Population Growth

Correct answer: B. Migration-based growth

Direct answer: B is correct. In-migration means people are moving into a city from other places. These newcomers are added to the city’s population, so the city can grow even when its birth rate is low. Natural increase is calculated from births minus deaths; it cannot be the main explanation when births are low and rapid in-migration is clearly present. B is correct because it identifies movement into the city as the major source of increase. A is wrong because natural increase depends on the balance between births and deaths, not simply on arrivals. C is wrong because deaths reduce population rather than increase it. D is wrong because a larger area does not automatically create more inhabitants. Memory cue: births minus deaths is natural increase; inward movement is migration growth.

Correct answer: C. Number, rate, structure, migration and resources should all be studied

Direct answer: C is correct. A balanced study uses several connected measures. Total population shows the size of the population; the growth rate shows how quickly it is changing; age structure shows the share of children, working-age people and older people; migration shows movement into or out of a place; and resources indicate whether food, water, housing, education, health care and employment can meet needs. C is correct because it considers size, speed, composition, movement and carrying capacity together. A is wrong because total number does not show the rate or age structure. B is wrong because birth rate alone ignores deaths, migration and population composition. D is wrong because map colours are only a way of presenting information and cannot replace analysis. Memory cue: good population analysis asks “how many, how fast, who, where from, and what resources?”

Correct answer: A. When a large young population already exists

Direct answer: A is correct. A population with many young people contains a large number of people who may enter child-bearing ages in the future. Even if the average birth rate begins to fall, the large number of potential parents can produce enough births for total population to continue increasing for some time. This delayed continuation is called population momentum. A is correct because it links future growth to the existing age structure. B is wrong because a death rate much higher than the birth rate would generally reduce natural increase. C is wrong because outward migration removes people and usually lowers population growth. D is wrong because a zero population cannot itself continue growing without people entering it. Memory cue: a young age structure can keep growth moving after fertility declines.

Correct answer: A. Growth continuing for some time due to previous age structure

Direct answer: A is correct. Population momentum is the tendency of population growth to continue for some time because of the age structure created in earlier years. If a population previously had many children and young adults, many people may later enter reproductive ages. Consequently, births can remain substantial even after fertility or birth rates begin to decline. A is correct because it describes this delayed effect of past age composition on future growth. B is wrong because it refers to the movement of water, not demography. C is wrong because momentum does not mean that deaths become zero. D is wrong because density and area are different geographical measures. The term “momentum” is a memory clue: like a moving object that does not stop instantly, population growth may not stop immediately when birth rates fall.

Correct answer: A. It can pressure per capita availability of education and health services

Direct answer: A is correct. Rapid population growth can increase the number of people who need schools, teachers, hospitals, doctors, vaccination, sanitation and other services. If public services do not expand at a similar pace, the amount available per person may fall and existing facilities may become crowded. A is correct because it identifies a realistic social effect and uses the important idea of per capita availability. B is wrong because population growth does not change the direction of seas. C is wrong because rainfall is controlled by atmospheric and geographical processes, not always stopped by population growth. D is wrong because fast growth makes reliable census information more important, not unnecessary. The effect is not automatic in every place; planning and investment can reduce pressure. Memory cue: compare service growth with population growth, not population size alone.

Correct answer: B. In-migration is playing an important role

Direct answer: B is correct. Natural increase is the difference between births and deaths. Total population change also includes migration: total growth is influenced by natural increase plus net migration. Therefore, if natural increase is low but the total population is growing rapidly, a reasonable conclusion is that more people are entering than leaving, or that in-migration is making an important contribution. B is correct because it explains the gap between the two measures. A is not necessarily correct; a high death rate could lower natural increase but does not by itself explain high total growth. C is wrong because low natural increase does not prove that births are zero. D is wrong because the question states that total growth is high. Memory cue: when total change is greater than natural increase, investigate net migration.

Correct answer: A. Because regional differences may be hidden in the average

Direct answer: A is correct. A national average combines data from many regions into one figure. That figure may be useful as a broad summary, but it can hide important differences: one region may have very high growth, another may have low or negative growth, and a third may face unusual population density or service pressure. Planning needs local information about population size, growth rate, age structure, migration, resources and facilities. A is correct because it recognizes that averages can conceal regional variation. B is wrong because averages are calculated and widely used, although they are not sufficient alone. C is wrong because regions do not necessarily grow at the same rate. D is wrong because averages can describe population and many other subjects, not only weather. Memory cue: an average gives the centre, but planning also needs the spread and local differences.

