Population growth and distribution

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Apuntes de la lección

What is Population?

A population is the set of people living in a particular geographic area, such as a settlement, country, region, city, or the whole world.
In human biology, a population can be defined more precisely as a group of individuals who are more likely to mate among themselves than with others.
A larger geographic population can be made up of smaller breeding populations that coexist together.
Demography is the statistical study of human populations, including their size, structure, and distribution.
Demographers count individuals by certain criteria at a given time in a specific region, unlike biologists who study numbers over time under varying conditions.

World Population Growth Over Time

The human population has increased or decreased in size over time, but in recent centuries it has grown rapidly.
Population growth is influenced by birth rate (the number of live births per 1,000 people per year) and death rate (the number of deaths per 1,000 people per year).
Natural increase occurs when the birth rate is higher than the death rate, leading to population growth.
Natural decrease occurs when the death rate is higher than the birth rate, leading to population decline.
Technological factors, especially medicine, have improved overall health and lowered mortality rates, contributing to population growth.

The Demographic Transition Model

The Demographic Transition Model (DTM) shows how population changes over time as a country develops.
It has five stages: high fluctuating, early expanding, late expanding, low fluctuating, and decline.
In Stage 1, both birth and death rates are high, so population remains low and stable.
In Stage 2, death rates fall while birth rates remain high, causing rapid population growth.
In Stage 3, birth rates begin to fall, slowing population growth.
In Stage 4, both birth and death rates are low, so population is stable and high.
In Stage 5, birth rates fall below death rates, leading to population decline and an ageing population.

Population Pyramids

A population pyramid is a graph that shows the age and sex distribution of a population.
The shape of a population pyramid indicates whether a population is youthful, ageing, or stable.
A wide base and narrow top indicate a youthful population with high birth rates and lower life expectancy.
A narrow base and wider top indicate an ageing population with low birth rates and higher life expectancy.
Population pyramids help governments plan for services like schools, healthcare, and pensions.

Population Density and Distribution

Population density is the number of people living per square kilometre.
Population distribution describes how people are spread across an area.
Physical factors affecting distribution include relief (shape of the land), climate, soil, and water supply.
Human factors affecting distribution include economic opportunities, transport, government policies, and social factors.
Most people live in areas with fertile land, mild climate, and good access to resources and jobs.

Overpopulation and Underpopulation

Overpopulation occurs when the number of people exceeds the carrying capacity of the environment, leading to resource shortages.
Underpopulation occurs when there are too few people to fully use the available resources, leading to inefficiency.
Both over- and underpopulation can cause economic and social problems.
Governments may try to manage population size through policies that encourage or discourage having children.

Ageing and Youthful Populations

An ageing population has a high proportion of older people, often due to low birth rates and high life expectancy.
Ageing populations can lead to labour shortages and increased pressure on healthcare and pensions.
A youthful population has a high proportion of young people, often due to high birth rates.
Youthful populations require more schools and childcare, but can provide a large future workforce.
Governments may introduce policies to address the challenges of ageing or youthful populations.

Government Population Policies

Governments may use policies to influence population growth, such as China's one-child policy (1979–2015).
The one-child policy aimed to reduce population growth by limiting most families to one child.
It led to a decrease in birth rates but also caused issues like an ageing population and gender imbalance.
Other policies may encourage larger families, such as providing financial incentives or childcare support.
Population policies can have long-term social and economic impacts.

