Population Growth

Correct answer: A. Positive

Direct answer: A, positive. Net migration is calculated as the number entering an area minus the number leaving it. Suppose 900 people enter and 600 leave: 900 − 600 = +300. Because the result is above zero, net migration is positive, and migration alone tends to add people to that area. A is correct. B would apply if more people left than entered. C would apply only when the numbers entering and leaving were equal. D is wrong because the comparison in the question gives enough information to determine the sign, even though exact numbers are not given. This does not automatically tell us the area’s total population growth, because births and deaths also matter. Memory cue: more in than out gives a plus sign.

Correct answer: B. Negative

Direct answer: B, negative. Use the formula net migration = in-migration − out-migration. If more people leave than enter, the second number is larger, so the subtraction gives a value below zero. For example, 200 entrants and 500 leavers give 200 − 500 = −300. B is correct because the net balance is negative and the area loses people through migration. A would require more entrants than leavers. C would require equal numbers in both directions. D is not a meaningful fixed result; a negative value may have a small or large magnitude depending on the numbers. This result describes migration balance only; births and deaths must also be considered for total population growth. Memory cue: more out than in means a minus sign.

Correct answer: C. Growth = Births − Deaths + Net Migration

Direct answer: C. Population growth, understood as the change in population during a period, has two broad parts: natural change and migration balance. Natural change is births minus deaths. Net migration is people entering minus people leaving. Combining them gives population growth = births − deaths + net migration. C is correct because it includes additions from births and arrivals and removals from deaths and departures. A is wrong because area and rainfall are geographical factors, not the population-change formula. B is not a demographic calculation. D has no population meaning. For example, 100 births, 60 deaths, and net migration of +20 give growth of 100 − 60 + 20 = 60 people. Remember the structure: natural increase plus net migration.

Correct answer: A. Increase in the actual number

The direct answer is A: absolute increase shows the increase in the actual number of people. To understand it, compare the population at the end of a period with the population at the beginning. Subtract the earlier population from the later population: absolute increase = final population − initial population. The result is expressed as a number of people, such as 5 lakh or 2 million, not as a percentage. Option A is correct because it describes the real numerical change. Option B is wrong because percentage shows relative change, not the actual number added. Option C is wrong because area measures land, not population change. Option D is wrong because sex ratio compares females and males. Memory cue: absolute means the actual amount added.

Correct answer: B. 5 lakh

The direct answer is B: 5 lakh. Absolute increase means the amount added to the original population. Identify the final population, 25 lakh, and the initial population, 20 lakh. Now subtract the initial value from the final value: 25 lakh − 20 lakh = 5 lakh. Therefore, the population has increased by 5 lakh people. Option A is wrong because 3 lakh is not the difference between the two given numbers. Option B is correct because it is the exact numerical increase. Option C is wrong because 20 lakh is the initial population, not the increase. Option D is wrong because 25 lakh is the final population, not the amount added. Do not add the two values or use a percentage when the question asks for absolute increase. Memory cue: new minus old gives the amount of increase.

Correct answer: C. 3 lakh

The direct answer is C: 3 lakh. The wording asks for the increase, so find the difference between the new population and the old population. The new population is 18 lakh and the old population is 15 lakh. Calculate step by step: 18 lakh − 15 lakh = 3 lakh. Thus, 3 lakh people were added. Option A is wrong because the difference is not 1 lakh. Option B is wrong because subtracting 15 from 18 does not give 2. Option C is correct because it is the exact absolute increase. Option D is wrong because 18 lakh is the total population after the increase, not the number added. If the question asked for percentage growth, the calculation would be (3 ÷ 15) × 100 = 20%, but that is a different measure. Memory cue: absolute increase is new total minus old total.

Correct answer: D. To make comparison between different areas easier

The direct answer is D: a percentage makes comparison between different areas easier. A growth rate compares the change with the starting population. For example, an increase of 10,000 people may be large for a small town but small for a very large city. Expressing the change as a percentage puts both areas on a common basis. Option A is wrong because mountain height is measured using units such as metres, not population growth percentage. Option B is wrong because river direction is unrelated to population rate. Option C is wrong because writing a rate as a percentage does not stop births; it only describes change. Option D is correct because percentages allow fairer comparison between populations of different sizes. Memory cue: percentage means ‘out of 100’, so it helps compare unlike-sized groups.

