| Date | May 2011 | Marks available | 1 | Reference code | 11M.1.SL.TZ1.20 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 20 | Adapted from | N/A |
Question
Which of the following is the best definition of a population?
A. A group of individuals that can interbreed and produce fertile offspring
B. The number of individuals of the same species in a given area
C. A group of species living and interacting with each other in a given area
D. The total number of individuals in a given area
Markscheme
B
Examiners report
This did not discriminate very well, with quite a number of candidates choosing C (a community) instead of B (a population). It was thought that this may be language difficulty for ESL students, and also the definitions are often associated with a time factor.
Syllabus sections
Show 99 related questions
- 17N.1.SL.TZ0.17: In an area of forest measuring 100 m by 100 m, samples were taken to estimate the number of...
- 17M.3.HL.TZ1.3b: Mesocosm experiments using water from Narragansett Bay were completed in the laboratory...
- 17M.2.HL.TZ2.4a.ii: Using the food web, identify a saprotroph.
- 17M.2.HL.TZ2.4a.i: Using the food web, identify a detritivore.
- 17M.2.HL.TZ1.4b: Most of the surface of the Earth is covered with a wide diversity of ecosystems. Outline two...
- 17M.2.HL.TZ1.1f.ii: Suggest a reason for the greater expression of the gene for the urea transporter after an...
- 17M.2.SL.TZ1.1c: Estimate how much smaller drilled oysters raised in seawater at a high CO2 concentration were...
- 17M.1.HL.TZ2.22: The image shows a transect through a stream and a field. Which calculation would test for...
- 17M.1.SL.TZ2.27: The bacterium Neisseria gonorrhoeae causes infections related to the human reproductive...
- 17M.1.SL.TZ1.21: Cladograms can be created by comparing DNA or protein sequences. The cladogram on the left is...
- 16M.3.HL.TZ0.1b: Suggest one advantage of using a mesocosm in this experiment.
- 16M.3.SL.TZ0.3b: Distinguish between the exchange of matter and energy with the surroundings in a closed...
- 16N.2.HL.TZ0.1i: Discuss the need for international cooperation to solve the problems of declining coral...
- 16N.2.SL.TZ0.4c: Discuss whether or not horses and donkeys should be placed in the same species.
- 16N.2.SL.TZ0.1g: The North American beaver (Castor canadensis) was introduced to islands adjacent to Argentina...
- 16N.2.SL.TZ0.1d: Analyse the data to find the effect of flooding and tree felling by beavers on the activity...
- 16N.2.SL.TZ0.1c: The graph shows the mean dry mass of mayflies relative to the water temperature in their...
- 16N.2.SL.TZ0.1b: Describe the effect dams have on water temperature.
- 16N.2.SL.TZ0.1a: Calculate the difference in the mean dry mass of mayflies upstream and downstream of Cement...
- 16N.1.SL.TZ0.17: What is the classification of an organism that is able to make organic compounds from...
- 16M.1.HL.TZ0.23: Which are characteristics of a species? I. The potential to interbreed to produce fertile...
- 15M.1.SL.TZ2.17: Which statement describes the term species?A. Members of the same ecological communityB....
- 15M.2.SL.TZ2.1e: Besides farmland, identify which two ecosystems have the greatest total area with a high...
- 15M.2.SL.TZ2.1f: Predict with a reason, using the data, which district has most farmland.
- 15M.2.SL.TZ2.3c: State one reason that the population of mountain lions is smaller than the populations of...
- 15M.2.HL.TZ2.1f: Discuss the use of Adélie penguins in studying the effects of global warming.
- 15M.2.HL.TZ2.1d: Describe the trends in the length of the sea ice season around the Antarctic Peninsula and in...
- 15M.2.HL.TZ2.1e: Analyse the trends in colony size of the Adélie penguins in relation to the changes in the...
- 15M.2.SL.TZ2.1g: Discuss whether malaria could be reduced by replacing farmland with natural ecosystems and...