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Preguntas de práctica

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1.The word 'population' comes from the Latin word 'populus'. What does 'populus' mean?
Easy
- APeople
- BPlace
- CGrowth
- DNumber
2.In which century is the first known usage of the term 'population' dated?
Easy
- AThe 1200s
- BThe 1500s
- CThe 1800s
- DThe 1900s
3.Which person is credited with being the first to use the word 'population' in its modern sense?
Easy
- AFrancis Bacon
- BCharles Darwin
- CThomas Malthus
- DIsaac Newton
4.Which subject is defined as the statistical study of human populations?
Easy
- ADemography
- BGenetics
- CEcology
- DAnthropology
5.Which statement best describes how demographers and biologists use the term 'population' differently?
Medium
- ABiologists count individuals by set criteria at a given time in a region, while demographers study interbreeding groups.
- BDemographers count individuals by certain criteria at a given time in a specific region, while biologists study the number of individuals in an area and how it changes over time under varying conditions.
- CDemographers study only the whole world, while biologists study only single settlements.
- DBiologists use the term only for humans, while demographers use it only for animals.
6.In biology, which definition best describes a population?
Medium
- AAll the people living in one country at a given time.
- BMembers of a species that can interbreed with each other and are geographically isolated from other populations of the same species.
- CA group of people who share the same eye colour.
- DEvery organism living in one habitat, including different species.
7.Which three main factors limit the size of a population in humans and other animals?
Medium
- AAvailable food sources, diseases and the environment
- BMigration, education and religion
- CMedicine, technology and culture
- DBirth rate, death rate and natural increase
8.Which statement about the human genome across all human populations is correct?
Medium
- A99.9% of the human genome remains the same across all human populations.
- BAbout half of the human genome is the same across all human populations.
- CNo part of the human genome is shared across all human populations.
- DAll human populations have identical gene pools.

