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Nitrogen and Carbon Cycles

Total questions: 43

Worksheet time: 22mins

Name
Class
Date
1.
When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.
a)
Water
b)
Atmosphere
c)
Sun
d)
Air
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.

Which of the following add carbon dioxide to the atmosphere?

a)

volcanoes

b)

combustion of fossil fuels

c)

animal respiration

d)

all of these

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.
TRUE or FALSE?
All of the carbon in existence is continually recycled in the carbon cycle.
a)
True
b)
False
6.
Organisms that do not decompose can be buried and become what?
a)
water
b)
nutrients
c)
air
d)
fossil fuels
7.
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
8.

Which describes the relationship between plants and animals in the carbon cycle?

a)

Plants produce and release oxygen that animals need

b)

Plants produce and release carbon dioxide that animals need

c)

Animals produce and release oxygen that plants need

d)

Animals produce oxygen that plants turn into carbon dioxide

9.
How do  animals get nitrogen?
a)
the atmosphere 
b)
eating other organisms
c)
bacteria
d)
lightning 
10.
Building proteins and DNA is the reason organisms need what substance?
a)
Water
b)
Carbon
c)
Nitrogen
d)
Calcium
11.
How do living organisms return carbon to the atmosphere in the carbon cycle?
a)
respiration and photosynthesis
b)
 decomposition and respiration
12.
In the carbon cycle, producers take in the gas __
a)
carbon dioxide
b)
oxygen
c)
nitrogen
d)
carbon monoxide
13.
In what process is Carbon transformed into chemical energy?
a)
Photosynthesis
b)
Respiration
c)
Primary Production
d)
Secondary Production
14.
Organisms that need nitrogen to survive
a)
only plants
b)
only animals
c)
only bacteria
d)
all living organisms
15.
Organisms that play a role in the nitrogen cycle
a)
only plants
b)
only animals
c)
only bacteria
d)
plants, animals, & bacteria
16.
Plants and animals need nitrogen to make __________.
a)
Protein
b)
Carbohydrates
c)
Lipids
d)
Nucleic Acids
17.
When nitrogen gas is turned in to a form that plants and animals can use is called 
a)
Combustion
b)
Photosynthesis
c)
Decomposition
d)
Nitrogen Fixation
18.
How do  animals get nitrogen?
a)
the atmosphere 
b)
eating other organisms
c)
bacteria
d)
lightning 
19.

The process of converting nitrogen into ammonium by bacteria.

a)

ammonification

b)

denitrification

c)

nitrofication

d)

detrivore

20.

The continuous movement of carbon among the abiotic environment and living things.

a)

nutrient cycle

b)

carbon cycle

c)

nitrogen cycle

d)

water cycle

21.

The reduction of oxidized forms of nitrogen (nitrates), ultimately resulting in molecular nitrogen.

a)

ammonification

b)

denitrification

c)

nitrification

d)

nitrogen fixation

22.

A family of plants including beans, alfalfa, and peas, most of which harbor symbiotic, nitrogen-fixing bacteria in nodules in their roots.

a)

producers

b)

legumes

c)

prokaryotes

d)

tubers

23.
How much of the atmosphere is composed of nitrogen gas?
a)
87%
b)
38%
c)
78%
d)
21%
24.
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
25.

Plants and animals cannot use nitrogen directly from the air.

a)

True

b)

False

26.

What is denitrification?

a)

Conversation of nitrite back to nitrogen gas

b)

Conversation of ammonia back to nitrogen gas

27.

Which of the following removes carbon from the atmosphere?

a)

Combustion

b)

Respiration

c)

Photosynthesis

d)

Death

28.

What are two ways that CO2 is released into the atmosphere?

a)

Vacuuming and dusting.

b)

Combustion and decomposition.

c)

Swimming and decomposition.

d)

None of the above.

29.

A correct path that nitrogen could take would be

a)

air -> animals -> plants -> bacteria

b)

animals -> air -> bacteria -> plants

c)

bacteria -> air -> plants -> animals

d)

air -> bacteria -> plants -> animals

30.
Nitrogen fixing bacteria, lives in nodules on the root of a plant called
a)
Broccoli
b)
Legumes
c)
Beats
d)
Carrots
31.

___________ is absorbed by _____________ from the air as CO2.

a)

Nitrogen, plants

b)

Nitrogen, living things

c)

Carbon, plants

d)

Carbon, living things

32.

Carbon is dissolved in the _____________ and found in ocean sediments.

a)

ocean

b)

river

c)

lake

d)

stream

33.

Carbon is stored in ___________ _________ like coal, oil, and natural gas.

a)

nucleic acids

b)

hard rocks

c)

fossil fuels

d)

large oceans

34.

______________ converts N2 gas in the air into NH3, then the

rain carries this nitrogen down to the soil!

a)

Thunder

b)

Lightning

c)

Rain

d)

Floods

35.

__________ ____________ occur when runoff carries fertilizers into waterways.

a)

Algal blooms

b)

Fertilizer blooms

c)

Green stuff

d)

Mossy plants

36.
A particular golf course is using large amounts of nitrogen fertilizer. What process could move this nitrogen into a local stream?
a)
volatilization
b)
nitrogen fixation
c)
runoff
d)
ammonification
37.

What is the largest reservoir for carbon?

a)

the ocean

b)

rocks and minerals

c)

the atmosphere

d)

glaciers

38.

What is the largest reservoir for nitrogen?

a)

the ocean

b)

rocks and minerals

c)

the atmosphere

d)

bacteria

39.

The rapid growth of a population of algae in either a freshwater or saltwater environment is call a(n)

a)

red tide

b)

algal bloom

c)

protozoan

40.

In general, algal blooms occur when

a)

toxins accumulate in shellfish.

b)

nutrients decrease in the water.

c)

nutrients increase in the water.

41.

The rapid growth of algae, called an algal bloom, can lead to the formation of dead zones that cannot sustain aquatic life. This is mainly because the algal bloom lowers the amount of –

a)

chemical pollutants

b)

dissolved oxygen

c)

freshwater runoff

42.
What does not produce carbon dioxide?
a)
Photosynthesis
b)
Burning Fossil Fuels
c)
Animal respiration
d)
Plants decaying
43.
Combustion is another word for __________.
a)
Transportation
b)
Respiration
c)
Fossil Fuels
d)
Burning

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