Population Growth

Population growth means the change in the total number of people in a population during a specified period. It can be positive when the number rises, negative when it falls, or almost zero when increases and decreases balance each other. Births and deaths are important components, and migration may also affect the total, so growth is not the same as births alone.

The comparison must be made between population totals at two points in time or over a stated interval. Density is a different measure because it relates population to area. Therefore option A is correct. Options B and C describe only single demographic events, while option D describes spatial concentration rather than change in population size.

Natural population increase measures the change caused only by births and deaths. It is positive when births are more numerous than deaths, zero when they are equal, and negative when deaths exceed births. Migration is not included in natural increase, although it affects the total population change.

In this question, the condition for natural growth is therefore that births exceed deaths, making option B correct. If deaths exceeded births, natural change would be negative, so A is incorrect. When both are zero, natural change is zero, not an increase, and out-migration reduces total population rather than creating natural growth.

Population size changes through natural change and migration. Natural change equals births minus deaths. In this case, births and deaths are equal, so natural change is zero. The question also says there is no migration, meaning neither people entering nor people leaving adds a further change.

Thus the total population has approximately no net change, so option C is correct. “Approximately” allows for ordinary recording or timing differences, but under the stated model the size remains constant. Rapid growth would require more births than deaths or net in-migration; rapid decline would require more deaths than births or net out-migration. Doubling has no basis in the information given.

Natural growth considers only births and deaths, not migration. It is calculated as births minus deaths. When the number of deaths is greater than the number of births, this difference is below zero, so natural growth is negative. Therefore, the correct choice is D, “Deaths exceed births.”

For instance, if a population records 8,000 births and 10,000 deaths during a year, natural growth is \(8000-10000=-2000\). The population loses 2,000 people through natural change. In-migration could still make the total population rise, but it would not make natural growth positive because migration is excluded from that measure. Equal births and deaths produce zero natural growth, while births exceeding deaths produce positive natural growth.

A region’s total population changes through births, deaths, and migration. Migration means people entering or leaving the region. Therefore, even if the number of births and deaths stays exactly the same, an inflow can increase the population and an outflow can reduce it. This is why migration is a demographic component separate from natural change, which is calculated from births minus deaths.

Option A is correct. Soil fertility, rainfall, and altitude may influence where people live or how attractive a place is, but they do not directly add or remove people from the region in the demographic accounting sense. The question asks specifically what can change the total without changing births or deaths, so the movement of people across the region’s boundary is the clear answer.

In-migration means movement of people into a particular region from another place, usually with the intention of living there. The word “in” indicates movement toward the region. If the number entering is greater than the number leaving, and births and deaths are unchanged, in-migration increases the region's population. People may move for work, education, safety, family reasons, or better services.

Thus, option B is correct: people enter and settle in a region. Option A describes out-migration, which is movement away. Options C and D are natural demographic changes, not migration, because they do not involve people changing their place of residence. In-migration concerns direction of movement, not birth or death rates.

Out-migration means movement away from a particular area to another place. The people who leave may move to another village, city, region, or country for work, education, safety, family reasons, or other purposes. In population studies, the area they leave is the area of origin. If more people leave than enter, and births and deaths do not offset the difference, the origin area’s population may decline.

Therefore, option C is correct because it directly describes people leaving one region for another. Option A is the opposite process and refers to in-migration or inflow. An increase in births and a fall in death rate are components of natural population change, not migration. The term concerns movement across a place boundary, whether the movement is temporary or permanent; its classification can depend on the duration and scale being studied.

Natural increase measures the change produced only by births and deaths. It is calculated by subtracting the number of deaths from the number of births: \(800-500=300\). Therefore, the region has a natural increase of 300 people, so option D is correct.

Migration is not included in this calculation. If 100 people entered or left the region, that would affect total population change, but it would not alter the natural increase calculated from births and deaths. The answer is an absolute number of people because the question gives counts, not rates. A rate would require a population base and usually a time period, neither of which is needed here.

Natural population change considers only births and deaths. It is calculated as births minus deaths, so migration is not included in this particular measure. A positive result means natural increase, while a negative result means natural decrease. The sign is important because it identifies the direction of change.

