Population Growth

Correct answer: B. To study population growth, we compare population data at two points in time. The base year is the starting reference, and the final year is the later point used for comparison. These years tell us the time period over which the change occurred and help us identify its direction—whether population increased, decreased, or remained unchanged. They also prevent a numerical figure from being interpreted without context. A is wrong because selecting years does not remove or change the birth rate. C is wrong because years have no power to change the area of a region. D is wrong because migration can continue regardless of the selected years. Memory cue: no time points, no meaningful growth comparison; always ask “from when to when?”

Correct answer: D. Absolute increase means the actual numerical change in population between the beginning and the end of a period. To find it, identify the final population and subtract the initial population: absolute increase = final population − initial population. A is wrong because adding the two populations does not show the change between them. B is wrong because area is not added to population; the units are different. C gives population density, not absolute increase, because density is population divided by area. D is correct because subtraction isolates the number of people added when the population rises. If the final population is smaller, the same calculation gives a negative change, showing decline. Memory cue: final minus initial gives the actual increase.

Correct answer: A. Absolute increase is found by subtracting the initial population from the final population. The initial population is 30 lakh and the final population is 36 lakh. Therefore: 36 lakh − 30 lakh = 6 lakh. The population has added six lakh people during the period. B is the initial population, not the increase. C is the final population, not the amount added. D results from adding 30 lakh and 36 lakh, but addition is not the method for finding absolute increase. The unit “lakh” remains the same throughout the calculation, so there is no need to convert it. Memory cue: for an increase, always calculate “later value minus earlier value.”

Direct answer: Option B is correct. Absolute increase tells us how many people were actually added or lost. It is found by subtracting the earlier population from the later population, so it is expressed as a number. For example, if a population rises from 10,000 to 12,000, the absolute increase is 2,000 people. Growth rate compares this change with the earlier population and usually expresses it as a percentage or rate. Thus, the same increase can represent different growth rates in populations of different sizes. Option A is wrong because neither term is simply a list of births or the death rate. Option C confuses population measures with physical area and rainfall. Option D is wrong because the two measures answer different questions: “how many?” versus “how fast or what proportion?” Memory cue: absolute increase is the number added; growth rate is the relative change.

Direct answer: Option B is correct. To understand natural population growth, we must compare the birth rate with the death rate rather than examine only one of them. In a simplified form, natural growth rate is related to birth rate minus death rate. If both rates decline by the same amount, their difference may remain unchanged. If the death rate falls more than the birth rate, the difference can become larger and growth may rise. If the birth rate falls more sharply, the difference can become smaller and growth may slow. Migration may also affect total population change, so it should be considered when the question asks about total growth. Option A is unrelated to the rate difference. C and D do not measure demographic growth. Memory cue: compare the two rates, not just their direction of change.

Direct answer: Option C is correct. Natural increase is based on the difference between births and deaths. When births are much greater than deaths, many more people are added through natural change than are removed, so the natural increase is large and can be described as rapid. Option A gives no natural increase because both values are zero. Option B produces a negative natural increase because deaths exceed births, so it indicates decline rather than rapid growth. Option D produces zero natural increase because the two numbers balance each other. This idea concerns natural change only; migration can separately raise or lower the total population. Also, “rapid” refers to a relatively large increase in relation to the population and time period, not merely to a large number of births considered alone. Memory cue: a wide positive gap between births and deaths means rapid natural increase.

Direct answer: Option D is correct. Natural increase is calculated from births minus deaths. If deaths are greater than births, the subtraction gives a negative result, so natural increase is negative. This means that, before considering migration, the population is losing more people through deaths than it is gaining through births. Option A gives a positive natural increase because births exceed deaths. Option B gives zero natural increase because the two numbers are equal. Option C concerns migration, not natural increase; positive migration may increase the total population even when natural increase is negative. It is important to distinguish natural increase from total population change, because births, deaths and migration can work in different directions. Memory cue: for natural increase, write births first and subtract deaths; if the answer is below zero, deaths were greater.

Direct answer: Option A is correct. Population growth means that more people need to use schools, hospitals, homes, water, transport and other public services. Step by step, the number of residents rises; their basic and social needs also rise; therefore demand for education, health care and housing may increase. If facilities do not expand at a similar pace, overcrowding, competition for services or shortages may occur. Option B is not the direct social result asked for; river depth can be affected by physical processes and human activities, but it is not an automatic consequence of population growth. Option C is wrong because population growth does not automatically reduce the number of mountains. Option D is wrong because soil colour does not change automatically merely because population increases. Population growth can create social pressure and may also influence the environment through human activity, but those effects should not be confused with automatic physical changes. Memory cue: more people usually mean greater demand for services.

Correct answer: A. Population growth means that the number of people living in an area increases. More people may need work, so the number of job seekers and the demand for employment can rise. If the economy does not create enough jobs, unemployment or underemployment may increase; if jobs and skills grow together, the larger population can also become a productive workforce. Option A is correct because it states a possible economic result, not an unavoidable result. B is wrong because population growth does not necessarily dry rivers; river flow depends on rainfall, climate, extraction and other factors. C is wrong because the physical area of a region does not automatically increase when its population grows. D is wrong because income depends on wages, productivity, prices and employment, so it cannot immediately double for every family. Memory cue: more people usually mean greater demand for both work and resources.

