Habitat destruction — Paper 2 · IGCSE Science - Combined 0653

13 Which two gases contribute most to global warming? A carbon dioxide and methane B carbon monoxide and carbon dioxide C methane and oxygen D oxygen and carbon monoxide

1 marks

Answer: A

This question in 0653/22 Feb/March 2017

13 What is an undesirable effect of overuse of fertilisers in agriculture? A acid rain B deforestation C eutrophication D global warming

1 marks

Answer: C

This question in 0653/21 May/June 2017

13 What is an undesirable effect of overuse of fertilisers in agriculture? A acid rain B deforestation C eutrophication D global warming

1 marks

Answer: C

This question in 0653/22 May/June 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

13 The graph shows changes in the number of different species in the water flowing along a river. At which point is untreated sewage released into the river? number of different species direction of water flow A B C D distance along river

1 marks

Answer: B

This question in 0653/23 Oct/Nov 2017

13 Eutrophication occurs after fertiliser is washed into a lake. What is not true of eutrophication? A Algae population in the lake decreases. B Bacteria population in the lake increases. C Nitrate concentration in the lake increases. D Oxygen concentration in the lake decreases.

1 marks

Answer: A

This question in 0653/22 Feb/March 2018

12 Fertilisers help crop plants grow. How might the overuse of fertilisers damage the ecosystem? A Animals feeding on the crop plants will die. B It will lead to flooding C Nutrients will not be available to plants. D Waterways will be polluted.

1 marks

Answer: D

This question in 0653/22 May/June 2018

13 What are the effects of acid rain? damage to limestone buildings damage to trees v 09 WD > <j & < x v x x

1 marks

Answer: B

This question in 0653/22 May/June 2018

13 Which are possible harmful effects of deforestation? global warming species extinction A v v B v x Cc x v D x x

1 marks

Answer: A

This question in 0653/21 Oct/Nov 2018

13 Which are possible harmful effects of deforestation? global warming species extinction A v v B v x Cc x v D x x

1 marks

Answer: A

This question in 0653/22 Oct/Nov 2018

13 Which are possible harmful effects of deforestation? global warming species extinction A v v B v x Cc x v D x x

1 marks

Answer: A

This question in 0653/23 Oct/Nov 2018

13 Eutrophication causes the death of organisms in water. Which row shows the changes that take place during eutrophication? oxygen decomposition respiration concentration A decreases increases decreases B increases decreases decreases C decreases decreases increases D increases increases decreases

1 marks

Answer: D

This question in 0653/22 Feb/March 2019

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 An increased volume of nitrate ions is washed into a lake. Why does this result in a decrease in the number of fish in the lake? A There is a decrease in the decomposition of producers. B There is a decrease in the growth of producers. C There is an increase in aerobic respiration by decomposers. D There is an increase in dissolved oxygen.

1 marks

Answer: C

This question in 0653/21 Oct/Nov 2019

13 The table shows the possible effects of two processes on the concentration of two gases in the atmosphere. concentration of gases in atmosphere process carbon dioxide oxygen 1 combustion of fossil fuels decrease increase 2 combustion of fossil fuels increase decrease 3 deforestation decrease increase 4 deforestation increase decrease Which rows show the effects of deforestation and combustion of fossil fuels on the concentration of carbon dioxide and oxygen in the atmosphere? A 1 and 3 B 1 and 4 C 2 and 3 D 2 and 4

1 marks

Answer: D

This question in 0653/22 Oct/Nov 2019

13 The flow diagram shows some stages in the eutrophication of a pond. more … 1 … into water more … 2 … more aerobic respiration by … 3 … reduced dissolved oxygen in water Which words complete gaps 1, 2 and 3? 1 2 3 A decomposers nitrates producers B decomposers producers nitrates C nitrates producers decomposers D nitrates decomposers producers

1 marks

Answer: C

This question in 0653/23 Oct/Nov 2019

13 What is an undesirable effect of overuse of fertilisers in agriculture? A acid rain B deforestation C eutrophication D global warming