Correct answer: A. Comparison of different time periods becomes easier

Correct answer: A. An annual growth rate expresses population change using one common time unit: one year. This makes the average pace of change easier to compare. For example, a population increase measured over two years and another increase measured over five years cannot be judged fairly by looking only at the total increase, because the periods have different lengths. Expressing both as annual rates helps show how much change occurs per year. A is correct because it standardises the time basis. B is wrong because an annual rate does not calculate land area. C is wrong because births and deaths remain important data used in population analysis. D is wrong because changing the time unit does not stop migration. Memory cue: annual rate means “per year”; it improves comparison, not the physical conditions being measured.

Correct answer: A. Future growth may fall as the reproductive-age group becomes smaller

Correct answer: A. Migration changes the age and sex composition of both the place people leave and the place they enter. If many young adults leave a region for work, the region may have fewer people in the ages when families commonly form and children are born. Over time, this can reduce the number of births and weaken future natural increase, although the actual result depends on the scale and duration of migration and on other demographic conditions. A is correct because it describes a possible long-term age-structure effect. B is wrong because the departure of young people does not automatically increase births. C is wrong because out-migration may reduce or slow the population, not always increase it. D is wrong because migration cannot make the death rate permanently zero. Memory cue: migration is not only a change in place; it can also change the age structure.

Correct answer: A. When an educated and healthy working population gets employment

Correct answer: A. A large or growing working-age population can support economic development when people are healthy, educated, skilled, and able to find productive work. The sequence is important: education and health improve capabilities; skills and suitable jobs allow people to earn; employment can raise production, savings, and tax resources; and these resources can support families and public services. This possible advantage is often called a demographic dividend, but it is not automatic. A is correct because it includes the necessary conditions. B is wrong because declining resources create pressure rather than an economic benefit. C is wrong because the absence of schools and hospitals weakens human capital. D is wrong because a population made entirely of dependants has no sufficient working base. Memory cue: a young population becomes a dividend only when people are prepared and employed.

Correct answer: A. Because education, health, and employment are necessary for it

Correct answer: A. Demographic dividend means a possible economic advantage created by a relatively large working-age population compared with dependants. Population growth alone does not guarantee this advantage. First, people need education and skills to become productive. Second, good health enables them to study, work, and contribute effectively. Third, the economy must create decent and suitable jobs; otherwise, a large working-age group may face unemployment or low productivity. A is correct because it identifies these essential conditions. B is wrong because population growth is not always harmful or always beneficial; its effects depend on conditions and management. C is wrong because the working-age group is central to the idea of a demographic dividend. D is wrong because population data can be collected and measured. Memory cue: dividend means a benefit that requires preparation and opportunity, not merely more people.

Correct answer: A. Expanding services for a rapidly rising population

Correct answer: A. When the death rate falls but the birth rate remains high for some time, more people survive while births continue at a relatively high level. This can produce a period of rapid population growth. Planning authorities then need to anticipate and expand schools, health centres, housing, drinking water, sanitation, transport, food supply, and employment opportunities. A is correct because rapid growth increases the number of people who need services and infrastructure. B is wrong because ignoring the population would make planning less realistic. C is wrong because migration and weather are different concepts. D is wrong because reliable census and population data are useful for estimating needs. The delay between the fall in death rate and the later fall in birth rate is often described as a time lag; it can create special planning pressure. Memory cue: deaths fall first, births stay high for a while, so service demand rises quickly.

Correct answer: A. Because its impact depends on resources, skills, employment opportunities, and governance capacity

The correct answer is A. High population growth does not produce the same result everywhere. First, population growth increases the number of people who need food, water, housing, schools, health care and jobs. Therefore, if resources and public services are limited, rapid growth can create pressure, unemployment and shortages. However, a large and educated working-age population can also support production, innovation and economic development when suitable jobs, skills, infrastructure and effective governance are available. This possible benefit is often called a demographic dividend, but it is not automatic. Option A is correct because it considers both opportunities and difficulties. Option B is wrong because population growth clearly affects the demand for resources and services. Option C is wrong because growth does not bring economic benefit in every situation. Option D is wrong because population change is influenced by births, deaths and migration. Memory cue: population growth is an opportunity only when planning and capacity grow with it.

Correct answer: A. Because births, deaths, migration and policies change over time

The correct answer is A. A population forecast is an estimate of how many people may live in a place in the future. To make it, demographers study the present population, birth rates, death rates and migration. The difficulty is that these factors can change. Families may choose to have fewer or more children, medical improvements may change death rates, and people may move because of jobs, education, disasters or conflict. Government policies and economic conditions can also influence these decisions. Thus, a forecast is based on available evidence and assumptions; it is not a fixed promise. Option A is correct because it identifies the main changing components. Option B is false because population changes continuously through births, deaths and migration. Option C is false because family sizes differ between households and regions. Option D is false because migration patterns vary from place to place and from one period to another. Memory cue: forecast equals estimate, not certainty; check births, deaths and migration before judging it.