- 15M.1.HL.TZ2.16: The image shows an Arctic food web. What is the role of the Arctic hare? A. DetritivoreB....
- 15M.3.SL.TZ1.20c: Outline the abiotic factors that affect the distribution of plant species in an ecosystem.
- 15N.1.SL.TZ0.1: Two populations of the same fish species were fed different diets to investigate the effect...
- 15N.1.SL.TZ0.18: Which of the following describe(s) this spider? I. Primary consumer II. Heterotroph III....
- 15N.1.SL.TZ0.19: Based on their diet, the feces of spotted hyenas appear white because of high calcium...
- 15N.1.HL.TZ0.1: Two populations of the same fish species were fed different diets to investigate the effect...
- 15N.2.SL.TZ0.2d(ii): State one role of saprotrophic organisms in the ecosystem.
- 15N.1.HL.TZ0.15: Which of the following describe(s) this spider? I. Primary consumer II. Heterotroph III....
- 15N.2.SL.TZ0.2d(i): Saprotrophic organisms, such as Mucor species, are abundant in soils. Define saprotrophic...
- 13M.2.HL.TZ1.4a: Distinguish between autotrophs and heterotrophs.
- 13M.1.HL.TZ1.16: In ecosystems the amount of energy that passes from one trophic level to the next is called...
- 13N.1.SL.TZ0.17: What is a population?A. Organisms of the same genus living in an ecosystemB. Organisms living...
- 13N.1.SL.TZ0.18: Which pair of statements is correct?
- 13M.1.SL.TZ1.19: What is an ecosystem? A. An environment in which an organism normally livesB. A group of...
- 13M.1.SL.TZ2.18: What term can be used to describe clams that eat decaying plant matter? A. DetritivoresB....
- 13M.3.SL.TZ2.12c: Discuss the definition of the term species.
- 11M.1.HL.TZ1.16: What is a community composed of? A. Habitats B. Populations C. Abiotic factors D. Biotic...
- 11M.3.HL.TZ1.10e: Allochthonous organisms are those which have migrated from one place to another, such as the...
- 11M.3.HL.TZ1.10a: State the mean terrestrial invertebrate biomass measured in August.
- 11M.3.HL.TZ1.10c: Suggest the relationship between defoliation and the amount of terrestrial invertebrates in...
- 11M.3.HL.TZ1.10b: Describe the trend in the aquatic invertebrate flux.
- 11M.3.HL.TZ1.10d: Suggest a possible explanation for the pattern in aquatic invertebrate flux to the forest...
- 11M.1.SL.TZ2.21: Which of the following ecological units includes abiotic factors? A. A community B. An...
- 11M.3.SL.TZ1.19d: Suggest a possible explanation for the pattern in aquatic invertebrate flux to the forest...
- 11M.3.SL.TZ1.19a: State the mean terrestrial invertebrate biomass measured in August.
- 11M.3.SL.TZ1.19c: Suggest the relationship between defoliation and the amount of terrestrial invertebrates in...
- 11M.3.SL.TZ1.19b: Describe the trend in the aquatic invertebrate flux.
- 12M.2.HL.TZ1.1f: Suggest one reason for the high LCTw measured for the female dolphin.
- 12M.2.HL.TZ1.1g: Evaluate the hypothesis that water temperature determines the range and distribution of...
- 12M.2.HL.TZ1.1h: Explain how an increase in water temperature due to global warming could affect the...
- 12M.2.HL.TZ1.1b: Calculate the mean number of dolphins counted per survey for the winter season.
- 12M.2.HL.TZ1.1c: Compare the data for the dolphin populations in winter and summer.
- 12M.2.HL.TZ1.1a: State the largest number of dolphins counted in a single survey.
- 12M.2.HL.TZ1.1d (i): Compare the distribution of dolphins in summer and winter.
- 12M.2.HL.TZ1.1d (ii): Suggest one reason for the differences in distribution.
- 12M.2.HL.TZ1.1e: Outline the relationship between body mass and LCTw for male dolphins.
