Processes of Population Change

Correct answer: B. Considering births, deaths, migration, age structure and the time period together

Direct answer: Option B is correct. Expert analysis studies population change as the result of interacting processes rather than treating one statistic as the whole explanation. Births and deaths determine natural increase or decrease. Migration may add or remove people, while age structure shows whether future births, labour supply or dependency pressure may change. The time period is essential because a short-term movement may have a different meaning from a long-term trend. Option A is wrong because birth rate alone ignores deaths, migration and age composition. Option C is wrong because area does not measure demographic change. Option D is wrong because memorising density gives a number of people per unit area but does not explain why population changes. A sound analysis compares all relevant factors and checks their direction and timing. Memory cue: ask who is being added or removed, by which process, and over what period.

Correct answer: A. A decrease of 200

Direct answer: Option A is correct. First calculate natural increase: births minus deaths equals 3,200 − 2,300 = 900. This means the population would increase by 900 through births and deaths alone. Next include net migration. A negative net migration of 1,100 means 1,100 more people left than entered, so it contributes −1,100. Total population change equals natural increase plus net migration: 900 + (−1,100) = −200. The negative sign means a decrease of 200 people. Option B reverses the sign and is incorrect. Option C gives only the natural increase and ignores migration. Option D incorrectly adds all figures, even though deaths and negative migration reduce population. Memory cue: total change = births − deaths + net migration; keep the sign of negative migration.

Correct answer: A. The total population may increase

Direct answer: Option A is correct. Negative natural increase means deaths are greater than births, so the population would decrease through natural change. However, total population also depends on migration. If the number of people entering is sufficiently greater than the number leaving, high in-migration can offset the natural decrease. For example, a natural decrease of 500 combined with a net migration gain of 1,000 produces a total increase of 500. Option B is wrong because neither negative natural increase nor migration makes the population automatically zero. Option C is wrong because migration directly changes the number of residents. Option D is wrong because a negative natural increase does not mean that births stop; it only means births are fewer than deaths. Memory cue: natural change and migration are two separate balances; the larger positive balance can determine the total result.

Correct answer: A. Total increase

Direct answer: Option A is correct. When births and deaths are equal, natural increase is zero because the number added by births exactly matches the number removed by deaths. The total population can still change through migration. If in-migration is greater than out-migration, net migration is positive: more people enter than leave. Adding zero natural increase to positive net migration gives a total increase. Option B is wrong because the migration balance is positive, not negative. Option C is wrong because equal births and deaths do not produce natural decrease; they produce zero natural increase. Option D is wrong because the statement clearly describes movement in both directions. A simple example is 1,000 births, 1,000 deaths and a net migration gain of 300, giving a total increase of 300. Memory cue: equal births and deaths cancel; more arrivals than departures still raise the total population.

Correct answer: A. By studying births, deaths, net migration, age structure and social factors together

Answer: A. Population change is a demographic process, so it cannot be understood from one number alone. Begin with natural change: births minus deaths. Then add net migration, which is immigration minus emigration. Age structure shows whether children, working-age people, or older people form the larger share, while social factors such as education, health, marriage patterns, and employment can influence demographic behaviour. Therefore, a reliable exam analysis combines all these related indicators. Option B is incomplete because birth rate alone ignores deaths and migration. Option C gives only a definition and does not analyse an actual process. Option D concerns area and density, but density describes how people are spread, not all causes of population change. Memory cue: change means births minus deaths plus net migration; structure explains who the people are.

Correct answer: A. Preparation for skills, jobs, housing and urban services

Answer: A. Natural increase is births minus deaths. If it is zero, births and deaths balance each other, but the population can still change because people are moving in or out. Rising immigration of young people increases the local supply of workers and may also increase demand for housing, schools, transport, health care, training, and employment services. Planners must therefore consider both the number and the age or skill profile of migrants. Option B is wrong because ignoring migration would produce an unrealistic forecast. Option C is wrong because zero natural increase does not mean zero service demand. Option D is incomplete because births and deaths do not show the effect of migration. Memory cue: zero natural increase does not mean zero population movement or zero planning need.

Correct answer: A. The shares of children and working-age groups may increase

Answer: A. Population structure means the composition of the population by age and other characteristics. A low birth rate by itself tends to reduce the proportion of children over time, but the arrival of young families can change that pattern. The adults add to the working-age group, and their children add to the child group. The exact result depends on the number, ages, and family composition of migrants, so the question correctly says “may increase.” Option B is impossible because migration does not make every age group disappear. Option C is an unsupported absolute claim; migration does not automatically double mortality. Option D is wrong because age is an important characteristic of migrants. Memory cue: migration changes not only population size but also population composition.

Correct answer: A. Pressure for a decline in the national population may occur

Answer: A. Natural increase is zero when births and deaths are equal. International emigration means residents leave the country for another country. At the national scale, such out-migration reduces the number of people counted in the country, unless it is offset by immigration or another component of growth. Therefore, high international emigration can create pressure toward a decline in the national population. Option B is wrong because increase is not guaranteed. Option C confuses internal migration with international migration: movement within a country changes regional distribution but not the national total, whereas international movement can change the national total. Option D is unsupported because emigration does not automatically raise birth rates. Memory cue: always identify the scale—internal migration redistributes, international migration can change the national total.

Correct answer: A. A decrease of 300

Answer: A, a decrease of 300. Solve the two components separately. First calculate natural increase: births minus deaths = 3,100 − 3,100 = 0. Next calculate net migration: immigrants minus emigrants = 900 − 1,200 = −300. Finally combine them: total population change = natural increase + net migration = 0 + (−300) = −300. A negative result means the population decreases by 300. Option B reverses the sign of net migration. Option C notices that natural increase is zero but forgets migration. Option D incorrectly adds births and deaths and also ignores the direction of migration. Memory cue: use the formula births − deaths + immigrants − emigrants; keep the signs clear.