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7.2 The Carbon Cycle

Total questions: 20

Worksheet time: 16mins

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.
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
3.
Combustion is another word for _______________.
a)
a train
b)
a bus
c)
a dog
d)
burning
4.
What does not produce carbon dioxide?
a)
Photosynthesis
b)
Burning Fossil Fuels
c)
Animal respiration
d)
Plants decaying
5.
How do living organisms return carbon to the atmosphere in the carbon cycle?
a)
respiration and photosynthesis
b)
 decomposition and respiration
6.
In the carbon cycle, producers take in the gas __
a)
carbon dioxide
b)
oxygen
c)
nitrogen
d)
carbon monoxide
7.

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

8.
In what process is Carbon transformed into chemical energy?
a)
Photosynthesis
b)
Respiration
c)
Primary Production
d)
Secondary Production
9.
All of the carbon in existence is continually recycled in the carbon cycle
a)
True
b)
False
10.
Which of the following removes carbon from the atmosphere?
a)
Combustion
b)
Respiration
c)
Photosynthesis
d)
Death
11.
Organisms that do not decompose can be buried and become what?
a)
water
b)
nutrients
c)
air
d)
fossil fuels
12.
If the plant population decreased, the amount of carbon would _________.
a)
Stay the same
b)
Increase
c)
Decrease
13.
Why is the ocean important to the carbon cycle?
a)
It keeps sediment containing carbon underwater for millions of years
b)
The ocean gives out more carbon then it takes in (increases global warming)
c)
The ocean isn't important to the carbon cycle.
14.
Carbon can be found in...?
a)
The atmosphere
b)
Inside of the Earth
c)
Fossil fuels
d)
All of the above!
15.
Carbon dioxide is produced by the burning of fossil fuels
a)
True
b)
False
16.

How does carbon from dead organisms naturally enter the atmosphere?

a)

Photosynthesis

b)

Decomposition

c)

Respiration

d)

Combustion

17.

If someone is cremated how would carbon from their body re-enter the atmosphere?

a)

Decomposition

b)

Respiration

c)

Combustion

d)

Photosynthesis

18.

3 ways carbon enters the atmosphere

a)

Decomposition

b)

Photosynthesis

c)

Respiration

d)

Combustion

19.

A process that can "lock away" carbon for millions of years

a)

Decomposition

b)

Respiration

c)

Breathing

d)

Fossilisation

20.

Which of the following would increase CO2 in the atmosphere?

a)

Hunting animals

b)

Deforestation

c)

A bird species becomes extinct

d)

A factory is closed down

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