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WorksheetsThe Nitrogen Cycle + The Phosphorus Cycle
Total questions: 14
Worksheet time: 7mins
Name
Class
Date
1.
How animals get the nitrogen they need
a)
from the air they breathe
b)
from the water they drink
c)
from the food they eat
d)
from the Sun
2.
Organisms that play a role in the nitrogen cycle
a)
only plants
b)
only animals
c)
only bacteria
d)
plants, animals, & bacteria
3.
All plants have nitrogen fixing nodules on their roots.
a)
True
b)
False
4.
Organism that breaks down dead plants & animals and releases nitrogen back into atmosphere
a)
bacteria
b)
plants
c)
animals
d)
producers
5.
How plants get the nitrogen they need
a)
from the air
b)
from the soil or water in which they live
c)
from the Sun
d)
from broken down rocks
6.
What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?
a)
nitrogen composition
b)
ammonia
c)
nitrogen fixation
d)
denitrification
7.
Plants and animals cannot use nitrogen directly from the air.
a)
True
b)
False
8.
What happens when organisms die and decay?
a)
Their bodies are lifted up
b)
Their nitrogen returns to the soil
c)
they keep their nitrogen
d)
They stay on earth forever
10.
Nitrification happens in the ______
a)
Air
b)
Soil
c)
Ground Water
d)
Plants
10.
Nitrification happens in the ______
a)
Air
b)
Soil
c)
Ground Water
d)
Plants
11.
Phosphorous is passed from plants to ____ who eat them
a)
plants
b)
animals
c)
scavengers
12.
_____ brings phosphorous into our waterways. .
a)
precipitation
b)
runoff
c)
transpiration
d)
condensation
13.
Which of the following statements is true of the phosphorus cycle?
a)
Phosphorus enters the atmosphere as phosphates.
b)
The phosphorus cycle utilizes the processes of erosion, and weathering.
c)
Phosphates are used in carbohydrate and glucose storage.
d)
The phosphorus cycle utilizes bacteria to breakdown phosphates and make them available for plants.
14.
What role do decomposers play in the phosphorous cycle?
a)
absorb phosphorous
b)
release phosphorous into atmosphere
c)
return phosphorous into the soil
d)
combustion
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