Population Growth

The correct answer is A. Birth rate is the number of live births in relation to the population during a specified period. Social customs can influence when people marry and how many children families consider desirable. If marriage occurs at a relatively young age and large families are socially accepted, the period during which births may occur can be longer, and families may prefer more children. These conditions can help maintain a high birth rate, although economic, health and educational factors also matter. A is correct because it identifies two social influences connected with fertility. B is wrong because an old population generally contains fewer people in the main childbearing ages, so it does not by itself maintain a high birth rate. C is wrong because everyone leaving would reduce the local population, not directly create births. D is wrong because complete urban services do not necessarily produce a high birth rate and often accompany changing family preferences. Memory cue: social customs can shape fertility decisions.

The correct answer is A. Long-term population change is influenced by the choices people can make and by their access to services. Education, especially for girls and women, can delay marriage, improve knowledge and support informed decisions. Health services reduce avoidable deaths and provide access to voluntary family-planning information and methods. When families are informed and able to choose the timing and spacing of children, fertility can gradually decline in a humane and sustainable way. A is correct because it combines human development with voluntary family planning. B is wrong because stopping the census only removes information; it does not change births or deaths. C is wrong because increasing deaths is harmful and is not an acceptable population measure. D is wrong because migration information does not directly address fertility and withholding information is not a sound policy. Memory cue: sustainable change comes through education, health and informed choice, not coercion.

The correct answer is A. Population growth depends strongly on the difference between birth and death rates. First, if the death rate falls while births remain comparatively high, fewer people die and the gap between births and deaths becomes larger. This produces rapid population growth. Later, if births gradually decline, the gap becomes smaller, so growth slows. This sequence is a basic feature of demographic transition: mortality often falls before fertility falls. A is correct because it follows the order described in the question. B is wrong because the difference between births and deaths is not automatically zero. C is wrong because falling births do not immediately mean that deaths exceed births. D is wrong because changes in both rates clearly produce demographic change. The exact speed depends on the size and timing of the changes. Memory cue: death rate falls first—growth accelerates; birth rate falls later—growth decelerates.

The correct answer is A. Spatial study means examining how a phenomenon varies from place to place. Population growth is not uniform because regions differ in birth rates, death rates, migration, education, health care, employment and living conditions. A map or regional comparison can show where growth is high, moderate or low. This information helps governments plan schools, hospitals, housing, transport, jobs and other services according to local needs rather than using one identical plan everywhere. A is correct because it states the essential reason for spatial analysis. B is wrong because birth rates are not identical in every state or region. C is wrong because migration does occur and can change regional population quickly. D is wrong because people live on land in settlements, not only in seas. Memory cue: spatial study asks “where?” and explains regional differences.

The correct answer is A. A base year is the earlier reference point against which a later population is compared. To find absolute growth, we subtract the base-year population from the later population. To find percentage growth, the increase is related to the base-year population, commonly expressed as: percentage growth = (later population − base-year population) ÷ base-year population × 100. Therefore, the selected base year affects the reference and makes comparisons meaningful only when the same basis is used. A is correct because it explains why the base year is needed. B is wrong because a statistical base year does not control weather. C is wrong because it cannot alter physical river direction. D is wrong because a date used for calculation has no power to stop births. Memory cue: base year = starting reference for comparison.

Direct answer: A is correct. A growth rate tells us how quickly the population is changing, while population decline means that the total number of people has actually become smaller. If the rate falls from 3% to 1%, growth has slowed, but 1% is still positive, so the population continues to increase. For example, 1,000 people growing at 1% become 1,010 people. A is correct because it distinguishes a slower increase from an actual decrease. B is wrong because a rate has a clear mathematical and demographic meaning. C is wrong because populations are not always zero. D is wrong because it makes an unsupported claim about death and birth rates and is not needed to explain the difference. Memory cue: “lower growth” does not automatically mean “lower population”; check whether the rate is positive, zero, or negative.

Direct answer: A is correct. Policy makers must plan schools, hospitals, housing, jobs, transport, water and other services according to where people live and how quickly their numbers change. Rapid growth creates urgent demand, while uneven growth means that some regions may face overcrowding and pressure while others need different kinds of planning. A combines both difficulties. B is generally easier to plan for because change is slow and balanced. C means that the total population is not changing, although other planning needs can still exist; it is not the most challenging growth pattern listed. D is not demographic growth at all; changing map colours only changes presentation. Memory cue: rapid plus uneven means “different places need different urgent plans.”

Direct answer: A is correct. Standard of living depends on access to food, water, housing, education, health care, employment and other services, not simply on the number of people. When population grows rapidly and resources or services do not expand fairly, competition and pressure may increase, lowering the quality of life for some groups. However, growth does not automatically lower living standards; good planning, productive employment and fair distribution can reduce the pressure. B is wrong because rapid growth does not guarantee wealth for everyone. C is wrong because population size and change affect demand for resources and services. D is wrong because mountain height alone cannot decide living standards. Memory cue: population pressure depends on people, resources and distribution together.