Correct answer: A. If children are very many, dependency pressure on the working population can rise

The correct answer is A. The dependency ratio compares people who are generally not in the working-age group with people of working age. Children and older persons may depend partly on workers for food, education, health care and other needs. If the number or share of children rises rapidly while the working-age population does not grow at the same pace, each worker may support more dependants. This can increase the need for schools, nutrition programmes and family spending. It does not mean that children have no value; it explains the economic responsibility carried by the working population. Option A correctly connects age composition with dependency pressure. B is wrong because rainfall is not the basis of the ratio. C is wrong because the ratio explicitly compares dependants with working-age people. D is wrong because the ratio is not always zero. Memory cue: more dependants per worker means greater dependency pressure.

Correct answer: A. When regions have different growth rates and migration patterns

The correct answer is A. Population conditions are not identical in every region. One area may have a high birth rate, another may receive many migrants, and a third may have an ageing population or limited services. Because the causes and effects differ, a single national target may not suit all places. Regional targets allow planners to match schools, hospitals, employment programmes, housing and transport with local needs. Option A is correct because different growth rates and migration patterns create different planning requirements. Option B is wrong because identical problems would reduce the need for separate regional targets. Option C is wrong because the absence of census data makes accurate target-setting more difficult, not more necessary in itself. Option D is wrong because equal births and deaths do not describe every regional condition and do not remove regional differences. Memory cue: different demographic conditions require locally suitable planning.

Correct answer: A. Economic output may not be rising in line with population growth

The correct answer is A. Per capita income means average income or output available per person. It can be understood by dividing total income by total population. If the population increases rapidly but total economic production grows slowly, the larger total output is being shared among more people, so average income may remain unchanged or fall. This does not prove that population growth is the only cause; education, employment, prices, inequality and productivity also matter. Option A is the most suitable analysis because it compares the pace of economic output with the pace of population growth. B is wrong because mountains do not determine per capita income by themselves. C is wrong because population growth does not always raise income. D is wrong because population size and economic output can affect average income. Memory cue: per capita asks, “How much is available for each person?”

Correct answer: A. When boundaries have changed or a new district has been formed

The correct answer is A. Population growth is often measured by comparing the population of the same area at different times. If district or regional boundaries change, the two figures may no longer refer to exactly the same territory. A new district may be created by separating villages or towns from an older district, so the apparent increase or decrease may partly reflect an administrative change rather than actual demographic growth. Researchers should therefore check whether the data have been adjusted to a common boundary before comparing them. Option A is correct because boundary changes affect the comparison base. B, C and D do not by themselves make population figures incomparable. Rainfall, language and the age of villages may be relevant to other studies, but they do not explain this specific statistical caution. Memory cue: before comparing growth, compare the boundaries.

Correct answer: A. Because it indicates social balance and future demographic structure

The correct answer is A. Population growth tells us how the number of people changes, but it does not describe the composition of that population. Sex ratio, usually expressed as the number of females per number of males or per a specified number of males, helps show the balance between females and males in a population. Studying it with growth can reveal whether future age groups and family-forming groups may be balanced or uneven. It can also encourage questions about gender conditions, migration patterns, survival and social development. Sex ratio alone does not explain every social condition, so it should be interpreted with other data. Option A is correct because it connects sex composition with future demographic structure. B is wrong because sex ratio is not a rainfall measure. C is wrong because it does not make birth rate zero. D is wrong because it is not an area formula. Memory cue: growth tells how many; sex ratio helps describe who makes up the population.

Correct answer: A. Elderly care, health security, and social support

The direct answer is A. A lower death rate often means that people are living longer, so the number and share of older people may rise. Policy must therefore prepare health services, regular medical support, medicines, accessible facilities, pensions or other social-security measures, and care for daily needs. This does not mean that every older person is dependent; it means planning should respond to changing age structure. Option B is too narrow: increasing births alone does not provide care for people who are already elderly and may create new pressures. Option C is wrong because a census and other data are needed to measure ageing and plan services. Option D is wrong because migration can also affect the size and age composition of a region. Memory cue: longer lives require age-sensitive planning.

Correct answer: A. Population growth must be balanced with resource conservation and human development

The direct answer is A. Sustainable development means improving people’s well-being while using resources carefully so that future generations also have opportunities. Population growth affects demand for food, water, housing, energy, education, health care, and employment. Therefore, planning must connect population needs with conservation, efficient resource use, equal access, and human development. Option B is wrong because people are at the centre of development planning. Option C is wrong because rapid population growth does not automatically produce jobs, services, or sustainability. Option D is wrong because conservation includes water, soil, energy, biodiversity, and other resources, not only forests. Memory cue: sustainability requires a balance among people, resources, and quality of life.