Population Growth

Correct answer: A. Change in population size over a period

Population growth means the change in the size of a population during a stated period, such as a year or a decade. The total change depends on births and deaths within the population and on migration across the area’s boundary. In simple terms, growth may be positive when additions exceed losses, or negative when losses exceed additions.

Counting births alone gives only one component and ignores deaths and migration. Counting migrants alone also misses natural change. Population density is a measure of people per unit area, not the change in population size. Therefore option A is correct: population growth refers generally to change in population size over a period.

Correct answer: B. Positive

Natural increase measures population change produced by births and deaths alone. Its formula is \(\text{natural increase} = \text{births} - \text{deaths}\). Since births are greater than deaths in this case, the difference is above zero. Ignoring migration is important because migration belongs to overall population change but not to natural increase.

Therefore, option B, positive, is correct. Natural increase would be zero only if births equalled deaths, and it would be negative if deaths exceeded births. The exact numerical rate cannot be calculated without figures, but its direction is clear from the comparison given.

Correct answer: C. Births equal deaths

Natural population growth counts only the balance between births and deaths. It can be written as \(Natural\ growth = Births - Deaths\). If births and deaths are equal during a period, their positive and negative contributions cancel, so natural growth is zero. This does not necessarily mean that the total population remains unchanged, because migration may still add or remove people.

Option C is correct because equal births and deaths produce no natural increase or decrease. If births exceed deaths, natural growth is positive; if deaths exceed births, it is negative. Zero migration is a different idea: it affects total population change but is not the definition of natural growth. Therefore the equality of births and deaths, not the absence of migration, gives the correct answer.

Correct answer: B. Population growth

Population growth means an increase in the total number of people over a specified period. Here the population rises from 50 million to 51 million, so it increases by 1 million. The change may result from births, deaths, immigration, emigration, or a combination of these, but the information given does not identify the exact cause. It nevertheless clearly shows that the total population has grown.

Therefore, option B is correct. Population density could rise or fall depending on whether the area also changed, so option A cannot be concluded. The figure does not prove that the increase came only from migration, making option C too narrow. Population distribution describes where people are located, not simply the fact that the total number increased. The direct conclusion is population growth.

Correct answer: A. Births, deaths and migration

Population change is produced by three direct demographic components: births, deaths, and migration. Births add new members to a population. Deaths remove members. Migration changes the population when people move in or out: immigration increases the population of a place, while emigration decreases it. The balance of these processes determines whether population grows, falls, or remains nearly stable.

Option A is correct. A useful expression is: population change = births − deaths + immigration − emigration. Rainfall, temperature, soil, industry, roads, ports, altitude, latitude, and slope can influence where people live and how demographic processes occur, but they are not the three direct components of population growth. Thus B, C, and D list influencing conditions or physical features rather than the required demographic components.

Correct answer: B. Immigration

When people move into a country or region from another place, the destination describes this movement as immigration. Such arrivals can add to the destination’s population, although the final change also depends on departures and deaths. The same movement can be called emigration from the viewpoint of the place people leave.

Therefore, option B is correct. The question asks about movement into a region, so the destination-based term is immigration. Natural increase means the balance between births and deaths, not movement between places. A death rate measures deaths in a population and is not a name for migration. Keeping the viewpoint in mind prevents confusion between immigration and emigration.

Correct answer: C. Emigration

The movement of people out of their country or region of origin is called emigration. The word is used from the viewpoint of the place that people leave. For example, if residents leave Region X to settle elsewhere, their movement is emigration for Region X. It can reduce the population of the origin area and may also change its age or working-population structure.

Thus option C, emigration, is correct. Immigration has the opposite viewpoint: it means entering a new country or region. Population growth is a change in the number of people and is not itself a name for outward movement. Natural increase refers to births minus deaths, so it does not describe migration. Remembering the direction is useful: emigration means exiting, while immigration means entering.

Correct answer: A. Positive

Net migration measures the balance between people entering a country and people leaving it. It can be written as net migration = immigration − emigration. When the number entering is greater than the number leaving, the difference is above zero. This means migration adds people to the country’s population, assuming the figures are measured for the same period.

Therefore, option A, positive, is correct. Negative net migration would occur if emigration exceeded immigration, while zero would occur if the two numbers were equal. Net migration is different from natural increase, which depends on births and deaths. Thus the result concerns movement across borders, not the birth rate or death rate.

Correct answer: C. Negative

Net migration compares the number of people entering a region with the number leaving it. It can be represented as \(\text{immigration}-\text{emigration}\). When emigration is greater than immigration, more people leave than arrive, so the result is below zero. This is called negative net migration and indicates that migration is reducing the population of the region, even though births and deaths may affect the total population separately.