Direct answer: B is correct. Population change is not determined by births alone. Natural change is found by comparing births with deaths: natural increase equals births minus deaths. Net migration must then also be included: total change equals births minus deaths plus net migration. Thus, a high birth rate may be offset by many deaths or by people leaving the area. A is wrong because birth rates can change over time and from place to place. C is wrong because area can affect density, but it does not by itself determine population growth. D is wrong because births are important demographic events and are recorded through vital registration and demographic data, even though a census is conducted at intervals. Memory cue: “births minus deaths, plus migration.”

Direct answer: B, 700, is correct. First calculate natural increase by subtracting deaths from births: 3,600 − 2,100 = 1,500. Next include net migration. Since migration is −800, it reduces the increase: 1,500 + (−800) = 700. Therefore the population grows by 700 people, not by 1,500. A is only the natural increase and ignores migration. C would result from adding 800 instead of subtracting it, so it uses the wrong sign. D incorrectly adds births, deaths and migration without considering that deaths and outward migration reduce population. The safest method is to write the formula first: total change = births − deaths + net migration. Memory cue: a negative migration value must be added algebraically, which means it is subtracted in the final calculation.

Direct answer: A is correct. Begin with natural change: births minus deaths = 1,800 − 2,400 = −600, so there is a natural decrease of 600. Now add net migration of +1,000: −600 + 1,000 = +400. The final result is therefore an increase of 400 people. B stops after calculating natural change and ignores migration. C counts only migration and ignores the natural decrease. D adds the figures without respecting the roles of births and deaths, producing an incorrect result. A positive migration balance can offset a natural decrease when more people enter than leave. Memory cue: calculate natural change first, then add the signed migration value.

Direct answer: A is correct. A growth rate is usually expressed as a percentage of the starting, or base, population. The same percentage therefore produces different numbers when the bases differ. For example, 10% growth in an area with 1,000 people adds 100 people, while 10% growth in an area with 10,000 people adds 1,000 people. Both rates are equal, but the absolute increases are different. B is wrong because growth rate measures change relative to population, not area. C is wrong because equal birth rates are not guaranteed and do not explain the mathematical point. D is wrong because migration can affect actual population change. Memory cue: percentage needs a base; always ask “10% of how many?”

Direct answer: B is correct. Growth rate is calculated by comparing the increase with the base population, usually as: growth rate = increase ÷ base population × 100. If the same number of people is added to two areas, that addition forms a larger percentage of the smaller base. For example, an increase of 100 is 10% of 1,000 but only 1% of 10,000. Therefore the first area, with the smaller base, has the higher rate. A is wrong because it reverses the percentage relationship. C is wrong because an actual increase is not zero growth. D is wrong because an increase gives a positive, not necessarily negative, change. Memory cue: same increase plus smaller base equals higher percentage rate.

The correct answer is A. Population momentum means that population may continue to grow even after fertility or birth rates begin to fall. The reason is age structure: when a country has a very large number of young people entering or already in reproductive ages, many births can occur in total, even if each woman has fewer children on average. Option A correctly connects a falling birth rate with a large young population and continuing growth. Option B is wrong because a rising death rate does not instantly make a population zero. Option C confuses land area with birth behaviour; area alone does not determine birth rate. Option D is unrelated because migration need not become zero. Memory cue: rate can fall while the large age group keeps the total number of births high.

The correct answer is A. A birth rate is a rate or proportion, while the total number of births is an actual count. Suppose a low rate applies to a very large number of people in the reproductive-age group. Even a small proportion of a large group can produce many births. Therefore, total births may remain high for some time. Option A correctly distinguishes rate from number. Option B is wrong because a low rate is not the same as zero births. Option C is unrelated; birth rate does not automatically determine the death rate. Option D is too definite because population also depends on deaths and migration, and it may not decline immediately. Memory cue: low rate does not always mean low total number when the base population is large.

The correct answer is A. Natural increase is calculated as births minus deaths. If births and deaths are almost equal, natural increase is close to zero. Total population growth also includes migration: total growth is natural increase plus net migration, where net migration means in-migration minus out-migration. Thus, strong in-migration can make total growth positive even when births and deaths nearly balance. Option A states both conditions. Option B would usually reduce population because out-migration is high. Option C gives no positive migration and has high deaths. Option D describes negative net migration, which works against growth. Memory cue: natural change comes from births and deaths; total change also includes migration.

The correct answer is A. Natural increase is negative when deaths exceed births. However, total growth includes net migration. If the number of people entering an area is greater than the natural decrease and greater than departures, net migration can be sufficiently positive to raise the total population. Option A correctly describes this balance. Option B would make net migration negative and would reinforce population loss. Option C provides no births and no in-migration, so it cannot create positive total growth. Option D includes high deaths and out-migration, both of which tend to reduce population. Memory cue: a negative natural balance can be overcome by sufficiently large positive net migration.

