Carbon cycle — Paper 1 · IGCSE Sciences - Co-ordinated (9-1) 0973

13 In the carbon cycle, which process decreases the level of carbon dioxide in the atmosphere? A combustion B decomposition C photosynthesis D respiration

1 marks

Answer: C

This question in 0973/11 May/June 2019

13 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 0973/11 May/June 2020

13 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 0973/12 May/June 2020

13 What does not contribute to the carbon cycle? A combustion B deforestation C transpiration D photosynthesis

1 marks

Answer: C

This question in 0973/11 May/June 2021

13 Which process removes carbon dioxide from the atmosphere? A combustion B photosynthesis C respiration D transpiration

1 marks

Answer: B

This question in 0973/12 May/June 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 0973/11 Oct/Nov 2021

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 0973/11 May/June 2022

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 0973/12 May/June 2022

13 What is an undesirable effect of deforestation? A It increases the oxygen concentration of the atmosphere. B It leads to erosion and loss of soil. C It makes land available for agriculture. D It pollutes the air with methane.

1 marks

Answer: B

This question in 0973/11 Oct/Nov 2022

13 The graph shows the change in atmospheric carbon dioxide levels over time. 400 390 380 mass of 370 carbon 360 dioxide 350 / arbitrary 340 units 330 320 310 300 1958 1963 1968 1973 1978 1983 1988 1993 1998 2003 2008 2013 year A reduction of which process could cause the change in carbon dioxide shown? A combustion B decomposition C photosynthesis D respiration

1 marks

Answer: C

This question in 0973/11 May/June 2023

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 0973/11 Oct/Nov 2023

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

1 marks

Answer: C

This question in 0973/11 May/June 2024

13 The diagram shows gas exchange by two groups of organisms during the hours of darkness. the atmosphere P S Q R producers consumers Which letters represent gases that are part of the carbon cycle? A P and Q B P and R C P and S D Q and S

1 marks

Answer: B

This question in 0973/12 May/June 2024

13 The diagram shows part of the carbon cycle. carbon dioxide in the atmosphere X factories and power stations plants animals fossil fuels Which process does X represent? A combustion B decomposition C photosynthesis D respiration

1 marks

Answer: C

This question in 0973/11 Oct/Nov 2024