Here, natural change is \(600-750=-150\). Thus, there were 150 more deaths than births, producing a natural decrease of 150 people. Therefore, option A is correct. Adding births and deaths would give 1,350, but that total does not represent natural change because deaths must be subtracted from births.

The population growth rate expresses how quickly the size of a population changes during a stated period. It can show an increase or a decrease and is commonly written as a percentage relative to the population at the beginning of the period. The change may reflect births, deaths, immigration, and emigration, depending on the definition and data used.

Therefore, option B is correct: it is the pace of population change over a period. Total land area describes physical size, not growth. Population density compares people with area and is a different measure. The number of migrants may contribute to growth, but it is only one component and does not by itself equal the growth rate. A rate describes change relative to time and population size, not merely a count.

Absolute increase means the actual number added to the population, not the percentage increase and not the final population. It is calculated by subtracting the initial population from the final population. The initial value is 1 million and the final value is 1.1 million. Therefore, the increase is \(1.1-1.0=0.1\) million.

Since one million equals 1,000,000, 0.1 million equals 100,000. Thus option C is correct. The final population is 1,100,000, but that is not the increase. Similarly, 50,000 and 75,000 are smaller than the actual difference. Careful attention to the word absolute helps distinguish the added amount from a growth rate or a total population.

Percentage growth is calculated by dividing the increase by the initial population and multiplying by 100. The increase is \(220000-200000=20000\). Therefore, the percentage growth is \(20000\div200000\times100=10\) percent. The initial population must be used as the denominator, because percentage change measures the change relative to the starting value. Thus, option D is correct.

A useful check is that 10 percent of 200000 is 20000, exactly the number added. Using the final population as the denominator would answer a different question and give about 9.09 percent, which is not the standard growth percentage here. The values 5 percent and 8 percent are too small, while 9 percent results from an incorrect base. Hence, the correct answer is 10 percent.

A rapidly growing population is one whose total number increases quickly over a relatively short period. The statement describes the speed of change in population size; it does not directly describe changes in land area, density, or migration by every individual. Population growth may result from natural increase, which is births minus deaths, and may also be influenced by migration.

Thus option A gives the direct meaning: population size is increasing quickly in a short period. Option B changes the subject from people to land, while option C is not necessarily true because density can rise or fall depending on area. Option D is an extreme and unsupported claim.

Slow population growth means that the number of people is still increasing, but the increase happens at a relatively low rate. A population can add people every year while growing slowly. This differs from zero growth, where additions and losses balance, and from decline, where the total number falls. Births, deaths, and migration together influence the actual change.

Option B is correct because it says that population is increasing at a low speed or rate. Option A incorrectly says that slow growth must mean decline, option C treats slow growth as complete stability, and option D ignores births and migration. For example, a population rising from 1,000,000 to 1,005,000 is growing, even though the increase is small. The adjective “slow” describes the rate, not the direction.

Zero population growth means that the total population shows almost no net change over a period. It does not require births and deaths to stop. Births add people, while deaths remove people; migration may also add or remove people. When these additions and losses balance approximately, the population remains nearly stable.

Option C is correct because it describes this balance. For example, births may equal deaths when migration is absent, or a natural decrease may be offset by immigration. Thus zero growth does not mean rapid growth, that everyone is leaving, or that no births occur. The word “net” is important: separate demographic flows may continue even when their combined result is close to zero.

Natural increase measures the change produced by births and deaths, without including migration. In simple terms, it is the birth rate minus the death rate. A high birth rate adds many people, while a low death rate removes fewer people. If other conditions remain the same, the difference between births and deaths will therefore be positive and relatively large.

Consequently, natural increase will be high, so option D is correct. A negative natural increase would require deaths to exceed births. Population could still be affected by migration, but migration does not change the conclusion about natural increase itself. The wording asks about natural increase, not necessarily the final population after migration.

Natural increase is the difference between the number of births and the number of deaths in a population. If the birth rate remains unchanged but the death rate falls, fewer people are removed from the population through death. The gap between births and deaths can therefore become larger, causing natural increase to rise. This is a general demographic relationship, not an absolute prediction for every unusual situation.

Thus option A is correct: natural increase may rise. For instance, if births stay at 100 while deaths fall from 20 to 10, the difference rises from 80 to 90. A falling death rate does not automatically stop migration, make growth zero, or cause immediate population decline. The word “may” appropriately allows for other demographic circumstances.

