Processes of Population Change

Correct answer: A. Difference between people coming in and going out

Direct answer: Option A is correct. Migration means the movement of people from one place to another. In-migration counts people who enter a place, while out-migration counts people who leave it. Net migration is found by subtracting out-migration from in-migration: Net migration = people coming in − people going out. A positive result means more people entered than left; a negative result means more left than entered. Option A states this meaning accurately. Option B compares water bodies and has nothing to do with population movement. Option C compares natural materials, not people. Option D compares weather elements and is also unrelated. Net migration is one factor that can change the population of a place, along with births and deaths. Memory cue: “net” means the balance left after adding arrivals and subtracting departures.

Correct answer: A. The number of births and deaths is almost equal

The direct answer is A: natural increase is near zero when the number of births is almost equal to the number of deaths. Natural increase measures the change produced by births and deaths only; it does not include migration. In a simple form, natural increase = births − deaths. If births and deaths are nearly equal, the difference is close to zero. B would usually produce a positive natural increase because births exceed deaths. C describes out-migration, which affects total population but not natural increase. D is incomplete and concerns migration rather than the birth–death balance. Memory cue: natural means births minus deaths; migration is separate.

Correct answer: A. Births add new individuals to the population

Direct answer: A. A birth adds one new person to the population of a place. To understand population change, begin with the existing population, add births and in-migrants, and subtract deaths and out-migrants. If births are high and other factors remain unchanged, the population tends to grow. A is correct because birth is an addition to population size. B reverses the effect of birth; a birth does not remove a person. C is wrong because births change the number of people, not the physical area of a region. D is wrong because births do not end deaths or make the death rate zero. Memory cue: births are added, deaths are subtracted.

Correct answer: A. Because it is linked with the number or rate of new births

Direct answer: A. Birth rate describes the number of live births in a population during a stated period, usually in relation to the population size. Births add people to a population, so they are one of the main factors behind population change. Step by step: begin with the existing population; add the people born during the period; compare the new total with the old total. If births are high and other factors remain similar, population growth is more likely to be high. Option A is correct because it connects birth rate with new births. B is wrong because mountain height is a physical-geography measurement. C is wrong because river direction concerns drainage and relief. D is meaningless for demography. Memory cue: births add; deaths subtract.

Correct answer: A. Births and in-migrants equal deaths and out-migrants

Direct answer: A. Population remains stable when total additions equal total removals. Additions include births and in-migration, while removals include deaths and out-migration. The relationship can be written as: population change = births + in-migrants − deaths − out-migrants. In option A, the two sides balance, so the net change is zero. People may still be born, die, arrive or leave; stable does not mean that no event occurs. B would usually produce growth because additions exceed removals. C would empty the area rather than keep its population stable. D would usually produce decline unless an unusual, balancing migration pattern were also present, which the option does not state. Memory cue: stable means total in = total out.

Correct answer: A. Births, deaths and migration

Direct answer: Option A is correct. Population change is directly determined by three main demographic processes: births, deaths, and migration. Births add people to a population, while deaths remove people. Migration changes the population of a particular area because people may enter it or leave it. In simple form, population change depends on births minus deaths, together with the balance between people entering and leaving. If additions are greater than removals, population grows; if removals are greater, it declines; and if they balance, it may remain stable. Option B may influence settlement indirectly in some places, but mountain height itself is not the direct demographic calculation. Options C and D are sensory descriptions and do not measure population change. Memory cue: births add, deaths subtract, migration moves people in or out.

Correct answer: A. Rapid

Direct answer: A, rapid. Population changes naturally according to the relationship between births and deaths. If many people are born and relatively few people die, births are greater than deaths. The difference is a positive natural increase, and it is usually large when the birth rate is high and the death rate is low. Migration can also affect the total change, but it does not make the basic conclusion impossible. B is wrong because growth is not zero when births exceed deaths. C is wrong because positive growth is possible under these conditions. D is wrong because negative growth generally requires deaths to exceed births or strong outward migration. Memory cue: high births plus low deaths usually means fast natural increase.

Correct answer: A. Living conditions may improve and the death rate may fall

Direct answer: A. Adequate and nutritious food supports physical development, health, and the ability to resist undernourishment. When food availability improves, living conditions may become better and deaths related to hunger or poor nutrition may decrease. A lower death rate can influence population growth, particularly if the birth rate remains higher than the death rate. This is a possible effect, not an automatic result in every area, because healthcare, sanitation, fertility, and migration also matter. B is wrong because food availability cannot make a population zero. C is wrong because food does not stop births. D is wrong because people can still move between places. Memory cue: adequate food supports survival and may lower mortality.