Correct answer: A. The rate at which population changes over a given period

The direct answer is A: population growth rate indicates how quickly the population changes during a specified period. The word ‘rate’ tells us to think about the speed or extent of change over time. It may describe an increase or, in some situations, a decrease. Option A is correct because it includes both change and a time period. Option B is wrong because the total number of people is the population size. Option C is wrong because people per square kilometre is population density, which relates population to area. Option D is wrong because females per 1,000 males is the sex ratio. These terms describe different population features and should not be mixed. Memory cue: growth rate means change through time; density means people per area; sex ratio means females compared with males.

Correct answer: A. For planning future needs

The direct answer is A: studying population growth helps plan future needs. When population changes, the demand for schools, hospitals, houses, jobs, food, water, transport, and other services may also change. Governments and communities can use population information to estimate how many facilities and resources may be needed and where they should be provided. Option A is correct because planning is a major practical use of population data. Option B is wrong because book colour has no necessary connection with population trends. Option C is wrong because population study does not remove mountains. Option D is wrong because river names are unrelated to population planning. A careful answer says population study supports planning; it does not guarantee that every plan will succeed. Memory cue: know the people today to prepare services for tomorrow.

Correct answer: A. Pressure on services may be lower

The direct answer is A: pressure on services may be lower. If population grows more slowly, governments and communities may have more time to expand schools, hospitals, housing, water supply, transport, and employment opportunities in line with demand. This does not mean that all problems disappear, but the pace of additional demand may be easier to manage. Option A is correct because it states a possible, not guaranteed, benefit. Option B is wrong because slow growth does not mean schools must close. Option C is wrong because slow growth is not the same as an immediate fall to zero. Option D is wrong because people will still need water. The word ‘may’ is important because outcomes depend on resources, policies, and local conditions. Memory cue: slower growth can give planning more time.

Correct answer: A. Because more children need education

The direct answer is A: more children may need education. When the number of people grows, the number of children in a community may also increase. These children need classrooms, teachers, books, furniture, toilets, and safe places to learn. Therefore, governments may need to build new schools, add classrooms, or increase staff. Option A is correct because it gives the direct link between population growth and educational demand. Option B is wrong because a river becoming longer does not determine how many students need schools. Option C is wrong because changes in mountains do not explain school enrolment. Option D is wrong because soil conditions may affect farming or land use, but they do not directly create demand for classrooms. The word ‘may’ is appropriate because age structure and local conditions differ. Memory cue: more school-age children usually mean greater education needs.

Correct answer: A. Their need may increase

The direct answer is A: the need for health services may increase. A larger population can mean more people needing doctors, nurses, medicines, hospitals, vaccination, maternal care, and emergency treatment. If facilities do not expand along with the population, existing services may face greater pressure, such as crowded hospitals or longer waiting times. Option A is correct because it describes the likely planning need without claiming that the same effect occurs everywhere. Option B is wrong because people continue to need healthcare even when population growth is high. Option C is wrong because health services cannot become mountains. Option D is wrong because health services do not stop rivers. The effect depends on age structure, disease patterns, income, and availability of facilities, but increased demand is a sensible general conclusion. Memory cue: more people can mean more users of public services.

Correct answer: A. By increasing awareness and understanding of family planning

The direct answer is A: education can increase awareness and understanding of family planning. Education helps people learn about health, informed decision-making, the consequences of family size, and the availability of family-planning choices. It can also improve communication and help people make decisions based on reliable information. Option A is correct because it identifies awareness and informed choice as important pathways. Option B is wrong because controlling population growth should not mean increasing deaths; education supports healthier decisions. Option C is wrong because education does not reduce the physical area of land. Option D is wrong because migration is only one factor affecting population change, and education does not control population growth only by stopping it. Education alone does not produce an identical result everywhere; access to healthcare, rights, income, and social conditions also matter. Memory cue: education supports informed health and family-size decisions.

