Carbon cycle — Paper 2 · IGCSE Science - Combined 0653

12 The diagram represents part of the carbon cycle. 1 atmospheric green plants carbon dioxide 2 3 animals 4 microorganisms Which arrows show where respiration takes place? A 1, 3 and 4 B 1 and 3 only C 2, 3 and 4 D 2 and 3 only

1 marks

Answer: C

This question in 0653/21 Oct/Nov 2017

13 Which graph shows the effect of large-scale deforestation on the changes in the concentrations of oxygen and carbon dioxide in the air? A B O2 changes in changes in concentration concentration O2 CO2 CO2 time after deforestation time after deforestation C D O2 changes in O2 changes in concentration concentration CO2 CO2 time after deforestation time after deforestation

1 marks

Answer: C

This question in 0653/22 Oct/Nov 2017

12 The diagram shows part of the carbon cycle. Which arrow represents a process that releases oxygen into the atmosphere? carbon dioxide in the air B A carbohydrates in dead organic matter C D death carbohydrates in animals death carbohydrates in green plants

1 marks

Answer: C

This question in 0653/22 Feb/March 2018

13 Which changes to the composition of the atmosphere are caused by cutting down forests? carbon dioxide gas oxygen gas A decreases decreases B decreases increases C increases decreases D increases increases

1 marks

Answer: C

This question in 0653/21 May/June 2019

13 Which process takes carbon dioxide out of the air? A combustion B decomposition C photosynthesis D plant respiration

1 marks

Answer: C

This question in 0653/21 May/June 2021

13 Which process takes carbon dioxide out of the air? A combustion B decomposition C photosynthesis D plant respiration

1 marks

Answer: C

This question in 0653/22 May/June 2021

13 Which process takes carbon dioxide out of the air? A combustion B decomposition C photosynthesis D plant respiration

1 marks

Answer: C

This question in 0653/23 May/June 2021

13 Carbon dioxide levels in the atmosphere have risen by 30% in the last 60 years. Which actions have contributed to this increase? 1 burning fossil fuels 2 deforestation 3 extinction of species A 1 only B 1 and 2 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: B

This question in 0653/21 Oct/Nov 2021

13 Which labelled box represents plants in the carbon cycle? carbon dioxide in the atmosphere A B C D

1 marks

Answer: C

This question in 0653/22 Feb/March 2022

13 The diagram shows part of the carbon cycle. photosynthesis green Y plants animals combustion X What are X and Y? X Y A fossil fuel carbon dioxide B carbon dioxide oxygen C fossil fuel oxygen D oxygen carbon dioxide

1 marks

Answer: A

This question in 0653/21 Oct/Nov 2023

13 The diagram shows part of the carbon cycle. carbon dioxide in air 3 carbon compounds 4 in animals 1 2 carbon compounds in plants Where does respiration occur? A 1 only B 2 and 3 C 3 and 4 D 3 only

1 marks

Answer: C

This question in 0653/22 Oct/Nov 2023

12 The diagram shows part of the carbon cycle. carbon dioxide in 1 the atmosphere 5 2 fossil fuels 3 4 carbon compounds carbon compounds in animals in plants carbon compounds in dead animals and plants Which processes use oxygen and produce oxygen? uses produces oxygen oxygen A 1 2 B 2 3 C 3 4 D 4 5

1 marks

Answer: D

This question in 0653/23 Oct/Nov 2023

13 Which part of the carbon cycle removes carbon dioxide from the atmosphere? A combustion B decomposition C photosynthesis D respiration

1 marks

Answer: C

This question in 0653/22 Feb/March 2024

13 The diagram shows part of the carbon cycle. carbon dioxide in the atmosphere 3 1 4 2 plants animals and trees fossil fuels dead organisms Which arrows represent decomposition and combustion? A 1 and 2 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: D

This question in 0653/22 May/June 2024

13 Some effects that may happen in an ecosystem are listed. 1 decrease in atmospheric carbon dioxide 2 increase in atmospheric carbon dioxide 3 build up of soil 4 loss of soil Which effects can be caused by deforestation? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: D

This question in 0653/23 May/June 2024

13 What are the effects of deforestation and the combustion of fossil fuels on the concentrations of carbon dioxide and oxygen in the atmosphere? concentration of concentration of carbon dioxide oxygen A decreases decreases B decreases increases C increases decreases D increases increases

1 marks

Answer: C

This question in 0653/23 Oct/Nov 2024

10 Which row shows the effect of deforestation on oxygen and carbon dioxide concentrations in the atmosphere? oxygen carbon dioxide concentration concentration A decreases increases B decreases no change C increases decreases D no change increases

1 marks

Answer: A

This question in 0653/21 May/June 2025

13 Which changes to the composition of the atmosphere are caused by cutting down forests? concentration of concentration of carbon dioxide gas oxygen gas A decreases decreases B decreases increases C increases decreases D increases increases

1 marks

Answer: C

This question in 0653/21 Oct/Nov 2025