Therefore, option C, negative, is correct. Net migration is zero only when arrivals and departures are equal. It is positive when immigration exceeds emigration. The term “double” does not describe the sign of a migration balance. A region with negative net migration could still experience overall population growth if natural increase is large enough, but the migration component itself is negative.

Correct answer: C. Migration

Natural population increase measures the change produced by births and deaths within a population. It is calculated as births minus deaths, often expressed for a specified period. If births are greater than deaths, the natural increase is positive; if deaths are greater, it is negative. This measure does not include people entering or leaving through migration, because migration changes population size through movement rather than through vital events.

Option C is therefore correct: migration is not a component of natural increase. Option D describes the calculation itself, while options A and B are the two vital events used in it. Total population change can include both natural increase and net migration, but those are separate components. Confusing migration with natural increase would make it impossible to distinguish demographic change caused by births and deaths from change caused by movement.

Correct answer: B. 300000

Natural increase measures the change produced by births and deaths alone. When migration is excluded, it is calculated by subtracting the number of deaths from the number of births: \(\text{natural increase}=\text{births}-\text{deaths}\). Births add people to the population, whereas deaths remove people. Migration would be included separately when calculating total population change.

Here the calculation is \(800000-500000=300000\), or 3 lakh people. Therefore, option B is correct. Adding births and deaths would give 1.3 million, but that does not represent population increase because deaths do not add people. The result is positive because births exceed deaths during the year.

Correct answer: C. Zero

Natural increase measures only the change produced by births and deaths. Its formula is \(Natural\ increase = Births - Deaths\). Migration is not included in this particular measure. In the situation given, the number of births is 400,000 and the number of deaths is also 400,000. Since the two values are equal, their difference is zero.

Therefore, option C, zero, is correct. The figure 800,000 would be the total of births and deaths, not the increase in population. A natural increase of zero does not necessarily mean that the total population remained unchanged, because immigration or emigration could still alter it. It means only that births and deaths made equal contributions during the stated year.

Correct answer: B. Decrease of 100000

Population change from natural causes is calculated by subtracting deaths from births. Migration would normally also affect total change, but the question states that there is no migration. Therefore only the balance between births and deaths must be considered. If deaths exceed births, the result is negative, which indicates a decline rather than an increase.

The calculation is \(600000 - 700000 = -100000\). The negative sign means that 100000 more people died than were born. With no arrivals or departures to alter the total, the country's population decreases by 100000, or one lakh. Thus option B is correct. The figures should not be added, because births and deaths have opposite effects on population size.

Correct answer: A. 5 million

Absolute population growth is the actual numerical change in population, not the percentage change. It is found by subtracting the initial population from the final population. Here the initial population is 100 million and the final population is 105 million, so the difference is \(105-100=5\) million.

In Indian counting units, 100 million equals 10 crore and 5 million equals 0.5 crore, or 50 lakh. Therefore, the absolute growth is 0.5 crore, making option A correct. The final population of 105 million is not the amount of growth; it is the total population after the increase. Percentage growth would be a different calculation, but the question asks only for the absolute increase.

Correct answer: B. Negative

Population growth compares the population at the end of a period with the population at its beginning. If the later population is smaller, the change is below zero and is called negative population growth. This describes a decline, not a doubling or a permanently positive trend. The term refers to the direction of change, whether the decline is caused by natural decrease, out-migration, or both.

Thus, if a region's population decreases, its population growth is negative. Option B is correct. Positive growth would mean that the population increased overall. A decline may occur when deaths exceed births, when more people leave than enter, or when both conditions occur together. The question asks for the sign and description of the change, so no numerical rate is required.

Correct answer: B. Proportion of population change over a period

Population growth rate expresses the change in population relative to the population at the beginning of a specified period. It may show an increase or a decrease and is commonly written as a percentage. A simple form is \(\frac{\text{new population}-\text{initial population}}{\text{initial population}}\times100\). The time period must be stated or understood for the rate to have meaning.

Option B is correct because it describes the proportion of population change over a period. Total area is a geographical measurement, not a growth rate. The number of males and the number of rural residents are population counts or classifications, not the overall rate of change. Growth may result from births, deaths, and migration, depending on the definition being used, so the rate should not automatically be confused with only the birth rate. The key idea is change compared with the starting population.

Correct answer: B. Country with 2 percent

Population growth rate measures the percentage change in population during a stated period. When the comparison period and definitions are the same, a rate of 2 percent represents a faster proportional increase than a rate of 1 percent. This comparison concerns the speed relative to each country's own starting population, not necessarily the number of additional people in absolute terms.