Más preguntas

9.Which of the following are given as factors that can limit mating between human populations coexisting on the same territory? (select all that apply)
Medium
- AEthnicity
- BEducation level
- CSocial status
- DReligion
- EEye colour
10.Humans differ from other animals in that cultural, social and technological factors influence their reproduction and population growth.
Easy
True or false?
11.Human races are considered populations by biologists because races are defined by physical characteristics.
Easy
True or false?
12.Which of the following is an example of how technology has affected human population growth?
Medium
- AMedicine has improved overall health and lowered the mortality rate.
- BDiseases have become more common in all populations.
- CFood sources have been reduced by cultural factors.
- DMigration has stopped between countries.
13.A geographer studies the age and sex distribution of a country's population. Which area of demography does this describe?
Medium
- APopulation structure
- BPopulation dynamics
- CPopulation genetics
- DPopulation density
14.Which statement about nations and populations is correct?
Medium
- AEvery nation contains exactly one population.
- BNations and populations may overlap, but their boundaries can be different.
- CPopulations always match national borders exactly.
- DA population cannot exist without a nation.
15.Which of the following are counted as demographic statistics? (select all that apply)
Medium
- AAge and sex distribution
- BSpatial distribution of a population
- CPopulation size
- DChanges in the size and age of a population
- EThe eye colour of one individual
16.Match each term to its correct definition.
Medium
- Demography
- Population structure
- Population dynamics
- Population genetics
- The statistical study of human populations
- The age and sex distribution of a population
- The change in the size and age of a population
- The study of differences between and inside populations
17.Put these stages in the correct order to describe how the term 'population' developed over time.
Medium
- The Latin word 'populus' is used for the citizens of a specific place
- The word is used as a verbal noun describing a process or state, such as an increase of inhabitants
- This verbal-noun definition becomes archaic
- Francis Bacon uses the word in its modern sense
18.Which term describes the statistical study of human populations?
Easy
- ADemography
- BPopulation genetics
- CBiological anthropology
- DHuman ecology
19.In biology, what does the term 'population' usually describe?
Easy
- AMembers of a species that can interbreed with each other and are geographically isolated from other populations of the same species
- BAll the people living in a country at a given time
- CA group of people defined by a single physical characteristic such as eye colour
- DThe total number of births in a region each year
20.A demographer counts individuals using specific criteria at a given time in a specific region. Which statement best describes how this differs from the biologist's approach?
Medium
- ABiologists study the number of individuals in an area and how it changes over time under varying conditions
- BBiologists count individuals only by age and sex
- CBiologists are only interested in human populations
- DBiologists study only the spatial distribution of people
21.Which of the following are examples of demographic statistics? (select all that apply)
Medium
- AAge and sex distribution of a population
- BSpatial distribution of a population
- CSize of a population
- DThe gene pool of a species
- EThe phenotypic traits of individuals
22.Which of the following are factors that can limit mating between human populations coexisting on the same territory? (select all that apply)
Medium
- AEthnicity
- BEducation level
- CSocial status
- DReligion
- EEye colour
23.Population genetics studies both the differences between populations and the differences inside a population.
Easy
True or false?
24.Biologists typically use physical characteristics such as eye colour to define a human population.
Easy
True or false?
25.Put these historical developments in the correct chronological order.
Medium
- First known usage of the term 'population'
- Francis Bacon uses 'population' in its modern sense
- Modern global migration and transportation reduce boundaries between populations
26.Which of the following best describes how demographers differ from biologists in their approach to studying populations?
Medium
- ADemographers count individuals by certain criteria at a given time in a specific region, while biologists study the number of individuals in a particular area and its evolution over time under varying conditions.
- BDemographers study the number of individuals in a particular area and its evolution over time under varying conditions, while biologists count individuals by certain criteria at a given time in a specific region.
- CDemographers focus on genetic differences between populations, while biologists focus on the statistical study of human populations.
- DDemographers study only human populations, while biologists study only non-human animal populations.
27.Which of the following is a consequence of modern global migration and transportation on human populations?
Medium
- AIt increases the boundaries between populations, making them more distinct.
- BIt reduces the boundaries between populations, making them less distinct.
- CIt has no effect on the boundaries between populations.
- DIt causes populations to become geographically isolated from each other.
28.Which of the following is an example of a technological factor that has influenced human population growth?
Medium
- AImproved medicine lowering the mortality rate
- BIncreased food sources due to agriculture
- CCultural taboos on mating between different groups
- DReligious beliefs encouraging larger families
29.Which of the following statements about human populations is correct?
Medium
- AA single geographic area can contain only one human population.
- BMultiple human populations can coexist on the same territory because mating between them may be limited by factors such as ethnicity, education level, social status, and religion.
- CHuman populations are always defined by physical characteristics such as eye colour.
- DNations and populations always have exactly the same boundaries.
30.Which of the following factors can limit mating between human populations coexisting on the same territory? (select all that apply)
Medium
- AEthnicity
- BEducation level
- CSocial status
- DReligion
- EEye colour
31.Which of the following are ways in which humans differ from other animals in terms of population growth? (select all that apply)
Medium
- ACultural factors influence reproduction and population growth.
- BSocial factors influence reproduction and population growth.
- CTechnological factors influence reproduction and population growth.
- DAvailable food sources limit population size.
- EDiseases limit population size.
32.Nations and populations may overlap, but their boundaries can be different.
Medium
True or false?
33.A demographer describes a study group as 'the female population over 60 years of age'. Which two additional criteria have been used to define this subpopulation?
Medium
- ASex and age
- BEthnicity and religion
- CIncome and education level
- DNationality and language
34.A study reports that 99.9% of the human genome is the same across all human populations. What does this evidence suggest?
Medium
- AOnly a very small share of human genetic material varies between populations
- BHuman populations are entirely identical genetically
- CPhysical traits are the best way to define a population
- DPopulations cannot be separated by geographic area
35.A geographer records the age and sex structure, the spatial distribution and the total size of a country's population. Which term describes this kind of statistical study of human populations?
Medium
- ADemography
- BPopulation genetics
- CEcology
- DBiological anthropology
36.Demographers and biologists use the term 'population' in exactly the same way, with no differences between their definitions.
Easy
True or false?
37.A student argues that because all humans belong to the same species (Homo sapiens) and can interbreed, there is really only one human population. Which statement best challenges this argument?
Medium
- AHumans represent different populations separated geographically, although modern migration and transport reduce these boundaries
- BHumans cannot interbreed at all, so separate populations are inevitable
- CRaces are the only valid way to divide humans into populations
- DPhysical characteristics prove that human populations are completely isolated from each other
38.A local health authority records the number of deaths per 1,000 people in a town during one year. Which demographic measure is being recorded?
Medium
- ADeath rate
- BBirth rate
- CNatural increase
- DPopulation density
39.A council wants to compare two neighbouring districts. Which of the following pieces of information are demographic statistics that could be used? (select all that apply)
Medium
- AAge and sex distribution of residents
- BSpatial distribution of residents across the district
- CThe average winter temperature of the district
- DTotal size of the population
- EThe colour of the town hall roof
40.Match each term to the statement that best describes it.
Medium
- Population (biology)
- Demography
- Population genetics
- Natural increase
- Members of a species that can interbreed and are geographically isolated from other populations of the same species
- The statistical study of human populations
- The study of differences between populations and differences inside a population
- The difference between birth rate and death rate in a population
41.Give the Latin word meaning 'people', from which the word 'population' evolved.
Easy
42.Complete the sentence about the definition of a population in biology.
Medium
In biology, a population usually describes members of a ____ that can ____ with each other and are geographically ____ from other populations of the same species.
43.Complete the sentence about what limits population size.
Easy
There are three main factors that limit the size of a population in humans and other animals: available ____ sources, ____ and the ____.
44.What percentage of the human genome remains the same across all human populations?
Medium
45.What is the term for the statistical study of human populations?
Easy
46.According to the source, what percentage of the human genome remains the same across all human populations?
Medium
47.Complete the sentence about population definitions in biology.
Medium
In biology, the term 'population' usually describes members of a species that can ____ with each other and are ____ isolated from the other populations of the same species.
48.Complete the sentence about factors that limit population size.
Medium
There are three main factors that limit the size of a population in humans and other animals: available ____, ____ and the ____.
49.Which word means 'the statistical study of human populations'?
Easy
50.What is the name of the Latin word meaning 'people' from which 'population' evolved?
Easy
51.According to the reference material, what percentage of the human genome remains the same across all human populations?
Easy
52.In which century is the first known usage of the term 'population' dated? Give the century as a number (for example, for the 1500s enter 16).
Easy
53.Explain why modern global migration and transportation affect the boundaries between human populations.
Hard
54.Explain why physical characteristics such as eye colour are not typically used by biologists to define a population.
Hard
55.Explain why biologists do not usually define a human population using a single physical characteristic such as eye colour.
Hard
56.What percentage of the human genome remains the same across all human populations?
Medium
- A99.9 %
- B119.9 %
- C109.9 %
- D89.9 %
57.According to the source, what percentage of the human genome remains the same across all human populations?
Medium
- A119.9 %
- B109.9 %
- C89.9 %
- D99.9 %
58.According to the reference material, what percentage of the human genome remains the same across all human populations?
Easy
- A99.9 %
- B109.9 %
- C119.9 %
- D89.9 %
59.In which century is the first known usage of the term 'population' dated? Give the century as a number (for example, for the 1500s enter 16).
Easy
- A16 century
- B18 century
- C17 century
- D15 century