Correct answer: A. The birth rate being higher than the death rate

Direct answer: A. Natural population change can be understood by subtracting deaths from births. When the birth rate is higher than the death rate, more people are added through births than removed through deaths, producing a positive natural increase. If migration does not reverse this effect, the total population will tend to grow. B is wrong because a much higher death rate produces a negative natural balance. C is wrong because everyone leaving the area would reduce its population, not increase it. D is wrong because without births no new people are added through this process. Migration must also be considered when measuring total change, but the basic relationship remains: births greater than deaths support population increase. Memory cue: births minus deaths positive = natural growth.

Correct answer: A. People coming into an area

The direct answer is A: people coming into an area. Immigration is the movement of people into a country, region or other area from outside, usually with the intention of living there. Always identify the place being discussed: movement toward that place is immigration for that place. Option A is correct because it states the inward direction. Option B is wrong because people leaving an area are emigrating from that area; this is the opposite direction. Option C is wrong because the number of births is a demographic event, not movement between places. Option D is wrong because the number of deaths measures mortality, not migration. For example, a person moving from one region to another is an immigrant in the region entered and an emigrant from the region left. Memory cue: immigration means in-migration—people come in.

Correct answer: A. Population may increase

The direct answer is A: population may increase. Immigration adds people to an area, while emigration removes people from it. If many people enter and comparatively few leave, the area has positive net migration. Step by step, count the inward movement, subtract the outward movement, and note that the migration balance is positive. If births and deaths are also considered, the total population change depends on all these factors, so “may increase” is the careful answer. Option A is correct. Option B is wrong because high immigration and low emigration do not by themselves imply a decrease. Option C is wrong because incoming people cannot make the population automatically zero. Option D is wrong because migration does not end births. Memory cue: more in than out usually adds people.

Correct answer: A. Population may decrease

The direct answer is A: population may decrease. Emigration takes people out of an area, while immigration brings people in. When many people leave and only a few enter, net migration is negative. If the effects of births and deaths do not offset this loss, the total population can fall. Option A is correct because it describes the likely effect without claiming that it must happen in every situation. Option B is wrong because high outward movement and low inward movement do not guarantee population growth. Option C is wrong because migration cannot make a population infinite. Option D is wrong because population movement does not automatically change the physical area of a region. Births, deaths and migration together determine population change. Memory cue: more out than in usually subtracts people.

Correct answer: A. A change in birth rate and death rate

Direct answer: A, a change in the birth rate and death rate. Population growth depends on how many people are added through births and how many are removed through deaths. If births increase, more people are added and growth may become faster. If deaths decrease, fewer people are removed and growth may also become faster. Conversely, fewer births or more deaths can slow growth. Option A is correct because birth and death rates directly affect the natural change in population. Option B is wrong because the number of stones does not add people or remove them. Option C is wrong because cloud shape does not directly determine population growth. Option D is wrong because road colour has no demographic meaning. Remember: births add, deaths subtract; the balance affects growth speed.

Correct answer: A. The process of addition to and reduction of population

Direct answer: A, the process of addition to and reduction of population. Population changes when people are added through births or in-migration and when people are removed through deaths or out-migration. In simple form: population change equals additions minus reductions. If additions are greater than losses, population grows; if losses are greater, it declines; if they are balanced, it may remain stable. Option A is correct because it includes the main demographic processes behind change. Option B is wrong because climate has no colour that directly measures population growth. Option C is wrong because forest size alone does not count people entering or leaving. Option D is wrong because road width is an infrastructure feature, not a population process. Memory cue: count who comes in and who goes out, including births and deaths.

Correct answer: A. The population may increase

Direct answer: A, the population may increase. Population changes through births, deaths, people entering, and people leaving. High births add many people, while few people leaving means the loss through out-migration is small. Therefore, the population can rise if additions are greater than deaths and other losses. The word “may” is important because the question does not give complete information about deaths or people entering. Option A is correct because the stated conditions favour an increase. Option B is wrong because they do not show a certain decrease. Option C is wrong because these conditions cannot make a population zero. Option D is wrong because a death rate is a measured rate, not an infinite result, and it is not the same as population growth. Remember to compare all additions and losses before making an absolute claim.

Correct answer: A. Population growth may increase

Correct answer: A. Population growth depends partly on the balance between births and deaths. If the birth rate stays unchanged but the death rate falls, fewer people are being lost through death while births continue at the same level. Therefore, the difference between births and deaths can become larger, causing natural increase and overall population growth to rise. The word “may” is important because migration and other conditions can also affect the total population. B is wrong because a lower death rate cannot make the population zero. C is wrong because death rate and birth rate are separate measures; reducing deaths does not stop births. D is wrong because population processes do not automatically change the physical area of a region. Remember: same births plus fewer deaths generally means faster natural growth.

Correct answer: A. Change caused by births and deaths

Correct answer: A. Natural change, also called natural increase or natural decrease depending on its direction, is the population change produced by births and deaths. It is found by comparing the number of births with the number of deaths during a period: births minus deaths. If births are greater, there is natural increase; if deaths are greater, there is natural decrease. Migration is not included in this natural component. B is wrong because people moving out is emigration, a migration process. C is wrong because road construction is an economic or infrastructural activity. D is wrong because rainfall is a climatic factor. The memory cue is: natural change comes from events occurring naturally in the population—births and deaths—not from movement between places.

