Carbon Cycle and the Biosphere

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

Combustion is another word for _______________.

• photosynthesis

• consumption

• decomposition

• burning

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

In what process is carbon from the atmosphere transformed into chemical energy (sugars)?

• Photosynthesis

• Respiration

• Primary Production

• Secondary Production

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

Carbon can be found in...?

• The atmosphere
• Inside of the Earth
• Fossil fuels
• All of the above!