Apuntes de repaso

## Population Growth and Distribution **Population** = the set of people living in a particular geographic area. A population can be a settlement, a country, a region, or the whole world. All humans belong to the same species (*Homo sapiens*) and can interbreed, but they form different populations separated geographically. Modern migration and transport reduce these boundaries. ### How populations grow - **Birth rate** – number of live births per 1,000 people per year. - **Death rate** – number of deaths per 1,000 people per year. - **Natural increase** = birth rate − death rate. If positive, the population grows naturally; if negative, it declines. - **Population growth** over time is also affected by **migration** (people moving in or out). ### Demographic transition model (DTM) The DTM shows how birth and death rates change as a country develops: 1. **Stage 1** – high birth rate, high death rate → stable, small population. 2. **Stage 2** – death rate falls (better medicine, food, sanitation), birth rate stays high → rapid growth. 3. **Stage 3** – birth rate falls (urbanisation, education, contraception), death rate low → growth slows. 4. **Stage 4** – low birth rate, low death rate → stable, ageing population. 5. **Stage 5** (some models) – birth rate below death rate → population decline. ### Population pyramids - **Wide base, narrow top** – youthful population: high birth rate, many children, shorter life expectancy. - **Narrow base, wide top** – ageing population: low birth rate, long life expectancy. ### Density and distribution - **Population density** = number of people ÷ area (usually people per km²). - **Distribution** = how people are spread across an area. - Factors affecting distribution: **physical** (relief, climate, water, soil, resources) and **human** (jobs, transport, services, government policies). ### Over- and under-population - **Over-population** – when the population is too large for the available resources, leading to shortages and a lower quality of life. - **Under-population** – when there are too few people to use the resources and workforce effectively. ### Ageing and youthful populations - **Ageing population** – high proportion of older people; pressures on healthcare and pensions; may need policies to encourage births or immigration. - **Youthful population** – high proportion of children; pressures on schools and jobs; may need family planning or education policies. - **China's one-child policy** (1979–2015) aimed to slow rapid growth by limiting most families to one child. It reduced the birth rate but led to an ageing population and a shortage of young workers. ### Key skills - Interpret population pyramids and DTM graphs. - Calculate natural increase and population density. - Explain how physical and human factors affect where people live. ### Key terms - **Demography** – the statistical study of human populations. - **Birth rate** – live births per 1,000 people per year. - **Death rate** – deaths per 1,000 people per year. - **Natural increase** – birth rate minus death rate. - **Population density** – number of people per square kilometre. - **Population distribution** – how people are spread across an area. - **Demographic transition model** – a model showing changes in birth and death rates as a country develops. - **Population pyramid** – a graph showing the age and sex structure of a population. - **Over-population** – when there are too many people for the available resources. - **Under-population** – when there are too few people to make full use of resources. - **Ageing population** – a population with a high proportion of older people. - **Youthful population** – a population with a high proportion of children and young people.

