Free Printable Carbon Cycle

Worksheets

Carbon Cycle

Total questions: 25

Worksheet time: 13mins

Name

Class

Date

Which compound does NOT contain carbon atoms?

carbon dioxide

ammonium

calcium carbonate

methane

When humans burn fossil fuels, most of the carbon quickly enters the as carbon dioxide.

Water

Atmosphere

Sun

Air

Which one of these does not add CO2 to the atmosphere?

cooking with gas

planting trees

burning wood

riding in a bus

What does not produce carbon dioxide?

Photosynthesis

Burning Fossil Fuels

Animal respiration

Plants decaying

How do living organisms return carbon to the atmosphere in the carbon cycle?

respiration and photosynthesis

decomposition and respiration

In the carbon cycle, producers take in the gas __

carbon dioxide

oxygen

nitrogen

carbon monoxide

How does the carbon in grass become part of a lion?

The lion eats the grass

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

The carbon ends up in the lion's food chain.

The lion breathes in carbon given out by the plant

All of the carbon in existence is continually recycled in the carbon cycle

True

False

Which of the following removes carbon from the atmosphere?

Combustion

Respiration

Photosynthesis

Death

10.

Organisms that do not decompose can be buried and become what?

water

nutrients

air

fossil fuels

11.

If the plant population decreased, the amount of carbon would _________.

Stay the same

Increase

Decrease

12.

Which is a true statement?

Humans depend on oxygen, plants depend on carbon dioxide

Plants produce carbon dioxide

Humans depend on carbon dioxide, plants depend on oxygen

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

13.

Combustion is another word for __________.

Transportation

Respiration

Fossil Fuels

Burning

14.

TRUE or FALSE?
All of the carbon in existence is continually recycled in the carbon cycle.

True

False

15.

Carbon can be found in...

The atmosphere

Soil

Fossil fuels

All of the above

16.

What process occurs when coal (fossil fuel) is used for energy?

Decomposition

Combustion

Pressurization

Respiration

17.

Respiration is the process by which animals take in _____ and release _____.

photosynthesis, air

carbon, oxygen

oxygen

oxygen, carbon dioxide

18.

Plants use ____________ to make their own food

Water

Sunlight

Carbon dioxide

All of these

19.

The process of plants turning carbon dioxide and water into oxygen and sugar is called

Respiration

Oxidation

Photosynthesis

Combustion

20.

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

Carbon dioxide

Oxygen

Sunlight

Water

21.

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

Waste products

Photosynthesis

Cellular respiration

Formation of glucose

22.

Why does cutting down trees increase global warming?

trees soak up carbon dioxide

trees provide shade which counteracts global warming

trees absorbs the sun's energy without radiating back into the atmosphere

trees drain greenhouse gases like methane from soil

23.

Why is burning fossil fuels harmful?

they cause cancer

They can get extremely hot

it increases the amount of carbon dioxode/greenhouse gases in the air

this would destroy fossils

24.

Earth has a fixed amount of _____.

trees

carbon

carbon dioxide

25.

In the atmosphere, carbon attaches to oxygen to form _____.

CO₂

C₆H₁₂O₆

100 %

Carbon Cycle

Total questions: 25

Worksheet time: 13mins

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