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Carbon Cycle and Nitrogen Cycle

Total questions: 35

Worksheet time: 26mins

Name
Class
Date
1.
During photosynthesis, carbon is moved from which reservoir to which reservoir?
a)
From the atmosphere to the terrestrial biosphere.
b)
From the troposphere to the terrestrial biosphere.
c)
From the lithosphere to the terrestrial biosphere.
d)
From the hydrosphere to the terrestrial biosphere
2.

How does carbon in a grass plant get into a lion?

a)

The lion eats an antelope that ate the grass

b)

Carbon from grass doesn't end up in a lion.

c)

The lion absorbs the carbon given off by transpiration

d)

The lion breathes in carbon given out by the plant

3.
Nitrogen fixing bacteria, lives in nodules on the root of a plant called
a)
Broccoli
b)
Legumes
c)
Beats
d)
Carrots
4.
How nitrogen is "fixed" into useable form for plants
a)
only through action of bacteria
b)
only through lightning
c)
through action of bacteria & lightning
d)
through photosynthesis
5.
Organisms that break down dead plants & animals and release nitrogen back into atmosphere...
a)
bacteria
b)
plants
c)
animals
d)
producers
6.
Organisms that do not decompose can be buried and become what?
a)
water
b)
nutrients
c)
air
d)
fossil fuels
7.
Carbon can be found in...
a)
The atmosphere
b)
Soil
c)
Fossil fuels
d)
All of the above
8.

What is the role of denitrifying bacteria

a)

change nitrate back into nitrogen gas

b)

change nitrogen gas into nitrate

c)

absorb carbon dioxide in the soil

d)

release oxygen gas into the atmosphere

9.

What process is the letter A demonstrating?

a)

Respiration

b)

Combustion

c)

Decomposition

d)

Photosynthesis

10.

What process is demonstrated by the letter B

a)

Photosynthesis

b)

Combustion

c)

Respiration

d)

Decomposition

11.

Nitrifying bacteria _______ nitrogen from the atmosphere. Denitrifying bacteria______nitrogen into the atmosphere.

a)

Remove, Add

b)

Add, Remove

c)

Remove, Remove

d)

Add, Add

12.

After Nitrifying bacteria ‘Fix” nitrogen and add it to the soil it can be used by

a)

Plants

b)

Water

c)

the atmosphere

d)

Lightning

13.

TRUE or FALSE: When an animal dies nitrogen and carbon are released into the atmosphere

a)

True

b)

False

14.

Which of the following add carbon back into the atmosphere? Check all that apply

a)

Photosynthesis

b)

Decomposition

c)

Burning fossil fuels

d)

Animal and plant respiration

15.

A correct path that nitrogen could take would be _____

a)

air -> animals->plants->bacteria

b)

animals->air->bacteria->plants

c)

air -> bacteria ->plants -> animals

d)

bacteria ->air -> animals->plants

16.

Dead plants, animals, and animal waste are converted to ammonium by _____________________

a)

plant roots

b)

lightning

c)

bacteria and fungi decomposers

d)

denitrifying bacteria

17.

Gas that makes up 78% of our atmosphere.

a)

Oxygen

b)

Nitrogen

c)

Hydrogen

d)

Carbon Dioxide

18.

What do free living bacteria in the soil do?

a)

Make clouds

b)

Turn atmospheric nitrogen into nitrates

c)

Make carbon dioxide for plants to go through photosynthesis

d)

Help plants take in water

19.

Which of these nitrogen molecules would be present in the atmosphere?

a)

NH3

b)

NH4+

c)

NO3-

d)

N2

20.
Carbon enters the living world through the process of _____.
a)
photosynthesis
b)
respiration
c)
combustion
d)
decomposition
21.

________________________ is part of the air, rocks, soil, and all living things.

a)

Nitrogen

b)

Carbon

c)

Water

d)

Silver

22.

When humans EXHALE, we release ____________________.

a)

Oxygen

b)

Nitrogen

c)

Water

d)

Carbon Dioxide

23.

Carbon moves from fossil fuels to the atmosphere when fuels are burned.

a)

True

b)

False

24.
TRUE or FALSE?
All of the carbon in existence is continually recycled in the carbon cycle.
a)
True
b)
False
25.
Which of the following removes carbon from the atmosphere?
a)
Combustion
b)
Respiration
c)
Photosynthesis
d)
Death
26.
Which one of these does not add CO2 to the atmosphere?
a)
cooking with gas
b)
planting trees
c)
burning wood
d)
riding in a bus
27.

What is the process of combining nitrogen gas with other elements to make nitrogen into usable compounds?

a)

nitrogen composition

b)

nitrogen fixation

c)

ammonia

d)

denitrification

28.
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
29.
The diagram shows the flow of organic molecules through an ecosystem. What two processes are identified by the labels X and Y?
a)
X : Respiration
Y : Predation
b)
X : Adaptation
Y : Decomposition
c)
X : Fermentation
Y : Nitrogen Fixation
d)
X : Decomposition
Y : Respiration
30.
What process occurs when coal (fossil fuel) is used for energy?
a)
Decomposition
b)
Combustion
c)
Pressurization 
d)
Respiration 
31.
Using fossil fuels is a safe for the environment. 
a)
True
b)
False
32.
What is the role of decomposers in an Ecosystem? 
a)
They recycle matter and nutrients to form fossil fuels
b)
They are burn and release as carbon dioxide
c)
Decomposers are responsible to turn oxygen into carbon dioxide
d)
They recycle energy back to the sun
33.
How do  animals get nitrogen?
a)
the atmosphere 
b)
eating other organisms
c)
bacteria
d)
lightning 
34.
If the plant population decreased, the amount of carbon would _________.
a)
Stay the same
b)
Increase
c)
Decrease
35.

Which nitrogen cycle process is occurring when bacteria convert ammonium to nitrite and then into nitrate?

a)

nitrogen fixation

b)

nitrification

c)

denitrification

d)

ammonification

e)

assimilation

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