1. Which of these processes causes the movement of carbon from the atmosphere to the biosphere?

• photosynthesis
• respiration
• decay
• diffusion

2. Which of these organisms release carbon dioxide by feeding on dead organic matter such as plants and animals?

• producer
• herbivore
• decomposer
• carnivore

3. Which of these is released as a result of burning fossil fuels?

• ammonia
• carbon dioxide
• ozone
• chlorine

4, By which process does carbon move from the biosphere into the geosphere?

• tectonic activity
• photosynthesis
• combustion
• fossil fuel formation

5. Which gas is released during plant respiration?

• oxygen
• carbon dioxide
• ammonia
• nitrogen

6. Which organisms take in carbon dioxide?

• humans
• trees
• deer
• birds

7. How does carbon get cycled back into the earth?

• through decomposers
• through the greenhouse effect
• through burning of fossil fuels
• through photosynthesis

8. How does carbon dioxide cycle back and forth between plants and animals?

• Plants give off carbon dioxide, and animals take in carbon dioxide
• Animals breathe out carbon dioxide, and plants take in carbon dioxide
• Plants and animals breathe in carbon dioxide
• Plants and animals both breathe out carbon dioxide

9. What happens when gases, like carbon dioxide, get trapped in the atmosphere?

• The temperature of the planet rises
• Plants produce more oxygen
• The amount of greenhouse gas decreases
• The number of decomposers increases

10. Which process does not add carbon to the atmosphere?

• Photosynthesis
• Burning fossil fuels
• Human respiration
• Decaying animals