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# 1
Multiple Choice
What is the primary role of plants in the carbon cycle?
- To emit carbon dioxide
- To absorb oxygen
- To absorb carbon dioxide
- To release methane
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Middle 8
Science
6
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# 2
Multiple Choice
Which process releases carbon dioxide back into the atmosphere?
- Photosynthesis
- Respiration
- Nitrogen fixation
- Phosphorylation
# 3
Multiple Choice
What human activity significantly increases carbon dioxide levels in the atmosphere?
- Fishing
- Deforestation
- Recycling
- Organic farming
# 4
Multiple Choice
Which gas is a major component of the Earth's atmosphere and is involved in the carbon cycle?
- Nitrogen
- Oxygen
- Carbon dioxide
- Methane
# 5
Multiple Choice
Which of the following is a long-term carbon storage method in the carbon cycle?
- Burning fossil fuels
- Soil erosion
- Formation of fossil fuels
- Plant respiration
# 6
Multiple Choice
What role do decomposers play in the carbon cycle?
- They produce oxygen
- They fix nitrogen
- They break down dead material, releasing carbon
- They create fossil fuels
# 7
Multiple Choice
Which process involves the conversion of carbon dioxide and water into glucose and oxygen?
- Respiration
- Photosynthesis
- Transpiration
- Fermentation
# 8
Multiple Choice
What impact does increasing carbon dioxide have on Earth's climate?
- It cools the atmosphere
- It has no effect
- It contributes to global warming
- It eliminates greenhouse gases
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