Therefore, the country with a 2 percent growth rate is growing faster, so option B is correct. A country with a larger population could add more people even at 1 percent, but that would not change which rate is faster proportionally. The question asks about growth rate, and 2 percent is greater than 1 percent.

Correct answer: A. Population may grow rapidly

Natural population change depends on the difference between births and deaths. When the birth rate remains high and the death rate falls, more people are added through births than are removed through deaths. This produces a larger natural increase. If migration does not cancel it and other conditions are broadly similar, the total population can grow rapidly.

Thus option A is correct. Improved health care, sanitation, nutrition, and disease control can lower mortality, but the key reasoning is simply that a wide positive gap between births and deaths adds people quickly. The population does not immediately decline or necessarily remain stable. Migration is a separate component of population change, so a falling death rate does not itself stop migration.

Correct answer: B. Growth rate falls

Population growth from natural change depends mainly on the difference between births and deaths. If the death rate stays nearly the same but the birth rate falls, fewer people are being added while roughly the same number are being removed. The gap between births and deaths therefore becomes smaller, so the natural growth rate generally declines.

Option B is correct. Population may still increase for some time if births remain greater than deaths, but it will grow more slowly. If migration is included, migration can alter the total change, yet the question asks about the general effect of the birth-rate decline. Option A reverses the relationship, C ignores the changed birth rate, and D is an unsupported immediate result.

Correct answer: A. Population growth may accelerate

Population change depends partly on the balance between births and deaths. If the birth rate stays high while the death rate falls, the number of births is still large but fewer people die. The gap between births and deaths therefore becomes larger, assuming other relevant conditions do not offset it. This can raise natural increase and may make total population grow more quickly.

Thus option A is correct: population growth may accelerate. The word “may” is appropriate because migration, age structure, or other factors could affect the final total. The population will not automatically halve, natural increase will not become zero, and a lower death rate does not end migration. Those choices do not follow from the stated demographic change.

Correct answer: A. Net migration is positive

Natural increase is the difference between births and deaths. If it is zero, births and deaths are equal, so births alone do not add to the population. Total population also changes through migration. When the number entering a country is greater than the number leaving it, net migration is positive and adds people to the existing population.

For example, equal births and deaths could leave the resident population unchanged before migration is counted. If 100,000 more people enter than leave, the total population rises by 100,000. Deaths exceeding births, high emigration or no immigration would not produce the stated growth. Therefore, option A is correct.

Correct answer: A. Total population may decline

Population change can be understood through natural increase and net migration. Natural increase equals births minus deaths. Here births and deaths are equal, so natural increase is zero. If many more people leave the country than enter it, net migration is negative. Total population change is natural increase plus net migration; zero combined with a negative value gives a decline. Therefore, option A is correct.

The word “may” is appropriate because the exact result depends on migration numbers. If people leaving are balanced by new arrivals, population could remain stable. But under the stated condition of large out-migration without equal immigration, the population is likely to fall. Equal births and deaths do not protect total population from migration-related decline.

Correct answer: B. 1 percent

Annual growth rate compares the increase during one year with the population at the beginning of that year. The formula is \(Growth\ rate=\frac{Increase}{Initial\ population}\times100\). The initial population is 2 million, or 2,000,000, and the increase is 20,000. Thus \(\frac{20000}{2000000}\times100=1\%\).

Therefore option B is correct. Another simple observation is that 20,000 is one hundredth of 2,000,000, so it represents 1 percent. The rate is not 0.1 percent, because that would correspond to only 2,000 people; it is not 10 or 20 percent, which would mean much larger increases. The calculation assumes the stated one-year increase is measured against the initial population.

Correct answer: B. 200000

Absolute increase means the actual number of people added, not the percentage increase. It is calculated by subtracting the initial population from the final population. Here the population rises from 5 million to 5.2 million, so the difference is \(5.2-5.0=0.2\) million. Since 0.2 million equals 200,000, the correct choice is B: 200,000 people, or 2 lakh.

The final population, 5.2 million, is not itself the increase; it is the total population after growth. Similarly, 100,000 and 500,000 do not equal the difference between the two given values. The calculation concerns only the change during the period: final value minus initial value. Therefore, 2 lakh is the absolute increase.

Correct answer: A. Population growth rate

Doubling time is the period required for a population to become twice its initial size. It is mainly determined by the rate at which the population grows. When growth is rapid, the population reaches twice its size sooner; when growth is slow, doubling takes longer. Births, deaths, and migration may all influence the growth rate used in a particular study.

Therefore, option A, population growth rate, is correct. In a simple constant-growth model, doubling time is often estimated by the rule of 70 divided by the annual percentage growth rate, though this is an approximation. Country area, distance from the sea, and elevation do not directly determine doubling time.