Carbon Cycle

Multiple Choice

Why is carbon considered essential for all living organisms?

• Because it forms the backbone of all organic molecules

• Because it is always found as water

• Because it is only present in the atmosphere

• Because it is not found in plants

Open Ended

Based on the first two slides, list at least three places where carbon can be found in the environment or in living things.

Multiple Choice

How do animals get carbon?

• By eating plants and or other animals.

• They absorb it from the atmosphere.

• From the ground

• They do not get carbon from anywhere.

Multiple Choice

During which process do plants and animals return carbon to the atmosphere?

• Photosynthesis

• Cellular Respiration

• Decomposition

• Fossil fuel combustion

Multiple Choice

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

• Water
• Atmosphere
• Sun
• Air

Multiple Choice

When organisms die, what process returns their carbon back into the atmosphere?

• Respiration

• Decomposition

• Combustion

• Erosion

Multiple Choice

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

• water
• nutrients
• air
• fossil fuels

Multiple Choice

Which kind of organisms are decomposers?

• Bacteria and Fungi

• Fungi and Insects

• Bacteria and Insects

• Fungi and fruit trees

Multiple Choice

Which organisms are responsible for removing CO2 from the atmosphere and converting it into simple sugars?

• Animals

• Photosynthetic organisms

• Fungi

• Decomposers

Multiple Choice

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

• Water
• Atmosphere
• Sun
• Air

Multiple Choice

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

• The increased production of methane gases from cattle farms

• The burning of fossil fuels

• The cutting down of trees for lumber

• Driving automobiles

• All of the above