Biology 0610 · IGCSE
Populations
87 practice questions on Populations, with worked solutions and instant marking.
In the exponential (log) stage of a sigmoid growth curve, which factor constrains population growth?
Feb/March 2017
Which factor will result in a reduction in population size?
Feb/March 2018
The graph illustrates how the human population of the world has changed over the last 2000 years. What phase is indicated by P?
Feb/March 2018
State one example of a population.
Feb/March 2021
The graph illustrates how the population of an organism changes over time in an ecosystem. Which row correctly names each phase of the population graph?
Feb/March 2021
What is the correct definition in ecology?
Feb/March 2024
Which action would reduce the population of an endangered animal species in a habitat?
Feb/March 2024
Pythons were introduced by accident to a region during the 1990s. After that, they bred in the wild and turned into a pest. The number of pythons taken out of the wild can be used as an indication of population size, as shown. Which phase of the population growth curve of pythons is shown in 2005?
Feb/March 2025
Which factors could lead to a rise in the size of a rabbit population?
Feb/March 2025
The graph illustrates a population growth curve. Which factors would make region X on the graph become steeper?
May/June 2016
In the food chain shown below, a viral disease reduces the snake population to half. grass $\rightarrow$ locusts $\rightarrow$ snakes $\rightarrow$ eagles What impact does this have on the other organisms in the food chain?
May/June 2016
Which one below is an example of a population?
May/June 2016
The graph illustrates how the world’s human population has grown since 1630. What was the greatest length of time needed for the population to double?
May/June 2016
A researcher examined how the population of fish increased for fish farming.
May/June 2016
Which one of these is an example of a population?
May/June 2017
The graph illustrates how the predator and prey populations vary over time. Which point on the graph indicates a fall in predator population?
May/June 2017
The graph shows how the populations of predator and prey change over time. Which point on the graph indicates a fall in predator population?
May/June 2017
The graph illustrates how the populations of predator and prey vary over time. Which point on the graph indicates a fall in predator population?
May/June 2017
Which of these counts as a population?
May/June 2017
The graph illustrates the changes in predator and prey populations over time. Which point on the graph indicates a fall in the predator population?
May/June 2017
The graph illustrates how the predator and prey populations vary over time. Which point on the graph indicates a reduction in predator population?
May/June 2017
The graph illustrates how the populations of predator and prey vary over time. Which point on the graph indicates a fall in predator population?
May/June 2017
The giant quiver tree, Aloe pillansii, in Fig. 5.1, is an endangered species. These trees live for a very long time and are adapted to severe conditions. Some populations of A. pillansii occur in Richtersveld National Park, whereas another population is located just beyond the park boundary on a mountain known as Cornell’s Kop in southern Africa.
May/June 2017
The graph illustrates how a brine shrimp population changes across a period of time. In which section or sections is the birth rate higher than the death rate?
May/June 2018
What does the term community mean?
May/June 2018
Which term refers to a collection of organisms of a single species that live in the same area at the same time?
May/June 2019
Rabbits are herbivores. Define what the term herbivore means.
May/June 2019
Describe the pattern of data in Fig. 6.1.
May/June 2019
Bacteria belong to the Prokaryote kingdom.
May/June 2019
What is one example of a population?
May/June 2021
Which of the following describes a population correctly?
May/June 2021
Fill in Table 7.1 by providing one example for each description.
May/June 2021
A herd of red deer lives in a forest that also has snakes and many different kinds of birds. Which group of organisms is an example of a population?
May/June 2022
A herd of red deer live in a forest that also contains snakes and many different types of birds. Which group of organisms is an example of a population?
May/June 2022
A group of red deer lives in a forest that also contains snakes and a wide range of birds. Which group of organisms is an example of a population?
May/June 2022
A group of red deer live in a forest where snakes are present and there is a wide range of birds. Which group of organisms is an example of a population?
May/June 2022
A herd of red deer lives in a forest that includes snakes and a wide range of birds. Which group of organisms is an example of a population?
May/June 2022
A herd of red deer inhabits a forest that includes snakes and a wide range of birds. Which group of organisms is an example of a population?
May/June 2022
Several yeast cells were introduced into a container holding nutrient solution. The graph illustrates how their population size changed with time. Which row indicates the phases numbered on the graph during which the reproduction rate was higher than the death rate?
May/June 2023
Some yeast cells were put into a container of nutrient solution. The graph illustrates how their population size varied with time. Which row indicates the phases on the graph during which the reproduction rate was higher than the death rate?
May/June 2023
Fusarium wilt is a fungal disease of bananas that can spread rapidly through a banana population. The table gives the area affected by Fusarium wilt over time in one country. What was the percentage increase in the area affected by Fusarium wilt from 1976 to 1999?
May/June 2024
Fig. 7.1 shows a flowchart of the stages involved in eutrophication.
May/June 2024
The graphs illustrate how many herbivores are present in a habitat over time. At time X, the carnivores are removed from the habitat. Which graph shows the effect of this on the number of herbivores?
May/June 2025
The diagram illustrates a population curve. Which letter indicates the lag phase on this sigmoid curve?
May/June 2025
The diagram presents a graph showing population growth. On which section of the graph is the population size restricted by the quantities of resources available?