If the death rate stays unchanged while the birth rate declines, fewer births are added to the population but deaths continue at the same level. The difference between births and deaths therefore becomes smaller. Natural increase may slow, reach zero, or become negative if births eventually fall below deaths. The correct choice is B.

Suppose the birth rate is 24 per 1,000 and the death rate is 8 per 1,000; natural increase is 16 per 1,000. If the birth rate falls to 14 while deaths remain 8, natural increase becomes 6 per 1,000. The population may still grow, but more slowly. A declining birth rate does not automatically make deaths zero or make the population immediately double, so options A, C, and D are incorrect.

Net migration compares the number of people entering a country with the number leaving it. It is calculated as in-migration minus out-migration. If more people enter than leave, this difference is positive, so the country has positive net migration. This is different from natural increase, which compares births and deaths.

The question states that in-migration exceeds out-migration. Therefore, the difference between the two flows is greater than zero, and the correct term is positive net migration. Option C is correct. Negative natural increase would mean deaths exceed births, while zero migration would require equal inflow and outflow.

Answer: D, negative. Net migration is calculated as in-migration minus out-migration. In-migration means people entering a region, while out-migration means people leaving it. If more people leave than enter, the subtraction gives a negative result. For example, if 400 people enter and 650 leave, net migration is 400 - 650 = -250, meaning a net loss of 250 people. A is wrong because positive net migration requires more arrivals than departures. B would occur only when arrivals and departures are equal. C is unnecessary because the relationship is clearly given. Memory cue: more people leaving than arriving means a negative migration balance.

Net migration measures the balance between people entering and people leaving a region. In-migration adds people to the population, while out-migration removes people. Therefore, net migration is calculated as in-migration minus out-migration. A positive result indicates a net increase; a negative result would indicate a net loss.

Here, the number entering is 1000 and the number leaving is 700. Thus, net migration is \(1000-700=300\). Since the result is positive, the region has an increase of 300 people due to migration. The total of 1700 is not the net value; it counts both flows without showing their balance. Therefore, option A is correct.

Answer: B, a decrease of 250 people. Net migration = in-migration - out-migration. Here, 400 people enter and 650 leave, so net migration = 400 - 650 = -250. The negative sign means that departures exceed arrivals and the region loses 250 people through migration. A reverses the direction of the balance. C adds the two flows, 400 + 650 = 1050, but that is total movement, not net migration. D uses an incorrect subtraction. The word ‘net’ means the balance after one flow is compared with the other. Memory cue: arrivals are positive and departures are subtracted; a negative answer means population loss through migration.

Total population change has three main components: births, deaths, and net migration. Births add people to the population, while deaths remove people. Net migration is the number entering minus the number leaving during the period. A country can therefore grow even with relatively few births if it receives many migrants, or it can lose population if deaths and outward migration together exceed births.

Option C is correct because it includes all three components needed for a complete demographic account. In simplified form, population change equals births minus deaths plus net migration. Births alone cannot explain movement caused by mortality or migration; deaths alone show only one reducing component. Land area is not a direct component of population change, although it may influence density and settlement. The conclusion is based on the demographic balance, not merely the number of births.

Total population change has two parts: natural increase and net migration. Natural increase is births minus deaths. Net migration is added when more people enter than leave, and it is subtracted when migration is negative. In this case, births exceed deaths by 300, and another 200 people are added through positive net migration. Therefore, the population increases by 500, so choice C is correct.

Calculate natural increase first: \(900-600=300\). Then include net migration: \(300+200=500\). Thus the total change is a gain of 500 people, not merely 300. Adding births, deaths, and migration without considering their signs would give an incorrect result such as 1700. Deaths reduce population, whereas births and positive net migration increase it.

Population change has two parts: natural change and migration change. Natural change equals births minus deaths. Here, births are 500 and deaths are 400, so natural increase is 100 people. Net migration is given as -200, and the negative sign means that 200 more people left than entered.

Total population change is natural increase plus net migration: \(500-400+(-200)=100-200=-100\). A negative result means the population decreased, not increased. Therefore option D, a decrease of 100, is correct. Choosing an increase of 100 would ignore migration, while choosing a decrease of 200 would ignore the natural increase of 100.