- 12M.1.HL.TZ1.14: In a pond, two species of fish feed on insects and worms. The insects feed on the green...
- 12M.1.HL.TZ1.15: The fungus Calocera viscosa obtains its nutrients from decaying conifer trees. Which pair of...
- 12M.1.HL.TZ2.15: What best describes the mode of nutrition of a heterotroph? A. It ingests only non-living...
- 12M.2.SL.TZ1.1b: Compare the distribution of dolphins in summer and winter.
- 12M.2.SL.TZ1.1c: Suggest one reason for the differences in distribution.
- 12M.1.SL.TZ2.17: What best describes the mode of nutrition of a heterotroph? A. It ingests only non-living...
- 12M.1.SL.TZ1.18: In a pond, two species of fish feed on insects and worms. The insects feed on the green...
- 12M.1.SL.TZ2.21: What term refers to organisms of the same species, living in a specified area and time? A....
- 12M.2.SL.TZ1.1a: State the largest number of dolphins counted in a single summer survey.
- 09M.1.HL.TZ1.15: Slime moulds (Acrasiomycota) are protoctists. They feed on decaying organic matter, bacteria...
- 09M.2.SL.TZ2.4a: Define the terms species, population and community. Species: Population: Community:
- 10M.2.HL.TZ2.1b: Using the data from the table, calculate the percentage difference in mean bird mass for the...
- 10M.2.HL.TZ2.1h: Suggest one advantage and one disadvantage for blood sampling rather than weighing birds to...
- 10M.2.HL.TZ2.1a: Considering all the birds sampled, identify which species was sampled the most and which was...
- 10M.2.HL.TZ2.1c: Compare the 17-year summary data for the hermit thrush and the magnolia warbler.
- 10M.2.HL.TZ2.1d: Evaluate the one season data for the hermit thrush and the American robin with regard to...
- 10M.2.HL.TZ2.1e: Describe, using the triglyceride levels graph, the results at Site 1 and Site 2 for all of...
- 10M.2.HL.TZ2.1g: Scientists have hypothesized that the food quality is better at Site 1 than at Site 2....
- 10M.2.HL.TZ2.1f: Explain the differences in the triglyceride level and butyrate level for the hermit thrush at...
- 10M.1.SL.TZ1.18: What is a community? A. A group of organisms living and interacting in the same trophic...
- 10M.2.SL.TZ1.1a: Outline the trends, over the period of time shown in the graph, in the number of grey...
- 10M.2.SL.TZ1.1b (i): Identify the correlation between the density of grey partridges and birds of prey.
- 10M.2.SL.TZ1.1b (ii): Suggest a hypothesis to account for this correlation.
- 10M.2.SL.TZ1.1c (i): Calculate the percentage of deaths due to birds of prey.
- 10M.2.SL.TZ1.1c (ii): Using the data provided, discuss the causes of the correlation between the density of grey...
- 10M.2.SL.TZ2.1b: Discuss the relationship between sampling visits (V) and puddling time (T) in experiments 1,...
- 10M.2.SL.TZ2.1a: Identify the dissolved element always present in the three samples with most puddling time.
- 10M.2.SL.TZ2.1c: Analyse the results for experiment 4.
- 09N.1.SL.TZ0.17: Zoophobas morio is an insect. Its larvae feed on bat feces in caves in Guatemala. What type...
- 11N.1.HL.TZ0.22: Which term best defines a group of populations living and interacting with each other in an...
- 11N.1.SL.TZ0.20: Which of the following trophic groups include fungi? A. Detritivores B. Autotrophs C....
- 12N.1.HL.TZ0.15: What is the mode of nutrition of midge larva? A. AutotrophB. DetritivoreC. HeterotrophD....
- 12N.1.HL.TZ0.16: Which represents a correct food chain from this web? A. stickleback → midge larva →...
- 12N.2.SL.TZ0.6a: Define habitat, population, community and ecosystem.
