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Nitrogen and Carbon Cycle

Total questions: 69

Worksheet time: 36mins

Name
Class
Date
1.

What converts nitrogen gas into a usable form for plants and animals?

a)

bacteria

b)

rain

c)

fungi

d)

car exhaust

2.

The process in which nitrogen circulates and is recycled is called

a)

The nitrogen cycle

b)

The carbon cycle

c)

The water cycle

d)

The phosphorus cycle

3.

Organisms that need nitrogen to survive.

a)

only plants

b)

only animals

c)

only bacteria

d)

all living things

4.

How is nitrogen "fixed" into a usable form for plants?

a)

Through action of bacteria only

b)

Through lightning only

c)

Through action of bacteria and lightning

d)

Through photosynthesis

5.

How do 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

6.

Gas that makes up 78% of our atmosphere.

a)

Oxygen

b)

Nitrogen

c)

Hydrogen

d)

Carbon Dioxide

7.

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

8.

What process occurs when dead plant and animal matter decomposes and nitrogen is released back into the atmosphere?

a)

Assimilation

b)

Fixation

c)

Ammonification

d)

Denitrification

9.

What is the formula for atmospheric nitrogen?

a)

N

b)

N2

c)

NH3

d)

NO3

10.

Plants and animals cannot use nitrogen directly from the air.

a)

True

b)

False

11.

According to this diagram, plants use nitrogen to make _________________________

a)

bacteria

b)

animals

c)

proteins

d)

decomposers

12.

According to this diagram, plants absorb

a)

nitrates

b)

nitrogen fixing bacteria

c)

animals

d)

decomposers

13.

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

14.

Bacteria fix nitrogen from the atmosphere into a form plants can use.

a)

True

b)

False

15.

Bacteria create a form of nitrogen that animals can use directly.

a)

True

b)

False

16.

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

17.

In the nitrogen cycle, what does label A in the diagram represent?

a)

Gas

b)

Clouds

c)

Carbon dioxide in the atmosphere

d)

Nitrogen in the atmosphere

18.

All plants have nitrogen fixing bacteria in their roots.

a)

True

b)

False

19.
How much of the atmosphere is composed of nitrogen gas?
a)
87%
b)
38%
c)
78%
d)
21%
20.
Organisms that break down dead plants & animals and release nitrogen back into atmosphere...
a)
bacteria
b)
plants
c)
animals
d)
producers
21.
Organisms that need nitrogen to survive
a)
only plants
b)
only animals
c)
only bacteria
d)
all living organisms
22.
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.
23.
Plants and animals cannot use nitrogen directly from the air.
a)
True
b)
False
24.
After plants and animals contain nitrogen, what puts it back into atmosphere and soil?
a)
decomposition
b)
precipitation
c)
condensation
d)
bacteria
25.
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
26.
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
27.
The process in which Nitrogen circulates and is recycled is called ____________
a)
The nitrogen cycle
b)
The water cycle
c)
The carbon cycle
d)
Nitrogen Fixation 
28.
_____ is the conversion of organic nitrogen into ammonia
a)
Nitrogen Fixation
b)
Ammonification
c)
Denitrification
d)
Assimilation 
29.
Nitrification happens in the ______
a)
Air 
b)
Soil 
c)
Ground Water 
d)
Plants 
30.
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
31.

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

32.
Which of the following add carbon dioxide to the atmosphere?
a)
volcanoes
b)
combustion of fossil fuels
c)
animal and plant respiration
d)
all of these
33.
Plants release water into the atmosphere by 
a)
photosynthesis
b)
transpiration
c)
perspiration
d)
respiration
34.
What is happening at 1?
a)
respiration: releasing CO2
b)
decomposing CO2 in the soil
c)
photosynthesis: absorbing CO2
d)
turning CO2 from the atmosphere into organic molecules
35.

features of environment that are alive or were once alive

a)

biotic

b)

abiotic

c)

inbiotic

d)

biography

36.
How much of the atmosphere is composed of nitrogen gas?
a)
87%
b)
38%
c)
78%
d)
21%
37.
oxygen is a gas produced by _ and used by  _ 
a)
plants and animals 
b)
photosynthesis and carbon dioxide 
c)
animals and plants 
d)
carbon dioxide and photosynthesis
38.
if there is a fire in a forest, there will be less _ in the environment?
a)
nitrogen
b)
oxygen
39.
All of the carbon in existence is continually recycled in the carbon cycle
a)
True
b)
False
40.
How is the burning of fossil fuels related to global warming?
a)
Magic
b)
Fuels are hot
c)
Greenhouse effect
d)
Photosynthesis
41.
Which of the following removes carbon from the atmosphere?
a)
Combustion
b)
Respiration
c)
Photosynthesis
d)
Death
42.
Which of the following is an example of a decomposer?
a)
Owl
b)
Fish
c)
Tree
d)
Mushroom
43.
Organisms that do not decompose can be buried and become what?
a)
water
b)
nutrients
c)
air
d)
fossil fuels
44.
Which process converts carbon in the form of sugar into carbon dioxide gas?
a)
Bioremediation
b)
Photosynthesis
c)
Respiration
d)
Transpiration
45.
If the plant population decreased, the amount of carbon would _________.
a)
Stay the same
b)
Increase
c)
Decrease
46.
carbon dioxide is a gas produced  by ________ and used by __________
a)
plants and animals 
b)
carbon and photosynthesis
c)
animals and plants 
d)
photosynthesis
47.

