Population -- Diagnostic Tests

DSE Geography Diagnostic: Population

Unit Test 1: Population Pyramids and Structure

Question

(a) Describe the key features of a population pyramid for a Stage 2 country in the Demographic Transition Model. Explain how the pyramid shape reflects the demographic characteristics of that stage. [4 marks]

(b) The population pyramid of Country A (a developed country) shows a larger proportion of elderly people (aged 65+) compared to children (aged 0-14). State two consequences of an ageing population for the economy and society of Country A. [4 marks]

(c) A population pyramid of Country B shows a bulge in the 25-40 age group with relatively few dependents at both ends. Suggest two possible causes for this unusual population structure. [2 marks]

Worked Solution

(a) A Stage 2 population pyramid has a wide base reflecting a high birth rate (many children aged 0-14), and a pyramid that narrows rapidly towards the apex, reflecting higher mortality at older ages (fewer people reach old age). The steep narrowing indicates that while infant and child mortality have decreased (many survive to adulthood), mortality at older ages remains relatively high compared to developed countries.

This shape reflects the demographic characteristics of Stage 2: death rates have fallen sharply due to improvements in medicine, sanitation, and nutrition, while birth rates remain high because cultural norms, religious practices, and limited access to family planning have not yet changed. The result is rapid population growth with a young population structure (high youth dependency ratio).

(b) Two consequences of an ageing population:

Increased dependency ratio: A higher proportion of elderly dependents relative to the working-age population places greater financial strain on the workforce through higher taxes and social security contributions to fund pensions, healthcare, and elderly care services.
Labour shortage: As large cohorts of older workers retire, the working-age population shrinks, potentially leading to labour shortages in key sectors. This can reduce economic productivity and growth unless offset by immigration, automation, or policies to extend working lives.

(Alternative: rising healthcare costs; increased government spending on pensions and aged care; increased burden on families caring for elderly relatives; potential intergenerational conflict over resource allocation.)

Past migration influx: A large number of immigrants in this age group may have arrived over the past 10-20 years, contributing to the bulge in this specific age range. Many immigrants are young adults seeking work opportunities.
Past increase in birth rate (baby boom): An above-average birth rate 25-40 years ago would produce a larger cohort reaching these ages now. This could result from post-war recovery, government pro-natalist policies, or economic prosperity that encouraged larger families at that time.

Unit Test 2: Demographic Transition and Population Policies

Question

(a) Explain why many developing countries are currently experiencing rapid population growth, with reference to the Demographic Transition Model. [4 marks]

(b) China implemented the One-Child Policy (1979-2015). Describe two social consequences of this policy. [4 marks]

(c) Some countries (e.g., Singapore, Japan) have introduced pro-natalist policies. Explain two reasons why a government might wish to increase its birth rate. [4 marks]

Worked Solution

(a) Developing countries are experiencing rapid population growth because they are in Stage 2 or early Stage 3 of the DTM. In these stages, the death rate has fallen sharply due to improvements in healthcare, vaccination, sanitation, and food supply. However, the birth rate remains high because cultural and economic factors (value of large families for agricultural labour, limited education for women, limited access to contraception, religious and social norms favouring large families) have not changed as rapidly.

The large gap between the high birth rate and the now-low death rate results in a high rate of natural increase and rapid population growth. As these countries develop further (urbanisation, female education, industrialisation), birth rates gradually decline, moving them towards Stage 3 and eventually Stage 4.

(b) Two social consequences of China”s One-Child Policy:

Gender imbalance: A traditional preference for sons led to selective abortion, female infanticide, and abandonment of female babies. This created a significantly skewed sex ratio, with far more males than females in the population, making it difficult for many men to find marriage partners.
The “4-2-1 problem”: As the single-child generation ages, each working-age person may need to support two parents and four grandparents, creating an extreme dependency burden and placing enormous pressure on social welfare systems and individual families.

(Alternative: increased rate of forced abortions and sterilisations; “little emperor” syndrome — overindulged single children; increased female infanticide; ageing population challenges.)

Ageing population and declining workforce: A low birth rate combined with increasing life expectancy means fewer young people entering the workforce to support the growing elderly population. Increasing the birth rate would help replenish the working-age population over time.
Economic growth concerns: A shrinking population reduces the domestic market size, consumer demand, and economic dynamism. Pro-natalist policies aim to ensure a stable or growing population to sustain long-term economic growth, tax revenues, and national competitiveness.

