Carbon cycle — Paper 2 · IGCSE Sciences - Co-ordinated (Double) 0654

3 What could deforestation cause? A a decrease in carbon dioxide levels and a decrease in flooding B a decrease in carbon dioxide levels and an increase in flooding C an increase in carbon dioxide levels and a decrease in flooding D an increase in carbon dioxide levels and an increase in flooding

1 marks

Answer: D

This question in 0654/21 Oct/Nov 2017

12 The diagram shows part of the carbon cycle. Which arrow represents plant respiration? carbon compounds A in the air B carbon compounds carbon compounds in plants C in rocks, sea and soil D carbon compounds in animals

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2018

12 The diagram shows part of the carbon cycle. Which arrow represents plant respiration? carbon compounds A in the air B carbon compounds carbon compounds in plants C in rocks, sea and soil D carbon compounds in animals

1 marks

Answer: B

This question in 0654/22 Oct/Nov 2018

13 The diagram shows part of the carbon cycle. Which arrow represents plant respiration? carbon compounds A in the air B carbon compounds carbon compounds in plants C in rocks, sea and soil D carbon compounds in animals

1 marks

Answer: B

This question in 0654/23 Oct/Nov 2018

13 The diagram shows the carbon cycle. Which process represents decomposition? A B atmosphere plants animals C dead D organisms fossil fuels

1 marks

Answer: C

This question in 0654/23 May/June 2019

13 The diagram shows some of the processes in the carbon cycle. Which process is respiration? carbon dioxide in the atmosphere D A plants B dead plants and animals animals C microorganisms

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2019

13 The diagram shows a simplified carbon cycle. Which labelled arrow represents respiration? CO2 B C A green D animals plants fossil fuels

1 marks

Answer: C

This question in 0654/21 Oct/Nov 2021

13 The diagram shows a simplified carbon cycle. Which labelled arrow represents respiration? CO2 B C A green D animals plants fossil fuels

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2021

13 The diagram shows a simplified carbon cycle. Which labelled arrow represents respiration? CO2 B C A green D animals plants fossil fuels

1 marks

Answer: C

This question in 0654/23 Oct/Nov 2021

13 Forests are cut down and burnt in deforestation programmes. As a result of this, which gas in the atmosphere increases in concentration? A carbon dioxide B hydrogen C nitrogen D oxygen

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2023

13 The concentration of carbon dioxide in the atmosphere has increased during the last 200 years. What has contributed to this increase? A burning large areas of forest B increasing use of pesticides C planting more crops D using fewer fossil fuels

1 marks

Answer: A

This question in 0654/22 Oct/Nov 2023

13 Which row describes the effects of deforestation? level of risk of carbon dioxide flooding in the air A decreases decreases B decreases increases C increases decreases D increases increases

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2023

13 Deforestation changes the concentration of carbon dioxide and oxygen in the atmosphere. Which statement is correct? A There is less carbon dioxide and more oxygen because there are fewer trees photosynthesising. B There is less carbon dioxide and less oxygen because there are fewer trees respiring. C There is more carbon dioxide and less oxygen because there are fewer trees photosynthesising. D There is more carbon dioxide and more oxygen because there are fewer trees respiring.

1 marks

Answer: C

This question in 0654/22 Feb/March 2024

13 The diagram shows part of the carbon cycle. Which process, due to human activities, has increased the concentration of carbon dioxide in the atmosphere? carbon dioxide in the atmosphere A D animals plants C B decaying matter fossils

1 marks

Answer: D

This question in 0654/23 May/June 2024

13 Which processes change the amount of carbon dioxide in the air? process causing increase process causing decrease in carbon dioxide in carbon dioxide A burning fossil fuels photosynthesis in plants B photosynthesis in plants respiration in animals C respiration in animals respiration in plants D respiration in plants burning fossil fuels

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2024