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carbon cycle

Total questions: 65

Worksheet time: 35mins

Name
Class
Date
1.
What does NOT produce carbon dioxide?
a)
Photosynthesis
b)
Burning Fossil Fuels
c)
Animal respiration
d)
Plants decaying
2.
Combustion is another word for __________.
a)
Transportation
b)
Respiration
c)
Fossil Fuels
d)
Burning
3.
TRUE or FALSE?
All of the carbon in existence is continually recycled in the carbon cycle.
a)
True
b)
False
4.
Organisms that do not decompose can be buried and become what?
a)
water
b)
nutrients
c)
air
d)
fossil fuels
5.
Carbon can be found in...
a)
The atmosphere
b)
Soil
c)
Fossil fuels
d)
All of the above
6.
Which of the following removes carbon from the atmosphere?
a)
Combustion
b)
Respiration
c)
Photosynthesis
d)
Death
7.
What process occurs when coal (fossil fuel) is used for energy?
a)
Decomposition
b)
Combustion
c)
Pressurization 
d)
Respiration 
8.
Respiration is the process by which animals take in _____ and release _____. 
a)
photosynthesis, air
b)
carbon, oxygen
c)
oxygen
d)
oxygen, carbon dioxide
9.
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
10.
The average temperature of the surface of Earth has increased approximately 1°C in the past century. Which reason best explains this increase in temperature?
a)
lower levels of ozone in the atmosphere
b)
lower levels of nitrogen in the atmosphere
c)
higher levels of carbon dioxide and other greenhouse gases in the atmosphere
d)
higher levels of oxygen in the atmosphere
11.

Which compound does NOT contain carbon atoms?

a)

carbon dioxide

b)

ammonium

c)

calcium carbonate

d)

methane

12.
When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.
a)
Water
b)
Atmosphere
c)
Sun
d)
Air
13.
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
14.
What does not produce carbon dioxide?
a)
Photosynthesis
b)
Burning Fossil Fuels
c)
Animal respiration
d)
Plants decaying
15.
How do living organisms return carbon to the atmosphere in the carbon cycle?
a)
respiration and photosynthesis
b)
 decomposition and respiration
16.
In the carbon cycle, producers take in the gas __
a)
carbon dioxide
b)
oxygen
c)
nitrogen
d)
carbon monoxide
17.
How does the carbon in grass become part of a lion?
a)
The lion eats the grass
b)
Carbon from grass doesn't end up in a lion. 
c)
The carbon ends up in the lion's food chain. 
d)
The lion breathes in carbon given out by the plant
18.
All of the carbon in existence is continually recycled in the carbon cycle
a)
True
b)
False
19.
Which of the following removes carbon from the atmosphere?
a)
Combustion
b)
Respiration
c)
Photosynthesis
d)
Death
20.
Organisms that do not decompose can be buried and become what?
a)
water
b)
nutrients
c)
air
d)
fossil fuels
21.
If the plant population decreased, the amount of carbon would _________.
a)
Stay the same
b)
Increase
c)
Decrease
22.
If the plant population decreased, the amount of carbon would _________.
a)
Stay the same
b)
Increase
c)
Decrease
23.

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

24.

Which of the following creates a calcium carbonate structure?

a)

plants

b)

cows

c)

corals

d)

decomposers

25.

Humans burn fossil fuels and wood, releasing carbon dioxide into the atmosphere. This carbon dioxide is then absorbed by trees for photosynthesis. These processes are contributory to which chemical cycle?

a)

The carbon cycle

b)

The water cycle

c)

The nitrogen cycle

d)

The phosphorous cycle

26.

How does the human body return carbon to the atmosphere in the carbon cycle?

a)

Waste products

b)

Photosynthesis

c)

Cellular respiration

d)

Formation of glucose

27.

In the carbon cycle, animals can release carbon back into the cycle through __________ or through __________.

a)

burning . . . photosynthesis

b)

fixation . . . decomposition

c)

decomposition . . . photosynthesis

d)

respiration . . . decomposition

e)

respiration . . . photosynthesis

28.

Which of the following is an example of human impact on the carbon cycle?

a)

The increased production of methane gases from cattle farms

b)

The burning of fossil fuels

c)

The cutting down of trees for lumber

d)

Driving automobiles

e)

All of the above

29.

If a forest fire occurs, what will happen to the carbon in the forest?

a)

It will go into the soil

b)

It will go into the atmosphere

c)

It will runoff into nearby streams and rivers

d)

It will be destroyed

30.

How do organisms (living things) move carbon through the carbon cycle?

a)

Respiration only

b)

Decomposition only

c)

Photosynthesis, respiration, and decomposition

d)

Decomposition and sedimentation

e)

Respiration, decomposition, sedimentation, and photosynthesis

31.
In what process is Carbon transformed into chemical energy?
a)
Photosynthesis
b)
Respiration
c)
Primary Production
d)
Secondary Production
32.

The circulation of the element Carbon among Earth's atmosphere, land, oceans, and organisms is called _____________.

a)

the Carbon Cycle

b)

the Oxygen Cycle

c)

the Carbon dioxide Cycle

d)

the Water Cycle

33.

