Habitat destruction — Paper 2 · IGCSE Sciences - Co-ordinated (Double) 0654

13 Which line shows how the oxygen concentration of the water changes after excess fertiliser has entered a stream? A oxygen B concentration of the water C D distance downstream fertiliser run-off

1 marks

Answer: B

This question in 0654/21 May/June 2017

9 The list shows some effects of human activities. P global warming Q loss of fossil fuels R water pollution S flooding Which effects can be the result of deforestation? A P and Q B P and S C Q and R D R and S

1 marks

Answer: B

This question in 0654/22 May/June 2017

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 Lichens grow on the bark of trees. Lichen growth can be affected by sulfur dioxide and other pollutants. Their absence is often used as an indicator of pollution. The table shows the percentage cover of lichens at distances from the centre of a large city. distance from percentage cover by city centre / km lichens on the bark 0 3 5 10 8 15 12 30 20 40 Which conclusion can be made from these results? A Lichen growth is reduced by sulfur dioxide. B Lichens cannot survive in the city. C Lichens grow better further away from the city centre. D Lichens grow equally well on all species of trees.

1 marks

Answer: C

This question in 0654/22 Oct/Nov 2017

13 The flow diagram shows the consequence of the overuse of fertilisers on farm land. leaching fast growth death of fast growth death of → → → → fertiliser of algae algae of X fish Which group of organisms is represented by X? A bacteria B fish C invertebrates D plants

1 marks

Answer: A

This question in 0654/21 Oct/Nov 2018

13 One of the problems with the overuse of fertilisers is the eutrophication of lakes and rivers. What effect does this have on the water? oxygen bacterial concentration activity A decreases decreases B decreases increases C increases decreases D increases increases

1 marks

Answer: B

This question in 0654/22 May/June 2019

13 Some of the stages of eutrophication are listed. 1 death of organisms requiring dissolved oxygen in water 2 increased availability of nitrate and other ions 3 increased decomposition after death of producers 4 reduction in dissolved oxygen What is the correct order of these stages in eutrophication? A 2 → 1 → 4 → 3 B 2 → 3 → 4 → 1 C 3 → 2 → 4 → 1 D 3 → 4 → 1 → 2

1 marks

Answer: B

This question in 0654/21 Oct/Nov 2019

13 The list shows changes that occur in a lake which is polluted by nitrogen-containing fertiliser. 1 decomposers feed on plants 2 growth of algae increases on the lake’s surface 3 oxygen levels decrease in the lake 4 underwater plants die In which order do these changes occur? A 2 → 4 → 1 → 3 B 2 → 3 → 4 → 1 C 3 → 4 → 2 → 1 D 3 → 4 → 1 → 2

1 marks

Answer: A

This question in 0654/22 Oct/Nov 2019

13 Which line shows how the oxygen concentration of the water changes after excess fertiliser has entered a stream? A oxygen B concentration of the water C D distance downstream fertiliser run-off

1 marks

Answer: B

This question in 0654/21 May/June 2020

13 Which line shows how the oxygen concentration of the water changes after excess fertiliser has entered a stream? A oxygen B concentration of the water C D distance downstream fertiliser run-off

1 marks

Answer: B

This question in 0654/22 May/June 2020

13 Which line shows how the oxygen concentration of the water changes after excess fertiliser has entered a stream? A oxygen B concentration of the water C D distance downstream fertiliser run-off

1 marks

Answer: B

This question in 0654/23 May/June 2020

13 During eutrophication, what reduces the concentration of dissolved oxygen in the water? A decreased photosynthesis by producers B decreased respiration by decomposers C increased photosynthesis by producers D increased respiration by decomposers

1 marks

Answer: D

This question in 0654/21 Oct/Nov 2020

13 Which row about some of the stages of eutrophication is correct? growth of growth of respiration of concentration of producers decomposers decomposers dissolved oxygen A decreases increases decreases increases B decreases decreases increases increases C increases decreases decreases decreases D increases increases increases decreases

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2020

13 What decreases as a result of deforestation? A available habitats B atmospheric carbon dioxide C flooding D soil loss

1 marks

Answer: A

This question in 0654/21 May/June 2021

13 Putting too much fertiliser on soil can lead to eutrophication in water. Which substance, dissolved in water, is reduced in concentration as a result of eutrophication? A carbon dioxide B ions C nitrogen D oxygen