May/June 2025
Which letter shows the lag phase on the population graph?
May/June 2025
The graph illustrates the number of water fleas in a recently formed pond. Which event could account for the graph’s shape at Y?
May/June 2025
At which stage of the population growth curve are death rates greater than birth rates?
May/June 2025
The graph illustrates the rise in the global human population. What factors have helped cause this rise?
Oct/Nov 2016
A herd of red deer lives in a woodland that also has snakes and many different birds. Which group of organisms counts as a population?
Oct/Nov 2016
Which statement explains how predation and disease affect a population?
Oct/Nov 2016
The graph illustrates the increase in a yeast population. At what point was the rate of cell death the same as the rate at which new cells were formed?
Oct/Nov 2016
Carp are fish. In Brazil, researchers recorded the body lengths of a carp population in a river in 1998 and then repeated the measurements in 2008. Their histograms are shown in Fig. 2.1.
Oct/Nov 2016
Which graph illustrates the growth of a population when there are no limiting factors?
Oct/Nov 2017
What term is used for ‘the combined populations of all the different species in an ecosystem’?
Oct/Nov 2017
Tasmania is an island situated off the southern coast of Australia. Sheep were brought to Tasmania in the nineteenth century. Fig. 3.1 displays the sheep population in Tasmania from 1820 to 1940. The dashed line indicates the population-growth trend.
Oct/Nov 2017
The graph displays a population growth curve for an insect species that has been reintroduced to an island after earlier becoming extinct there. How long after reintroduction does the insect population size begin to be limited by resources such as food?
Oct/Nov 2018
Over a ten-year span, the rabbit population in a woodland decreases to half its original size. Rabbits are herbivores. What might have led to this change?
Oct/Nov 2018
Elk are mammals, and they are herbivores. The graph shows the total number of elk in a national park from 1978 to 2008. What is one possible explanation for the change in the elk population between 1998 and 2000?
Oct/Nov 2018
The graph illustrates a curve for a bacteria population. During which phase on the graph is the number of bacteria dying the same as the number dividing?
Oct/Nov 2018
In 1991, only fourteen Daviesia cunderdin plants remained. What occurs to a plant population when it becomes very small?
Oct/Nov 2018
A student was provided with data showing how the number of insects in a population changed over a period of twelve weeks. The student had to identify and label each stage. What is the correct label for phase three?
Oct/Nov 2018
Which statement explains the effect of a disease that kills members of a population?
Oct/Nov 2019
Which combination of factors would lead to the largest decrease in the population growth of an animal species?
Oct/Nov 2021
The graph illustrates the growth curve of a bacteria population. The table labels each phase represented in the graph. Which row is the correct one?
Oct/Nov 2021
The graph illustrates the increase in a bacterial population. Which section shows the exponential (log) phase?
Oct/Nov 2021
The bar chart illustrates how tolerant some river organisms are to varying pH levels. Which organisms would be most affected if the pH of a river fell from pH $6.0$ to pH $5.5$?
Oct/Nov 2021
Define the term population by filling in the sentence.
Oct/Nov 2021
Which statement defines a population?
Oct/Nov 2022
Elk are mammals, and they are herbivores. The graph shows the total number of elk in a national park from 1978 to 2008. What is one possible explanation for the change in the elk population between 1978 and 1992?
Oct/Nov 2022
The graph illustrates how the population size of a microorganism in a fermenter changes over time. What is meant by the exponential phase?
Oct/Nov 2022
Give one example of a population.
Oct/Nov 2023
The graph illustrates how a rabbit population in one area increases. Which of these statements are correct?
Oct/Nov 2023
Draw one line to match each term with its description. Draw two lines.
Oct/Nov 2023
The graph illustrates the rise in the world’s human population since 1630. What was the greatest length of time needed for the population to double?
Oct/Nov 2024
The graph illustrates the increase in the world’s population over time. Which phase of the growth curve is shown by region P?
Oct/Nov 2024
The graph illustrates the yeast population over time. Which phase shows that the number of yeast cells dying is equal to the number of new yeast cells produced?
Oct/Nov 2024
What does the term population mean?
Oct/Nov 2024
The graph illustrates the rise in the population of a bird species after a conservation programme. What percentage increase occurred in the number of breeding pairs of birds from 1996 to 2002, rounded to the nearest whole number?
Oct/Nov 2024
Which statement accounts for the lag phase on a population graph?
Oct/Nov 2024
A group of fish belonging to one species was accidentally introduced into a lake.
Oct/Nov 2024
The graph illustrates the estimated increase in the human population. Which phase of population growth is taking place between the years 1600 and 2000?
Oct/Nov 2025
What is the correct order of the stages in a sigmoid population growth curve?
Oct/Nov 2025
The graph illustrates the increase in the world human population. Which phases of population growth does it show?
Oct/Nov 2025
The graph illustrates how population size changes with time. Which row names the phases of population growth?
Oct/Nov 2025
The graph displays a section of a growth curve for a bacterial population. What feature is missing from the graph?
Oct/Nov 2025
The graph illustrates the rise in the world’s population from 1650 to the present day. Which stages of a sigmoid curve for population growth do not appear on this graph?
Oct/Nov 2025