(Alternative: national security concerns about insufficient military personnel; maintaining cultural continuity and national identity.)

Unit Test 3: Migration Patterns and Impacts

Question

(a) Define push factors and pull factors in the context of migration. Give two examples of each with reference to the Asia-Pacific region. [4 marks]

(b) Internal migration from rural to urban areas in China has created a large floating population of migrant workers in cities. Describe two challenges faced by these migrant workers in urban areas. [4 marks]

(c) Evaluate the impact of international migration on the country of origin. In your answer, refer to both positive and negative effects. [4 marks]

Worked Solution

(a) Push factors are conditions in the source area that drive people to leave (unfavourable conditions at origin). Pull factors are conditions in the destination that attract migrants (favourable conditions at destination).

Two push factors in the Asia-Pacific region:

Rural poverty and lack of employment opportunities in agricultural areas (e.g., farmers in impoverished provinces of China or the Philippines).
Natural disasters such as typhoons, floods, or earthquakes that destroy livelihoods and infrastructure (e.g., rural Bangladesh affected by flooding).

Two pull factors in the Asia-Pacific region:

Higher wages and employment opportunities in urban centres (e.g., factory jobs in Guangdong, construction work in Singapore).
Better access to education, healthcare, and social services in cities or destination countries (e.g., Filipino nurses migrating to Hong Kong or the Middle East).

(b) Two challenges faced by China’s migrant workers in urban areas:

Lack of access to social services: Migrant workers with rural hukou (household registration) often cannot access public education, healthcare, or subsidised housing in cities, as these services are tied to local hukou. Their children may need to attend private schools or remain in rural areas as “left-behind children.”
Poor working and living conditions: Migrant workers often work long hours in low-wage jobs in manufacturing, construction, or services, with limited legal protections. They may live in cramped dormitories, face wage arrears, and have little job security.

(Alternative: social discrimination and stigma; separation from family members; difficulty in obtaining urban residency permits.)

Remittances: Migrants send money back to their families, providing a significant source of foreign income. Remittances can reduce poverty, improve living standards, and fund education and healthcare. For countries like the Philippines, remittances are a major contributor to GDP.
Skills transfer: Some migrants return with new skills, knowledge, and experience acquired abroad, which can contribute to entrepreneurship and economic development in the country of origin.

Negative impacts:

Brain drain: The emigration of highly educated and skilled professionals (doctors, engineers, scientists) deprives the country of human capital needed for development. Many developing countries lose their best-trained workers to developed nations.
Family disruption: Long-term separation of family members can weaken social structures, affect children’s development (especially if parents migrate and leave children behind), and create dependency on remittances rather than local economic development.

Integration Test 1: Population and Urbanisation

Question

A rapidly urbanising country in Southeast Asia has experienced the following changes over 30 years: rural population has declined from 70% to 40%, urban population has increased from 30% to 60%, and the capital city has grown from 3 million to 12 million inhabitants.

(a) Explain two push factors and two pull factors that could account for the rapid rural-to-urban migration in this country. [4 marks]

(b) Describe two environmental problems and two social problems likely to result from the rapid growth of the capital city. [4 marks]

(c) The government is considering developing a new town 50 km from the capital to relieve overcrowding. Evaluate the likely effectiveness of this strategy. [4 marks]

Worked Solution

(a) Two push factors:

Mechanisation of agriculture: Modern farming equipment and techniques have reduced the demand for agricultural labour, leaving many rural workers unemployed and prompting them to seek work in cities.
Lack of rural services: Limited access to quality education, healthcare, electricity, and clean water in rural areas pushes families to migrate to urban centres where these services are available.

Two pull factors:

Employment opportunities: The capital city offers diverse employment in manufacturing, services, construction, and the informal sector, with significantly higher wages than rural agricultural work.
Better social infrastructure: Urban areas offer better schools, hospitals, and entertainment facilities, attracting families seeking improved quality of life and opportunities for their children.

(b) Two environmental problems:

Air and water pollution: Rapid industrialisation and increased vehicle use produce air pollution (particulate matter, NOx, SO2). Industrial discharge and untreated sewage contaminate rivers and groundwater, affecting water quality and aquatic ecosystems.
Loss of agricultural land and green space: Urban sprawl consumes productive agricultural land on the urban fringe and destroys natural habitats, reducing biodiversity and the city’s ecological capacity to absorb pollution and manage stormwater.

