Populations — Paper 2 · IGCSE Biology (9-1) 0970

39 The statements describe some of the events that occur during eutrophication. What is directly responsible for the increase in bacteria? A a decrease in dissolved oxygen concentration B an increase in nitrate concentration C an increase in the population of algae D an increase in the death of producers

1 marks

Answer: D

This question in 0970/22 Oct/Nov 2018

37 Which term describes a group of organisms of one species, living in the same area, at the same time? A community B ecosystem C genus D population

1 marks

Answer: D

This question in 0970/21 May/June 2019

36 What is defined as ‘all of the populations of different species in an ecosystem’? A community B environment C habitat D trophic level

1 marks

Answer: A

This question in 0970/21 May/June 2020

36 What is defined as ‘all of the populations of different species in an ecosystem’? A community B environment C habitat D trophic level

1 marks

Answer: A

This question in 0970/22 May/June 2020

37 The diagram shows a population growth curve. 500 400 number of 300 individuals in the population 200 100 0 0 10 20 30 40 50 60 70 80 90 time / days How long does the population remain in the stationary phase? A 8 days B 12 days C 23 days D 48 days

1 marks

Answer: C

This question in 0970/22 Oct/Nov 2020

34 The graph shows the growth of a bacterial population. Which section represents the exponential (log) phase? C number of B bacteria D A time

1 marks

Answer: B

This question in 0970/22 Oct/Nov 2021

36 A herd of red deer live in a forest that contains snakes and a large variety of birds. Which group of organisms is an example of a population? A all the animals in the forest B all the red deer in the forest C all the organisms in the forest D all the plants in the forest

1 marks

Answer: B

This question in 0970/21 May/June 2022

40 The food web shows the feeding relationships in a woodland. sparrowhawks chaffinches grey wood squirrels pigeons caterpillars trees If all the chaffinches in the food web die, which effect would this have? A The amount of damage to trees will increase. B The food supply for grey squirrels will increase. C The number of wood pigeons will increase. D The population of caterpillars will decrease.

1 marks

Answer: A

This question in 0970/21 May/June 2022

36 A herd of red deer live in a forest that contains snakes and a large variety of birds. Which group of organisms is an example of a population? A all the animals in the forest B all the red deer in the forest C all the organisms in the forest D all the plants in the forest

1 marks

Answer: B

This question in 0970/22 May/June 2022

36 A few yeast cells were placed in a container of nutrient solution. The graph shows how their population size changed over time. population size time Which row shows when the reproduction rate was greater than the death rate for the numbered phases on the graph? reproduction rate greater than death rate 1 2 3 4 A v v v x B v v x x Cc v x x x D x v v v key v= yes xX =no

1 marks

Answer: B

This question in 0970/21 May/June 2023

36 What is a population? A a group of different organisms living in different areas at the same time B a group of organisms of different species living in the same area C a group of organisms of one species living in the same area at different times D a group of organisms of one species living in the same area at the same time

1 marks

Answer: D

This question in 0970/22 Oct/Nov 2024

38 The graph shows how the population of a species of bird has increased following a conservation programme. 400 350 300 250 number of breeding pairs 200 of birds 150 100 50 0 1990 1992 1994 1996 1998 2000 2002 2004 year What is the percentage increase in the number of breeding pairs of birds from 1996 to 2002, to the nearest whole number? A 35% B 74% C 170% D 283%

1 marks

Answer: D

This question in 0970/22 Oct/Nov 2024

37 Which letter represents the lag phase in the population graph shown? A B C D number of individuals in the population time

1 marks

Answer: A

This question in 0970/21 May/June 2025

38 Which term describes the number of different species living in an area? A biodiversity B conservation C ecosystem D population

1 marks

Answer: A

This question in 0970/21 May/June 2025

38 The graph shows the number of water fleas in a newly-created pond. Y number of water fleas time Which event could be responsible for the shape of the graph at Y? A the addition of extra oxygenating plants to the pond B an increase in the birth rate of the water fleas C an increase in the food supply for the water fleas D the addition of predators which feed on water fleas

1 marks

Answer: D

This question in 0970/22 May/June 2025

37 The graph shows part of a growth curve for a bacterial population. population size time What is not shown in the graph? A the death phase B the exponential phase C the lag phase D the stationary phase

1 marks

Answer: A

This question in 0970/22 Oct/Nov 2025