1 marks

Answer: C

This question in 0653/22 Feb/March 2020

13 The list describes six events involved in the eutrophication of fresh water. P death of organisms that need dissolved oxygen in water Q increased aerobic respiration by decomposers R increased availability of nitrate and other ions S increased decomposition after death of producers T increased growth of producers U reduction in dissolved oxygen in water What is the normal sequence of events leading to eutrophication of a body of fresh water? A Q → S → R → U → T → P B R → T → S → Q → U → P C Q → T → S → R → U → P D R → S → Q → U → T → P

1 marks

Answer: B

This question in 0653/21 May/June 2020

13 Which stage of eutrophication must be reached to cause fish to die? A increased growth of decomposers B increased levels of nitrates C increased growth of plants D reduction of dissolved oxygen

1 marks

Answer: D

This question in 0653/22 May/June 2020

12 Which is an effect of the process of eutrophication of water? A increased fish population B increased growth of algae C decreased availability of nitrates and other ions in the water D increased levels of dissolved carbon dioxide in the water

1 marks

Answer: B

This question in 0653/22 Oct/Nov 2020

13 Some stages in the process of eutrophication are listed. 1 reduction in dissolved oxygen 2 increased aerobic respiration by decomposers 3 increased availability of nitrates 4 death of organisms requiring dissolved oxygen 5 increased growth of producers and increased decomposition after death of producers In which sequence do these stages take place? A 1  4  3  5  2 B 3  1  5  2  4 C 3  5  2  1  4 D 4  3  1  2  5

1 marks

Answer: C

This question in 0653/23 Oct/Nov 2020

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 During eutrophication, what is the main reason for the increased growth of producers? A increased availability of carbon dioxide B increased availability of nitrate C increased availability of oxygen D increased availability of water

1 marks

Answer: B

This question in 0653/22 Oct/Nov 2021

13 The eutrophication of water has a number of stages. 1 2 3 increased growth dissolved oxygen available of producers decreases and nitrate / ion levels aquatic organisms increase die 4 5 increased aerobic death respiration by of producers decomposers What is the correct order of the stages? A 1  3  5  4  2 B 1  2  5  4  3 C 3  1  5  4  2 D 3  1  4  2  5

1 marks

Answer: C

This question in 0653/23 Oct/Nov 2021

13 In the process of eutrophication, what causes the increased growth of producers? A increased carbon dioxide availability B increased decomposition C increased nitrate ion availability D increased oxygen availability

1 marks

Answer: C

This question in 0653/21 May/June 2022

13 The flow chart shows some of the steps in the process of eutrophication. increased availability of nitrates and other ions ↓ step X ↓ increased decomposition after death of producers ↓ step Y ↓ reduction in amount of dissolved oxygen ↓ death of fish requiring dissolved oxygen in water What is happening at step Y? A increased aerobic respiration by decomposers B decreased aerobic respiration by decomposers C increased growth of aquatic plants D decreased growth of aquatic plants

1 marks

Answer: A

This question in 0653/21 May/June 2023

13 Eutrophication typically occurs as the result of nitrates and other ions accumulating in bodies of water. Eutrophication involves the five processes listed. 1 death of organisms that require dissolved oxygen 2 increased aerobic respiration by decomposers 3 increased decomposition after death of producers 4 increased growth of producer organisms 5 reduction of amount of dissolved oxygen in water Which sequence of processes is correct? A 1  3  2  4  5 B 4  3  2  5  1 C 1  2  4  3  5 D 4  5  3  2  1

1 marks

Answer: B

This question in 0653/23 May/June 2023

13 What occurs as a result of eutrophication? A There is a decrease in the availability of nitrate ions. B There is a decrease in the availability of oxygen molecules. C There is a decrease in the growth rate of producers. D There is a decrease in the rate of decomposition.

1 marks

Answer: B

This question in 0653/23 Oct/Nov 2023

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

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