrification
d)
unnitrification
9.
What is it called when water vapor cools and changes into a liquid?
a)
condensation
b)
respiration
c)
precipitation
d)
evaporation
10.
Where would you find most of the Earth's phosphorous?
a)
In the atmosphere
b)
Underwater
c)
on the Earth's surface
d)
Underground
11.
Which of the following is NOT a stage of the nitrogen cycle?
a)
organisms breathe in nitrogen gas
b)
organisms release nitrogen compounds via waste or decomposition
c)
bacteria convert unusable nitrogen to usable nitrogen
d)
plants absorb nitrogen compounds from the soil
12.
The three steps of the water cycle include:
a)
condensation, precipitation, filtration
b)
filtration, irrigation, evaporation
c)
precipitation, condensation, evaporation
d)
precipitation, filtration, evaporation
13.
Which of the following is NOT part of the carbon cycle?
a)
condensation
b)
photosynthesis
c)
combustion
d)
respiration
14.
Which of these is the greatest cause of harmful levels of carbon in the atmosphere?
a)
respiration
b)
combustion
c)
photosynthesis
d)
decomposition
15.
Which of these steps is part of the nitrogen cycle AND the phosphorous cycle?
a)
it starts off inside underwater rocks and dirt
b)
bacteria convert it into organic compounds
c)
animals leaving waste and death and decay release it back into the soil
d)
rain water and ocean waves break off pieces, putting it back into the ecosystem
16.
Which of these is in both the carbon cycle AND the phosphorous cycle?
a)
erosion
b)
respiration
c)
photosynthesis
d)
combustion
17.
Which type of bacteria would transform nitrate into nitrogen gas?
a)
nitrogen-fixing
b)
denitrifying
c)
nitrifying
d)
nitrogen-defixing
18.
Bacteria that cause nitrification in the soil cause nitrogen to change from _________ to _________.
a)
nitrogen gas; ammonia
b)
nitrogen gas; organic nitrogen
c)
ammonia; nitrate
d)
nitrate; ammonia
19.
Which of these is NOT a step of the carbon cycle?
a)
erosion
b)
respiration
c)
nitrification
d)
photosynthesis
20.
Which of these is a step in the carbon cycle, the nitrogen cycle, and the phosphorous cycle?
a)
condensation
b)
decomposition
c)
respiration
d)
photosynthesis
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