The correct answer is A. Population growth is a general change in population size over time. It may be positive, zero, or negative, depending on births, deaths, and migration. Population explosion is a stronger expression used for very rapid or excessive population increase that can create serious pressure on resources, employment, housing, education, health care, and the environment. Option A correctly shows that every increase is not necessarily an explosion. Option B is wrong because the terms are not always identical. Option C confuses population with land area. Option D is wrong because population growth can be positive or negative. Memory cue: growth is the broad idea; explosion suggests unusually rapid and difficult-to-manage growth.

The correct answer is A. When the birth rate remains low, fewer children enter the population. When life expectancy rises, more people survive to older ages and live longer. Together, these trends can increase the proportion and number of elderly people, making planning for health care, pensions, accessible housing, transport, and social support more important. Option A includes both relevant demographic changes. Option B generally produces a larger young population and does not specifically describe ageing. Option C removes the group that needs planning. Option D is not the defining condition; migration may affect age structure, but the stated combination in A directly increases ageing pressure. Memory cue: fewer births plus longer lives usually means an ageing population.

The correct answer is A. Service capacity means the number of people that schools, hospitals, water systems, transport, housing, and other facilities can adequately support. Step by step, population growth increases demand for these services. If facilities expand at the same pace, demand and capacity can remain more balanced. If population grows faster than capacity, more people must share the same classrooms, hospital beds, water supply, roads, or homes. This can cause overcrowding, longer waiting times, shortages, and pressure on public systems. Option B is wrong because a larger population usually increases service needs. Option C is wrong because population size directly affects demand. Option D is wrong because slow capacity expansion can create shortages, not always benefits. Memory cue: faster demand growth than supply creates pressure.

Direct answer: A. A growth rate is a percentage calculated on a starting population, called the base population. A high percentage on a very small base may add only a small number of people at first. For example, growth of 10% on 100 people adds 10 people, while 10% on 10,000 people adds 1,000 people. If schools, clinics, water supply, housing and transport already have sufficient capacity, they may manage the initial increase without immediate severe pressure. A is correct because it combines a small base with adequate service capacity. B is wrong because a large base and weak services can create strong pressure. C is wrong because closing services does not make pressure low; it makes access worse. D is wrong because absent water and housing represent severe shortage, not low pressure. Memory cue: percentage needs a base; also compare demand with capacity.

Direct answer: A is the incorrect statement. Absolute increase means the actual number added or lost: final population minus initial population. Growth rate is usually expressed as a percentage and must be calculated using the initial population as the base. The same percentage does not always produce the same numerical increase. For instance, 5% of 200 is 10, whereas 5% of 2,000 is 100. Thus, A wrongly treats equal percentages as equal absolute changes. B is correct because absolute increase is the real numerical difference. C is correct because a percentage helps compare growth between populations of different sizes, although the base and period must be stated. D is correct because a larger base produces a larger absolute change at the same rate. Memory cue: rate is a percentage; increase is a number.

Direct answer: A. A reliable comparison begins by using the same time period, because a one-year change cannot be fairly compared with a ten-year change without suitable adjustment. Next, the definition must be the same. Total population growth can involve births, deaths and migration, whereas natural increase generally compares births with deaths. Finally, the base population must be clear because a percentage depends on the starting number. A includes all three safeguards. B is wrong because different periods and an unclear base can distort the result. C is wrong because a percentage without its period, definition and denominator lacks meaning. D is wrong because migration may be part of total population growth and should not automatically be removed; it depends on the purpose of the comparison. Memory cue: same period, same meaning, same clear base.

Direct answer: A. A water crisis becomes more likely when water demand increases faster than the available supply. Rapid population growth adds more households and more users. People need water for drinking, cooking, sanitation and other activities; farms and industries may also require water. If rivers, groundwater, reservoirs or other sources are limited, they cannot easily meet unlimited demand. The result can be shortage, competition and pressure on water sources. A correctly connects a rising population with limited supply. B is wrong because a declining population and increasing sources generally reduce population-related pressure. C is wrong because no population means no human demand in this situation. D is wrong because zero demand cannot create a demand-based crisis. The option does not claim population growth is the only cause; climate, management and pollution may also matter. Memory cue: crisis grows when demand rises beyond supply.

Direct answer: A. Food security means that people can obtain sufficient, safe and nutritious food reliably. When population grows, the number of people needing food increases, so total demand generally rises. Meeting this demand requires more than simply producing crops. Planning may be needed for production, storage, transport, markets, prices and fair distribution, because food must reach people in different places and circumstances. A is correct because it connects increased demand with both production and distribution planning. B is wrong because population growth increases, rather than ends, the need for food. C is wrong because population size directly affects the number of consumers and therefore food planning. D is wrong because growth affects settlements, farms, markets, water and services in many places, not only mountains. Memory cue: food security requires food available and accessible.