1 marks

Answer: D

This question in 0654/23 May/June 2021

13 Which row shows an effect of a human activity on the environment? activity effect A cutting down forests acid rain B cutting down forests eutrophication C overuse of fertilisers acid rain D overuse of fertilisers eutrophication

1 marks

Answer: D

This question in 0654/22 Feb/March 2022

13 Which flowchart correctly shows the stages of eutrophication? A B C D increased nitrates decreased nitrates decreased nitrates increased nitrates decrease in decrease in increase in increase in producers producers producers producers decrease in increase in decrease in increase in decomposition decomposition decomposition decomposition decrease in increase in decrease in increase in aerobic respiration anaerobic respiration anaerobic respiration aerobic respiration by decomposers by decomposers by decomposers by decomposers increase in reduction in increase in reduction in oxygen oxygen oxygen oxygen increase in death of increase in death of organisms organisms organisms organisms

1 marks

Answer: D

This question in 0654/21 May/June 2022

13 When fertiliser is washed into lakes, it leads to changes in the oxygen concentration and the population of algae. algae oxygen time Which statement explains the change in oxygen over time? A The algae use up the oxygen for photosynthesis. B Decomposer bacteria use up the oxygen for respiration. C Nitrates react with the oxygen. D The algae use up the oxygen for respiration.

1 marks

Answer: B

This question in 0654/22 May/June 2022

13 How does deforestation change the concentrations of carbon dioxide and oxygen in the atmosphere? carbon dioxide oxygen A rise fall B rise rise C fall rise D fall fall

1 marks

Answer: A

This question in 0654/23 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 0654/21 Oct/Nov 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 0654/22 Oct/Nov 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 0654/23 Oct/Nov 2022

13 What causes eutrophication? A combustion of fossil fuels B cutting down of forests C discarded plastic rubbish D overuse of nitrogen-containing fertiliser

1 marks

Answer: D

This question in 0654/21 May/June 2023

13 The flow diagram shows the consequence of the overuse of fertilisers on farm land. leaching fast growth death of fast growth death of     fertiliser of algae algae of X fish Which group of organisms is represented by X? A decomposers B fish C invertebrates D plants

1 marks

Answer: A

This question in 0654/22 May/June 2023

13 What decreases as a result of eutrophication? A aerobic respiration by decomposers B decomposition of dead producers C dissolved oxygen in the water D growth of producers

1 marks

Answer: C

This question in 0654/23 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 0654/21 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 The list shows changes that occur in a lake which is polluted by fertiliser. 1 Decomposers feed on aquatic plants. 2 Growth of algae increases. 3 Oxygen levels decrease in the lake. 4 Aquatic plants die. In which order do these changes occur? A 2  4  1  3 B 2  3  4  1 C 3  4  2  1 D 3  4  1  2

1 marks

Answer: A

This question in 0654/21 May/June 2024

13 Which graph represents a pollution incident in a lake causing eutrophication? A B concentration concentration time time C D concentration concentration time time key nitrogen decomposers oxygen

1 marks

Answer: B

This question in 0654/22 Oct/Nov 2024

13 The release of fertiliser into rivers and lakes causes eutrophication which can lead to the death of fish. What causes the fish to die? A Decreased photosynthesis by producers reduces the carbon dioxide. B Increased photosynthesis by producers reduces the oxygen. C Increased decomposition reduces the carbon dioxide. D Increased decomposition reduces the oxygen.

1 marks

Answer: D

This question in 0654/23 Oct/Nov 2024

13 What could be a result of deforestation? A a decrease in flooding because there are fewer tree roots B an increase in carbon dioxide because there are fewer tree leaves respiring C a decrease in soil loss because there are fewer tree roots D an increase in extinction because there are fewer habitats

1 marks

Answer: D

This question in 0654/22 Feb/March 2025

12 Which row shows a cause and an effect that results from deforestation? cause effect A fewer tree roots decrease in flooding B fewer tree leaves respire increase in carbon dioxide C fewer tree roots decrease in soil erosion D fewer habitats increase in extinctions

1 marks

Answer: D

This question in 0654/23 May/June 2025