_____________ is an essential element of all living creatures.

a)

Gold

b)

Carbon

c)

Carbon dioxide

d)

Silver

34.

Carbon is used in the process called __________ by plants and algae to make food and the building blocks for growth.

a)

carbon cycle

b)

life

c)

photosynthesis

d)

decomposition

35.

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

a)

Water

b)

Carbon Dioxide

c)

Oxygen

d)

Sugar

36.

Choose all the items made out of carbon

a)

Food

b)

Animals

c)

Plants

d)

Tennis Racket

e)

Pretty much everything

37.

What do 'plants' do with the carbon they receive?

a)

They turn it into water

b)

They don't need carbon

c)

They turn it into food by photosynthesis

d)

They keep it forever

38.

How does carbon get from animals and back into the atmosphere? (CHOOSE ALL THAT APPLY)

a)

Respiration (breathing)

b)

After they die, they are broken down by decomposers

c)

Photosynthesis

d)

None of these

39.

How do animals get carbon?

a)

Photosynthesis

b)

They absorb it from the atmosphere

c)

The sun

d)

They eat other plants and animals

40.

What is CO2?

a)

Air

b)

Oxygen

c)

Carbon Dioxide

d)

Dioxide

41.

All things are made out of carbon or need carbon to live.

a)

True

b)

False

42.

What is causing global warming? (Choose All That Apply)

a)

The earth is too close to the sun

b)

There is too much carbon dioxide in the atmosphere

c)

Because we're running out of water

d)

Because we're cutting down all the trees and not planting more

43.

Why can't life live on Venus?

a)

Way too hot

b)

Too small

c)

Too far away

d)

Not enough gravity

44.

What made Venus way too hot for anything to live on it? (Choose All That Apply)

a)

Global Warming

b)

Too much Carbon Dioxide in the Atmosphere

c)

Too close to the sun

d)

It's just hot

45.

How is carbon recycled?

a)

The carbon cycle

b)

At the recycle plant

c)

It can't be recycled

d)

Through water

46.

Choose the things that take carbon dioxide (CO2) out of the air.

a)

Plants

b)

Water

c)

Trees

d)

Humans

47.

What are the top things that contribute to global warming? (Choose more than one)

a)

Cow Farts

b)

Burning Gas in cars and factories

c)

Cutting down Trees

d)

Solar Power

48.

What are some ways we can fight global warming? (Choose all that apply)

a)

Eat chicken instead of beef

b)

Plant trees

c)

Recycle

d)

Tell others to help fight

49.
In this diagram, how many ways can carbon enter the living world?
a)
one
b)
two
c)
three
d)
four
50.
Burning fossil fuel has which effect in the carbon cycle?
a)
It removes carbon dioxide from the atmosphere.
b)
It puts carbon dioxide under the ground.
c)
It adds carbon dioxide to the atmosphere.
d)
It has no effect in the carbon cycle.
51.
Which process takes carbon dioxide out of the atmosphere?
a)
respiration
b)
combustion
c)
decomposition
d)
photosynthesis
52.

What organisms form fossils?

a)

animals

b)

plants and animals

c)

CaCO2

d)

sedimentary rocks

53.

How does carbon get from the atmosphere into organisms?

a)

Decomposition

b)

Respirataion

c)

Photosynthesis

d)

Deposition

54.

How does carbon get from underground deposits (fossil fuels) into the atmosphere?

a)

Decomposition

b)

Deposition

c)

Photosynthesis

d)

Combustion

55.

Which of the following is the biggest carbon store?

a)

Plants

b)

Ocean

c)

Atmosphere

d)

Soil

56.
Which of the following is the correct equation for PHOTOSYNTHESIS?
a)
CO2 + light + H2O --> O2 + Sugar
b)
CO2 + sugar + H2O --> O2 + light
c)
O2 + light + H2O --> CO2 + Sugar
d)
CO2 + O2 + H2O --> Light+ Sugar
57.

How does carbon get from living organisms into the sediment?

a)

Decomposition

b)

Respiration

c)

Photosynthesis

d)

Deposition

58.

Select all of the storages of the carbon cycle

a)

Atmosphere

b)

Living organsisms

c)

Clouds

d)

Ocean

e)

Fossil fuels

59.
In the carbon cycle, producers take in the gas __
a)
carbon dioxide
b)
oxygen
c)
nitrogen
d)
carbon monoxide
60.
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
61.

What is happening at 2?

a)

respiration: releasing CO2

b)

decomposing CO2 in the soil

c)

photosynthesis: absorbing CO2

d)

turning CO2 from the atmosphere into organic molecules

62.

What is happening at 4?

a)

respiration: releasing CO2

b)

decomposing CO2 in the soil

c)

photosynthesis: absorbing CO2

d)

turning CO2 from the atmosphere into organic molecules

63.

Ocean coral and oysters use carbon to create _________.

a)

oxygen

b)

shells

c)

leaves

d)

food

64.
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
65.

What does not produce carbon dioxide?

a)

Photosynthesis

b)

Burning Fossil Fuels

c)

Animal respiration

d)

Plants decaying

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