Ecosystem cycles

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

In what process is Carbon transformed into chemical energy?

• Photosynthesis
• Respiration
• Primary Production
• Secondary Production

The movement of carbon dioxide and oxygen on Earth by the processes of respiration and photosynthesis.

• Carbon Dioxide-Oxygen Cycle
• Oxygen
• Carbon Dioxide
• Respiration

A gas produced by plants during photosynthesis that animals use for respiration.

• Oxygen
• Carbon Dioxide
• Methane
• Sulphur

A gas produced by animals during respiration that plants use for photosynthesis.

• Oxygen
• Carbon Dioxide
• Photosynthesis
• Radiation