Pollution — Paper 1 · IGCSE Biology (9-1) 0970

39 What is a negative impact on the environment caused by deforestation? A decrease in land for livestock production B decreased levels of carbon dioxide in the air C increase in flooding D increased levels of soil

1 marks

Answer: C

This question in 0970/12 Oct/Nov 2018

40 Which is a greenhouse gas? A herbicides B insecticides C methane D oxygen

1 marks

Answer: C

This question in 0970/12 Oct/Nov 2018

40 Large areas of tropical forests have been cleared to grow monocultures of palm oil plants. Which effect will this have on the ecosystem? A The use of fossil fuels in the area will decrease. B The use of pesticides in the area will decrease. C The variety of species in the area will decrease. D The variety of species in the area will increase.

1 marks

Answer: C

This question in 0970/11 May/June 2019

39 What are the possible effects of deforestation? decrease in atmospheric loss of soil flooding carbon dioxide A yes yes no B yes no yes C no yes no D no no yes

1 marks

Answer: A

This question in 0970/12 Oct/Nov 2019

40 The bloodworm is an organism that is found in heavily polluted water. The diagram shows where raw sewage flows into a river. Where would there be fewest bloodworms? input of raw sewage A D B C direction of flow

1 marks

Answer: A

This question in 0970/12 Oct/Nov 2019

39 Which is an example of an undesirable effect of deforestation? A decreased carbon dioxide concentration in the atmosphere B decreased soil erosion C increased flooding D the variety of organisms is maintained

1 marks

Answer: C

This question in 0970/11 May/June 2020

39 The diagram shows the results of a survey on the types of animals found along a stretch of river near to a factory. direction of water flow mayfly nymph stonefly nymph factory emptying pollutants into the water rat-tailed maggot bloodworm sludge worm leech bloodworm water louse snail shrimp caddisfly larva mayfly nymph stonefly nymph Which animal lives in the least polluted water? A bloodworm B caddisfly larva C leech D stonefly nymph

1 marks

Answer: D

This question in 0970/12 May/June 2020

39 Large areas of forest are cut down in order to clear the land for other uses. If the land is not replanted with trees or crops, what effect does this have on the atmosphere? A Carbon dioxide remains the same. B Carbon dioxide increases. C Oxygen increases. D Water vapour increases.

1 marks

Answer: B

This question in 0970/12 Oct/Nov 2020

40 The diagram shows four positions on a river where water samples were taken. untreated sewage X outlet direction of flow W Y Z Which graph shows oxygen concentrations in the river? A B oxygen oxygen concentration concentration W X Y Z W X Y Z position position C D oxygen oxygen concentration concentration W X Y Z W X Y Z position position

1 marks

Answer: C

This question in 0970/12 Oct/Nov 2020

40 Which factors are believed to have contributed to the rise in sea levels? A pollution of the air by carbon dioxide only B pollution of the air by carbon dioxide and methane C pollution of the sea by plastics only D pollution of the sea by insecticides and nuclear fall-out

1 marks

Answer: B

This question in 0970/11 May/June 2021

39 Corn that has been genetically engineered to be resistant to pests was developed in the 1990s. The graph shows the change in the percentage of corn grown that was genetically engineered and the change in the mass of chemical insecticides used. 0.3 100 0.25 80 0.2 percentage of insecticide 60 corn grown that use / kg per 0.15 was genetically hectare 40 0.1 engineered 0.05 20 0 0 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 year key insecticide use percentage of corn grown that was genetically engineered Which statement describes the data shown in the graph between 1996 and 2013? A The percentage of corn grown that was genetically engineered increased and the use of insecticides decreased. B The percentage of corn grown that was genetically engineered increased and the use of insecticides increased. C The percentage of corn grown that was genetically engineered decreased and the use of insecticides decreased. D The percentage of corn grown that was genetically engineered decreased and the use of insecticides increased.

1 marks

Answer: A

This question in 0970/12 Oct/Nov 2022

40 What could be undesirable effects of deforestation? 1 extinction of species 2 increased flooding 3 reduction of atmospheric carbon dioxide A 1 and 2 only B 1 and 3 only C 1, 2 and 3 D 2 and 3 only

1 marks

Answer: A

This question in 0970/12 Oct/Nov 2022

39 The bloodworm is an organism that is found in heavily polluted water. The diagram shows where raw sewage flows into a river. Where would there be fewest bloodworms? input of raw sewage A D B C direction of flow

1 marks

Answer: A

This question in 0970/11 May/June 2023

39 The diagram shows the results of a survey on the types of animals found along a stretch of river near to a factory. direction of water flow mayfly nymph stonefly nymph factory emptying pollutants into the water rat-tailed maggot bloodworm sludge worm leech bloodworm water louse snail shrimp caddisfly larva mayfly nymph stonefly nymph Which animal lives in the least polluted water? A bloodworm B caddisfly larva C leech D stonefly nymph

1 marks

Answer: D

This question in 0970/12 May/June 2023

38 What are the effects of sewage pollution on the biodiversity and the number of bacteria in a river? biodiversity number of bacteria A decreases decreases B decreases increases C increases decreases D increases increases

1 marks

Answer: B

This question in 0970/11 May/June 2024

39 The increase of which gases contributes to an enhanced greenhouse effect? A carbon dioxide and methane B methane and nitrogen C nitrogen and oxygen D oxygen and carbon dioxide

1 marks

Answer: A

This question in 0970/11 May/June 2024

38 Which change occurs when areas of forest are cleared for farming? A decreased release of carbon dioxide into the atmosphere B increased biodiversity C increased loss of soil D increased release of oxygen into the atmosphere

1 marks

Answer: C

This question in 0970/12 May/June 2024

37 The graph shows the percentage of species lost, in three different animal groups, due to different human activities during the last ten years. 100 80 key habitat loss 60 percentage of exploitation species lost 40 pollution other factors 20 0 mammals reptiles and birds amphibians animal group Which activity has caused the highest percentage of species loss overall? A habitat loss B exploitation C pollution D other factors

1 marks

Answer: A

This question in 0970/12 May/June 2025

38 Which statements describe the effects of deforestation? 1 Biodiversity increases. 2 The level of carbon dioxide in the atmosphere increases. 3 Soil is lost from the area. 4 There is a decrease in flooding. A 1 and 2 B 1 and 4 C 2 and 3 D 3 and 4

1 marks

Answer: C

This question in 0970/12 Oct/Nov 2025

39 Which substance is a greenhouse gas? A herbicide B insecticide C methane D oxygen

1 marks

Answer: C

This question in 0970/12 Oct/Nov 2025