Two social problems:

Inadequate housing: Rapid population growth outpaces housing construction, leading to the growth of informal settlements (slums) with poor sanitation, overcrowding, and fire hazards.
Traffic congestion and transport strain: Road infrastructure cannot cope with the growing population, resulting in severe congestion, long commuting times, reduced economic productivity, and increased air pollution from vehicle emissions.

Likely benefits: A new town can decentralise population away from the overcrowded capital, reducing pressure on housing, transport, and services. Planned development allows for modern infrastructure, self-contained communities with employment, schools, and healthcare, and can incorporate sustainable design (public transport, green spaces).

Limitations: (1) New towns require massive capital investment that the government may not afford. (2) Employment opportunities in the new town may be insufficient, meaning residents still commute to the capital, negating decentralisation benefits. (3) The new town may attract further rural migrants rather than relieving existing capital overcrowding. (4) It may take decades to become fully functional.

Overall: The strategy can be partially effective if well-planned with adequate employment, transport links, and phased development, but it is not a complete solution and must be part of a broader urban management strategy including improved urban planning in the existing capital.

Integration Test 2: Population Resources and Sustainable Development

Question

Country C has a population of 50 million, an annual growth rate of 2.5%, and a population density of 250 persons per km squared. 60% of the population is employed in agriculture, which contributes only 20% of GDP. Arable land per capita has declined from 0.3 hectares in 1990 to 0.15 hectares in 2025.

(a) Explain the relationship between population growth and the declining availability of arable land per capita in Country C. [3 marks]

(b) Evaluate two strategies that Country C could adopt to increase agricultural productivity without expanding the area of cultivated land. [6 marks]

(c) To what extent can sustainable development principles resolve the tension between population growth and resource scarcity in Country C? [6 marks]

Worked Solution

(a) The population of Country C is growing at 2.5% per year, meaning the total population is increasing significantly over time. However, the total area of arable land is essentially fixed (it can decrease due to urbanisation, soil degradation, and desertification but cannot easily increase). As the same amount of arable land must support a growing population, the arable land per capita declines. This is reflected in the decline from 0.3 to 0.15 hectares per person — a halving in just 35 years.

This means each farmer and each family has less land to produce food, threatening food security and pushing farmers onto marginal land (slopes, forests), which accelerates environmental degradation.

(b) Two strategies to increase agricultural productivity:

Strategy 1: Green Revolution technologies

Introduce high-yielding crop varieties (HYVs) that produce more grain per unit area.
Apply chemical fertilisers and pesticides to increase yields and reduce crop losses.
Expand irrigation systems to allow multiple harvests per year and reduce dependence on rainfall.
Evaluation: Effective in increasing yields in the short term (e.g., wheat and rice yields doubled in many Asian countries during the Green Revolution). However, chemical inputs are expensive, may cause soil degradation and water pollution over time, and HYVs may require more water and fertiliser than traditional varieties, creating dependency.

Strategy 2: Agricultural education and extension services

Train farmers in improved techniques such as crop rotation, intercropping, integrated pest management (IPM), and soil conservation methods.
Provide access to credit, markets, and weather information through extension services.
Evaluation: Sustainable and cost-effective in the long term. Education empowers farmers to make informed decisions and adapt to local conditions. However, results may be slow to materialise, and success depends on adequate funding, trained extension workers, and farmer willingness to adopt new practices.

Arguments that sustainable development can help significantly:

Sustainable agricultural practices (organic farming, agroforestry, conservation agriculture) can maintain soil fertility and productivity long-term without degrading the resource base.
Family planning and education (especially female education) can reduce the population growth rate, easing pressure on resources. Educated women tend to have fewer children and invest more in each child’s education and health.
Diversifying the economy away from agriculture (industrialisation, services) reduces dependence on arable land and creates alternative livelihoods, allowing fewer farmers to support the whole population.

Arguments that sustainable development alone is insufficient:

Population momentum means that even with reduced fertility, the population will continue to grow for decades due to the large young population. Pressure on resources will increase before it stabilises.
Structural barriers (corruption, lack of infrastructure, poverty) may prevent the implementation of sustainable practices, even with good policy intentions.
Climate change poses additional threats to agricultural productivity (droughts, floods, shifting growing seasons) that sustainable development alone cannot fully address.

Conclusion: Sustainable development principles are necessary but not sufficient on their own. They must be combined with effective governance, international cooperation, and adaptation to climate change to meaningfully resolve the tension between population growth and resource scarcity.

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