Correct answer: A. Death rate may decline

Direct answer: A, the death rate may decline. Health services include doctors, hospitals, medicines, vaccination, sanitation support and emergency care. When these services improve, illnesses can be prevented or treated more successfully, so fewer people may die, especially from preventable causes. If births remain higher than deaths, the population can grow more quickly; however, better health services do not automatically determine the birth rate. Option A is correct because it describes a realistic effect of improved healthcare. Option B is wrong because better healthcare does not make births zero. Option C is wrong because healthcare cannot double the physical area of a place. Option D is wrong because migration is movement of people and is not made impossible by medical improvement. Memory cue: better health usually means lower mortality, not zero birth.

Correct answer: A. To plan services and facilities

Direct answer: A, to plan services and facilities. Administration needs information about the number of people, their age groups, location and rate of growth. This information helps authorities estimate how many schools, teachers, hospitals, health workers, houses, roads, water connections and sanitation facilities may be needed. The study of population does not give an exact guarantee about every future need, but it supports informed planning and fair distribution of resources. Option A is correct because public services are planned according to the size and changing needs of the population. Option B is wrong because population data cannot reduce mountain height. Option C is wrong because it has no connection with changing a river’s colour. Option D is wrong because administration studies population to serve people, not to remove soil. Memory cue: population information helps plan people-centred services.

Correct answer: A. Increase in demand for education and health services

Direct answer: A, an increase in demand for education and health services. Population growth means that the number of people in a place rises. More people may require more schools, teachers, hospitals, doctors, vaccination services and other facilities. The reasoning is: more people → more users of social services → greater social demand. Option A is correct because education and healthcare are services used by society and their demand can rise as population increases. Option B is wrong because river flow is mainly related to rainfall, climate, drainage and human water projects, not a necessary social effect. Option C is wrong because mountains do not disappear simply because population grows. Option D is wrong because sky colour is linked to atmospheric conditions, not directly to population size. The effect is a possible and important planning pressure, not an unavoidable result in every place. Memory cue: more people usually mean greater demand for people-centred services.

Correct answer: A. Increase in demand for employment

Direct answer: A, an increase in demand for employment. When the population grows, more people may need work, income and livelihoods. Therefore, the demand for jobs can increase, making employment an important economic concern. Option A is correct because employment is connected with labour, income, production and the economy. The exact outcome depends on education, skills, investment and the number of jobs available, so population growth does not guarantee that everyone will find work. Option B is wrong because changing a soil name is not an economic effect. Option C is wrong because a river reversing direction is a physical or geographical event, not a normal direct economic consequence. Option D is wrong because population growth does not automatically reduce a mountain’s weight. Memory cue: economic effects involve jobs, income, production and resources; among the choices, only employment fits.

Correct answer: A. Increase in pressure on land and water

Direct answer: A, increased pressure on land and water. A larger population generally needs more space for housing, farming, roads and other activities, as well as more water for drinking, sanitation, agriculture and industry. This can place greater pressure on these environmental resources, especially when use is not carefully managed. Option A is correct because land and water are natural resources affected by human demand. Option B is wrong because a clock’s shape is unrelated to population growth. Option C is wrong because the number of lines in a book does not describe an environmental effect. Option D is wrong because changing a mountain’s name is a cultural or administrative action, not a direct environmental effect. Population growth does not produce exactly the same result everywhere, but resource pressure is a valid possible effect. Memory cue: more people generally mean greater demand for land and water.

Correct answer: A. Population growth

Direct answer: A, population growth. Population growth means that the number of people living in a place has increased over a period of time. Here, the earlier population is 10 lakh and the later population is 11 lakh. Subtracting gives 11 lakh − 10 lakh = 1 lakh, so the population has increased by one lakh. The important clue is the rise in the total number of people. Option A is correct because it names this increase. Option B is wrong because population density means people per unit area and requires an area figure. Option C is wrong because sex ratio compares females and males. Option D is wrong because literacy rate refers to the proportion of literate people. Memory cue: a higher population number over time means growth; density needs area, while ratios need comparison of groups.

