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The carbon cycle

9th grade (Year 10 in England) · 16 questions · Common Core: NGSS.HS-LS2-5, NGSS.MS-LS2-3 · England: KS3 Chemistry: Earth and atmosphere, KS4 Combined Science: Ecosystems

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1
Question 1
Which process adds carbon dioxide to the air?
- A. decomposition by microorganisms
- B. photosynthesis
- C. algae growing in the ocean
- D. carbon dioxide dissolving in the sea
2
Question 2
Does this process remove carbon dioxide from the air or add it: burning forests?
- A. removes CO₂ from the air
- B. adds CO₂ to the air
3
Question 3
How does carbon pass from a plant into an animal?
- A. The plant photosynthesises inside the animal
- B. Through the soil only
- C. The animal breathes in the plant
- D. The animal eats the plant
4
Question 4
Which process adds carbon dioxide to the air?
- A. volcanic eruptions
- B. trees growing
- C. photosynthesis
- D. carbon dioxide dissolving in the sea
5
Question 5
Does this process remove carbon dioxide from the air or add it: trees growing?
- A. removes CO₂ from the air
- B. adds CO₂ to the air
6
Question 6
What role do microorganisms play in the carbon cycle?
- A. They decompose dead organisms, releasing carbon dioxide by respiration
- B. They photosynthesise in the dark
- C. They turn carbon into oxygen
- D. They have no role
7
Question 7
Which process removes carbon dioxide from the air?
- A. decomposition by microorganisms
- B. volcanic eruptions
- C. respiration
- D. trees growing
8
Question 8
Does this process remove carbon dioxide from the air or add it: photosynthesis?
- A. removes CO₂ from the air
- B. adds CO₂ to the air
9
Question 9
How does carbon pass from a plant into an animal?
- A. The animal eats the plant
- B. The plant photosynthesises inside the animal
- C. The animal breathes in the plant
- D. Through the soil only
10
Question 10
Which process adds carbon dioxide to the air?
- A. volcanic eruptions
- B. algae growing in the ocean
- C. trees growing
- D. carbon dioxide dissolving in the sea
11
Question 11
Does this process remove carbon dioxide from the air or add it: burning fossil fuels?
- A. removes CO₂ from the air
- B. adds CO₂ to the air
12
Question 12
Why has the carbon dioxide level in the air increased since the 1800s?
- A. Burning fossil fuels and cutting down forests
- B. Fewer volcanoes
- C. More photosynthesis
- D. The Sun has become colder
13
Question 13
Which process adds carbon dioxide to the air?
- A. photosynthesis
- B. algae growing in the ocean
- C. carbon dioxide dissolving in the sea
- D. decomposition by microorganisms
14
Question 14
Does this process remove carbon dioxide from the air or add it: respiration?
- A. removes CO₂ from the air
- B. adds CO₂ to the air
15
Question 15
How does carbon pass from a plant into an animal?
- A. The plant photosynthesises inside the animal
- B. The animal eats the plant
- C. Through the soil only
- D. The animal breathes in the plant
16
Question 16
Which process adds carbon dioxide to the air?
- A. burning forests
- B. photosynthesis
- C. carbon dioxide dissolving in the sea
- D. algae growing in the ocean

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Answer key: The carbon cycle

1. A. decomposition by microorganisms
2. B. adds CO₂ to the air
3. D. The animal eats the plant
4. A. volcanic eruptions
5. A. removes CO₂ from the air
6. A. They decompose dead organisms, releasing carbon dioxide by respiration
7. D. trees growing
8. A. removes CO₂ from the air
9. A. The animal eats the plant
10. A. volcanic eruptions
11. B. adds CO₂ to the air
12. A. Burning fossil fuels and cutting down forests
13. D. decomposition by microorganisms
14. B. adds CO₂ to the air
15. B. The animal eats the plant
16. A. burning forests