Population: The set of people living in a particular geographic area, such as a settlement, country, region, or the whole world.
Demography: The statistical study of human populations.
Birth rate: The number of live births per 1,000 people per year.
Death rate: The number of deaths per 1,000 people per year.
Natural increase: The birth rate minus the death rate; a positive figure means the population grows naturally.
Demographic transition model: A model showing how birth and death rates change as a country develops, with stages from high to low rates.
Population pyramid: A graph showing the age and sex structure of a population.
Population density: The number of people per square kilometre.
Population distribution: How people are spread across an area.
Over-population: When the population is too large for the available resources, leading to shortages and a lower quality of life.
Under-population: When there are too few people to use the resources and workforce effectively.
Ageing population: A population with a high proportion of older people, often due to low birth rates and long life expectancy.
Youthful population: A population with a high proportion of children and young people, often due to high birth rates.
One-child policy: A policy in China (1979–2015) that limited most families to one child to slow rapid population growth.

Tarjetas

What is a human population?

The set of people living in a particular geographic area, which can be a settlement, city, region, country or the whole world. Its size increases or decreases over time.

How do biologists define a population more precisely?

As a group of individuals who are more likely to mate among themselves than with others, influenced by social and cultural factors.

Why can several human populations coexist in the same territory?

Mating between them may be limited by factors such as ethnicity, education level, social status and religion.

What is demography?

The statistical study of human populations, including their structure, spatial distribution, size and how these change over time.

What does 'population structure' mean in demography?

The makeup of a population, such as its age and sex distribution.

What is population dynamics?

The change over time in the size and age of a population.

Where does the word 'population' come from?

It evolved from the Latin word 'populus', meaning 'people', originally used for citizens of a specific place. The first known usage dates to the 1500s.

What proportion of the human genome is the same across all human populations?

99.9% of the human genome remains the same across all human populations; the remaining genes can differ.

Why are physical characteristics not used by biologists to define a population?

Grouping people by one physical trait does not make them similar in other traits, so a single individual would belong to numerous groups.

Why are human races not considered populations?

Races can include smaller populations, and definitions of some races were originally based on physical characteristics.

What three main factors limit population size in humans and other animals?

Available food sources, diseases and the environment.

How do humans differ from other animals in what affects their population growth?

Humans have cultural, social and technological factors that influence reproduction and population growth.

Give one technological factor that has affected human population growth.

Medicine has improved overall health and lowered the mortality (death) rate.

What is meant by the distribution of a population?

The way people are spread across a geographic area, from a single settlement to the whole world.

What is population density?

A measure of how many people live in a given area, usually expressed as people per square kilometre.

What is the birth rate?

The number of live births per 1,000 people in a population in a given year.

What is the death rate?

The number of deaths per 1,000 people in a population in a given year.

What is natural increase?

The change in population size when the birth rate is higher than the death rate, without counting migration.

What does the demographic transition model show?

How birth rates and death rates change over time as a country develops, and how this affects population growth.

What does a population pyramid show?

The age and sex structure of a population, with age groups on the vertical axis and numbers or percentages on the horizontal axis.

What is an ageing population?

A population with a rising proportion of older people, often caused by low birth rates and longer life expectancy.

What is a youthful population?

A population with a high proportion of children and young people, usually caused by high birth rates.

What is over-population?

When a population is too large for the resources available in its area, so people cannot be supported properly.

What is under-population?

When a population is too small to make full use of the resources available in its area.

What was China's one-child policy?

A government policy that limited most families to one child in order to slow population growth.

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