Correct answer: B. Population decline

Direct answer: B, population decline. Population decline means that the number of people becomes smaller over time. The population changes from 12 lakh to 10 lakh, so 12 lakh − 10 lakh = 2 lakh people fewer. The downward change, not merely the presence of a population figure, is the key clue. Option B is correct because it names a decrease in population. Option A is wrong because growth means the later number is greater, not smaller. Option C is wrong because density requires both population and area; these figures alone do not provide area. Option D is wrong because age structure describes the distribution of people among age groups and cannot be known from two total population figures. The exact cause is not given; it could involve deaths, fewer births, outward migration, or a combination. Memory cue: later number lower means decline.

Correct answer: A. Birth rate can affect growth

Direct answer: A, birth rate can affect population growth. Birth rate is the number of live births in a population during a specified period, usually expressed in relation to the population. When more births occur, new members are added to the population. If the death rate and migration do not offset those additions, a high birth rate can make population growth faster. Option A is correct because it describes this relationship without claiming that birth rate is the only factor. Option B is wrong because soil is a physical resource, not a demographic rate. Option C is wrong because area measures the extent of land and is used with population to calculate density. Option D is wrong because a mountain is a landform. Birth rate is important, but births, deaths, and migration should be considered together. Memory cue: births add; deaths subtract; migration can add or subtract.

Correct answer: A. Death rate affects growth

Direct answer: A, death rate affects population growth. Death rate indicates the number of deaths in a population during a specified period. Deaths remove people from the population, so a higher death rate generally reduces natural increase, especially when other factors remain similar. A lower death rate can allow the population to grow more quickly if births exceed deaths. Option A is correct because death rate is a real component of population change. Option B is wrong because a river is a physical feature, not a rate of deaths. Option C is wrong because death rate does not increase land area; area is a separate geographical measurement. Option D is wrong because death rate has a clear demographic meaning. The final population also depends on births and migration, so death rate alone cannot explain every change. Memory cue: natural change is linked to births minus deaths; migration must then be considered separately.

Correct answer: A. Seeing births, deaths, migration and time period together

Direct answer: A. Population growth is understood by examining how the number of people changes during a stated period. Births add people, deaths remove people, inward migration adds people, and outward migration removes people. The time period is necessary because growth describes change between one time and another. Option A is correct because it includes all these basic elements. Option B is wrong because a river name does not measure population change. Option C is wrong because mountain height is a physical-landform feature, not a population measure. Option D is wrong because soil colour does not show the number of residents. A useful simple expression is: change in population = births − deaths + inward migration − outward migration, although a question may not provide every figure. Memory cue: B-D-M-T—births, deaths, migration, and time—help explain population change.

Correct answer: A. Change in the number of people over time

Direct answer: A, change in the number of people over time. Population growth is a demographic concept that describes how the size of a population changes between two times. The change may be an increase or, in a broader discussion of population change, a decrease; the question is asking for the central idea of change in population size. Option A is correct because it refers to people and to time, the two essential clues. Option B is wrong because area concerns the amount of land and is not the population count. Option C is wrong because weather describes atmospheric conditions. Option D is wrong because soil colour is a physical characteristic of soil. Do not confuse population growth with population density: density compares population with area. Memory cue: population growth asks “how has the number of people changed over time?”

Correct answer: B. Population at two different points in time

Direct answer: B, population at two different points in time. Growth is a change, so one population figure by itself cannot show whether the number has risen, fallen, or stayed the same. We need a starting figure and a later figure, such as populations recorded in two different census years. Comparing the later number with the earlier number reveals the direction and amount of change. Option B is correct. Option A is wrong because a single figure gives size at one time but no comparison. Option C is wrong because area alone cannot show population change; area is useful when calculating density with population. Option D is wrong because climate may influence settlement but is not the measurement of growth itself. Memory cue: to measure change, compare “before” with “after.” If the later population is higher, it increased; if lower, it declined.