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

48.

Which is a true statement?

a)

Humans depend on oxygen, plants depend on carbon dioxide

b)

Plants produce carbon dioxide

c)

Humans depend on carbon dioxide, plants depend on oxygen

d)

Humans don't depend on plants for the air they need

49.

Plants use ____________ to make their own food

a)

Water

b)

Sunlight

c)

Carbon dioxide

d)

All of these

50.

Which gas do plants release, that humans depend on for survival?

a)

Water

b)

Carbon Dioxide

c)

Oxygen

d)

Sugar

51.

C6H12O6 is also known as glucose (sugar). Where is it found?

a)

Plants

b)

Animals

c)

Both plants and animals

d)

Neither plants or animals

52.

____________________ is a part of oceans, air, rocks, soil, and all living things.

a)

Nitrogen

b)

Water

c)

Carbon

d)

Silver

53.

Through the process of photosynthesis, plants pull CO2 from the air to make plant food for themselves.

a)

True

b)

False

54.

When animals eat plants, the carbon that the plant contains is absorbed by the animals.

a)

True

b)

False

55.

Plants use ____________________ to make their own food.

a)

Carbon Dioxide

b)

Oxygen

c)

Materials

d)

Gravity

56.

How do animals get carbon?

a)

By eating plants and or other animals.

b)

They absorb it from the atmosphere.

c)

From the ground

d)

They do not get carbon from anywhere.

57.

What are fossil fuels made from?

a)

Plants and animals that are buried underground for millions of years.

b)

They absorb it from the atmosphere.

c)

Water

d)

Wind

58.

When humans EXHALE, we release __________________.

a)

Oxygen

b)

Carbon Dioxide

c)

Nitrogen

d)

Water

59.

What is CO2?

a)

Carbon Monoxide

b)

Carbon Trioxide

c)

Carbon Dioxide

d)

Oxygen

60.

Respiration is a process where living things (animals) inhale ______________ and exhale _____________________.

a)

Oxygen, Nitrogen

b)

Carbon Dioxide, Oxygen

c)

CO2, O

d)

Oxygen, Carbon Dioxide

61.

Which of the following are fossil fuels?

a)

Coal, water, oil

b)

Oxygen, coal, oil

c)

Coal, Oil, Natural Gas

d)

None of the above

62.

Where can you find carbon?

a)

Only in Earth's atmosphere

b)

Inside all water molecules

c)

Inside the sun

d)

Inside every living thing on Earth

63.

How is the carbon cycle similar to the water cycle?

a)

Both involve liquid substances falling to the Earth from the atmosphere?

b)

Neither process works at low temperature.

c)

Both involve the transfer of substances between animals, plants, and the Earth.

d)

Both involve the transfer of substances between the earth and outer space.

64.

What organisms in the ocean absorb the most carbon dioxide?

a)

Algae and marine plants

b)

Ocean mammals, like whales and dolphins

c)

Fish

d)

Coral

65.

What is a carbon sink?

a)

Something that adds to the atmosphere.

b)

Something that removes carbon from the atmosphere.

c)

Something that adds carbon to the earth's crust.

d)

Something that removes carbon from the earth's crust.

66.

Which of these historical events led to a major imbalance in the carbon cycle?

a)

The American Civil War

b)

The American Revolution

c)

The Industrial Revolution

d)

The French Revolution

67.

How does carbon become locked inside the earth?

a)

Tree roots expel carbon into the soil as they grow.

b)

Humans use machines to pump carbon dioxide into large underground rocks.

c)

Rocks become richer in carbon as time goes by.

d)

The carbon-rich bodies of plants and animals decay into the earth after they die.

68.

How do carbon emissions lead to global warming?

a)

By trapping the sun's heat in the atmosphere.

b)

By causing very hot volcanic eruptions.

c)

Rocks become richer in carbon as time goes by.

d)

By increasing the amount of carbon in the earth's crust

69.

Which of these is a factual statement about carbon?

a)

Humans use far too much carbon-based fuel

b)

Carbon is the fourth-most abundant element in the universe

c)

There is no relationship between carbon emissions and global climate change.

d)

Burning rainforests helps restore equilibrium to the carbon cycle.

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