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

36 The population of rabbits in a woodland halves over a ten year period. Rabbits are herbivores. What could have caused this change? A an increased food supply B an increased light intensity C an increased number of predators D an increased water supply

1 marks

Answer: C

This question in 0970/12 Oct/Nov 2018

35 Which is an example of a population? A all the animals and plants living in a lake B all the different herbivores in a forest C all the mahogany trees growing in a forest D all the species of animals in Africa

1 marks

Answer: C

This question in 0970/12 May/June 2020

38 What is an example of a population? A all the arthropods in a pond B all the crocodiles in a river C all the plants in a wood D all the zebras that lived from 1990–2010

1 marks

Answer: B

This question in 0970/11 May/June 2021

38 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 0970/11 May/June 2022

38 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 0970/12 May/June 2022

38 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 A v Jv key B v v v/=yes Cc v x X =no D x v

1 marks

Answer: B

This question in 0970/11 May/June 2023

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

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

37 The graphs show the number of herbivores in a habitat over a period of time. At time X, the carnivores are removed from the habitat. Which graph shows the effect of this on the number of herbivores? A B number of number of herbivores herbivores X X time time C D number of number of herbivores herbivores X X time time

1 marks

Answer: A

This question in 0970/11 May/June 2025

36 The diagram shows a population curve. Which letter identifies the lag phase in this sigmoid curve? C D B number of individuals in a population A time

1 marks

Answer: A

This question in 0970/12 May/June 2025

33 In a greenhouse there were many aphids feeding on 10 tomato plants. A population of 20 ladybirds, which are a predator of aphids, was introduced into the greenhouse. Which pyramid of numbers correctly represents this food chain? A B C D

1 marks

Answer: C

This question in 0970/12 Oct/Nov 2025

35 What is the correct sequence for the stages in a sigmoid population growth curve? A lag  log  stationary B log  lag  stationary C stationary  lag  log D stationary  log  lag

1 marks

Answer: A

This question in 0970/12 Oct/Nov 2025

36 The graphs show the number of carnivores in a habitat over a period of time. At time X, the herbivores in the food chain are removed from the habitat. Which graph shows the likely effect of this on the number of carnivores? A B number of number of carnivores carnivores X X time time C D number of number of carnivores carnivores X X time time

1 marks

Answer: D

This question in 0970/12 Oct/Nov 2025