Correct answer: A. Net change due to migration will be low or zero

Correct answer: A. Immigration means people enter an area, while emigration means people leave it. Net migration is calculated as immigration minus emigration. If the numbers entering and leaving are equal, the difference is zero, so migration itself causes no net increase or decrease in the area’s population. The total population can still change because births and deaths may not be equal. B is wrong because equal inflow and outflow do not automatically double population. C is wrong because migration does not end the biological event of birth. D is wrong because migration cannot make the death rate infinite. A memory cue is: equal in and out means balance; count the difference, not the movement on each side.

Correct answer: B. Net migration

Direct answer: B, net migration. Population can increase in two broad ways: natural increase, which is births minus deaths, and net migration, which is immigrants minus emigrants. Here the birth rate is low, so births are not the main reason for the city’s increase. A large inflow of students and workers means more people enter the city than leave it, creating positive net migration. A is not the best answer because natural increase may be small or even negative when the birth rate is low. C cannot be a cause of growth; a higher death rate normally reduces population. D is only one component of natural change and is specifically described as low. Memory cue: people born there affect natural increase; people moving there affect net migration.

Correct answer: A. Immigration

The correct answer is A: immigration. Immigration occurs when people enter an area from another place to live or work there. A development project may attract workers quickly, so the area's population can rise in the short term even before births increase. Option A therefore identifies the immediate population-change component. Option B, death rate, measures deaths and cannot describe workers arriving. Option C, birth rate, concerns births; it may affect population over a longer period but is not the direct event described. Option D, natural decrease, occurs when deaths exceed births and would reduce population. A useful distinction is that immigration is an inflow, while emigration is an outflow. Memory cue: people coming in = immigration; people going out = emigration.

Correct answer: A. Births and deaths

The correct answer is A: natural increase is related to births and deaths. In demography, natural increase is calculated as births minus deaths during a period. If births are greater than deaths, natural increase is positive; if deaths are greater, it is negative. Migration is not included in natural increase, although it is included when calculating total population change. Option A is correct because it names the two processes that determine the natural balance. Option B concerns physical materials, not demographic events. Option C names water features and does not measure births or deaths. Option D describes cultural characteristics, not the natural component of population change. A common confusion is to treat migration as natural increase. Memory cue: “natural” means change through birth and death, without movement across a boundary.

Correct answer: B. 200

Direct answer: B, 200. Natural increase is calculated from births and deaths only; migration is not included. Write the figures in the formula: natural increase = number of births − number of deaths. Therefore, 500 − 300 = 200. The positive result means births are greater than deaths by 200, so the population has a natural increase of 200 people during the stated period. Option A is wrong because 100 does not result from the given subtraction. Option B is correct because it follows the formula exactly. Option C is wrong because 300 is the number of deaths, not the difference. Option D is wrong because adding births and deaths gives 800, but that is not natural increase. If rates are given instead of numbers, the same subtraction idea is used. Memory cue: births add, deaths subtract; do not add both.

Correct answer: C. Zero

Direct answer: C, zero. Use the basic formula: natural increase = births − deaths. Here the calculation is 700 − 700 = 0. Births and deaths are equal, so births do not exceed deaths and deaths do not exceed births. The population therefore has no natural increase or natural decrease from these figures. Option A is wrong because rapid growth requires births to be clearly greater than deaths. Option B is wrong because a negative result would occur only when deaths were greater than births. Option C is correct because equal quantities have a difference of zero. Option D is wrong because there is no positive balance. This calculation does not include migration; migration could still change the total population, but it does not change the natural increase calculated here. Memory cue: equal births and deaths balance at zero.

Correct answer: D. Decrease of 200

Direct answer: D, a decrease of 200. Natural change is found by subtracting deaths from births: 400 − 600 = −200. The minus sign is important. It shows that deaths exceed births by 200, so the area experiences a natural decrease of 200 people during the period. Option A is wrong because it reverses the direction and treats the difference as an increase. Option B is wrong because adding 400 and 600 gives 1000, not natural change. Option C is wrong because births and deaths are not equal. Option D is correct because it states both the size and direction of the change. This answer concerns natural change only; migration could separately increase or decrease the total population. Memory cue: when deaths are higher, the natural balance is negative.

Correct answer: A. 60

Direct answer: A, 60. Net migration measures the balance between people entering and people leaving an area during a stated period. Use the formula: net migration = in-migrants − out-migrants. Thus, 100 − 40 = +60. The positive sign means that 60 more people entered than left, so migration contributed a population gain of 60. Option A is correct. Option B gives only the number who left, not the balance. Option C gives only the number who entered. Option D adds the two flows and gives total movement, but total movement is not net migration. The calculation assumes the figures refer to the same area and period. Memory cue: incoming minus outgoing gives the net balance.