Correct answer: A. When population grows, more people need water, land, food, housing and energy. Their activities also produce more domestic and solid waste. Therefore, existing water supplies, land resources and waste-management systems may face greater pressure, especially when planning and public services do not expand adequately. Option A is carefully worded with “may,” because the result depends on consumption patterns, technology, planning and resource management. B is incorrect because population growth does not normally change the colour of the sky; sky colour is mainly related to sunlight and atmospheric conditions. C is incorrect because mountains do not simply disappear when population rises. D is incorrect because the number of days is determined by the calendar and the Earth’s movements, not by population size. Memory cue: population growth increases the number of resource users and waste producers.

Correct answer: A. Education gives people information and helps them make informed decisions. Health education can explain nutrition, reproductive health, the spacing of children and available family-planning choices. Education may also improve awareness of the social and economic needs of raising a family, encouraging some people to choose a smaller family. The word “can” is important: education supports awareness and informed choice, but it does not produce exactly the same decision in every family. B is wrong because education does not necessarily increase births; its effect is not a fixed increase. C is wrong because education may influence understanding of migration but cannot completely stop people from moving. D is wrong because education cannot change the physical area of land. Memory cue: education informs choices; it does not force one result.

Correct answer: A. Growth rate is a percentage, while absolute increase is the actual number added. The basic calculation is: absolute increase = base population × growth rate. For example, 2% of 1 crore is 2 lakh, whereas 2% of 1 lakh is only 2,000. Thus, a low percentage can still produce a large numerical increase when the starting population is very large. B is not necessarily correct because having no births does not by itself tell us the total change; deaths and migration also matter. C is wrong because a zero population cannot produce a large increase under the stated idea. D is irrelevant because area disappearing does not define population growth. Memory cue: percentage is the rate; the starting number determines how large the actual addition becomes.

Correct answer: B. When the growth rate is the same, the absolute increase is found by applying the same percentage to each base population. A larger base therefore produces a larger numerical addition. For example, at 10% growth, a population of 1,000 increases by 100, while a population of 10,000 increases by 1,000. Option A reverses this relationship. C is wrong because a positive growth rate normally adds people, so the increase is not zero. D is wrong because the rate is essential to calculating the increase, even though the base population also matters. The comparison assumes the same time period and the same stated growth rate. Memory cue: same percentage plus bigger starting number equals bigger actual increase.

Correct answer: A. Population density means the average number of people living per unit of area, often expressed as persons per square kilometre. Population growth means that the number of people changes over time. If the population increases while the area remains unchanged, the number of people per unit area rises, so density increases. The word “can” makes A cautious because density also depends on the area being considered. B is wrong because growth is a change over time, whereas density is a population-area ratio. C is wrong because growth concerns population number, not only area. D is wrong because birth rate is one factor that can affect population change; it is not the definition of density. Memory cue: density asks “how many per area,” while growth asks “how the number changes over time.”

Correct answer: A. Cities often attract people because they provide more varied employment, educational institutions, hospitals and other services. These are human or socio-economic pull factors. People may move from villages or smaller settlements to towns and cities, or an existing urban area may grow as its opportunities expand. Option A is correct because it identifies services and opportunities that influence human settlement and migration. B, C and D are generally physical conditions that can make settlement more difficult, not human reasons that attract urban population. A steep slope can limit construction and transport; an extremely arid climate and lasting water scarcity can also discourage settlement. They should not be treated as universal rules, but they do not fit the intended urban pull factor. Memory cue: jobs and services pull people towards cities.

Direct answer: Option B, 600. To find total population growth, first calculate natural change by subtracting deaths from births: 1000 − 600 = 400. This means the area gains 400 people through natural change. Net migration is then added because a positive net migration means that 200 more people entered than left. Therefore, total growth = births − deaths + net migration = 1000 − 600 + 200 = 600. Option A, 400, includes only natural change and ignores migration. Option B, 600, includes both natural change and net migration, so it is correct. Option C, 800, results from an incorrect calculation and does not follow the formula. Option D, 1800, adds births, deaths and migration without treating deaths as a decrease. Memory cue: births and in-migration add people; deaths and out-migration remove people.

Direct answer: Option B, negative 200. Natural change considers only births and deaths; migration is not included in this calculation. Use the formula natural change = births − deaths. Here, 500 − 700 = −200. The negative sign is important because deaths are greater than births by 200. Net migration is zero, so it cannot change this result. Option A, positive 200, reverses the subtraction and incorrectly treats the larger number of deaths as an increase. Option B, negative 200, correctly shows that the population decreases naturally by 200. Option C, positive 1200, adds births and deaths, although deaths must be subtracted. Option D, zero, would be correct only if births and deaths were equal, not when they differ by 200. Memory cue: natural change means births minus deaths; a negative result means deaths exceed births.

Direct answer: Option A. Population remains stable when the number of people added equals the number of people removed. People are added through births and in-migration. People are removed through deaths and out-migration. Therefore, the condition for no overall change is births + in-migration = deaths + out-migration. Option A states exactly this balance, so the total population can remain unchanged. Option B would usually cause population growth because births exceed deaths, unless some large out-migration exactly balances it; that balance is not stated. Option C adds many people and therefore tends to increase population. Option D removes people and therefore tends to decrease population. The word “stable” refers to total balance, not to zero births or zero movement. Memory cue: stable population means additions equal removals.

Direct answer: Option A. A high birth rate means that many births occur in a given population and period. If the death rate remains low, births are greater than deaths, so natural increase can be rapid. The final population change may also be affected by migration, but the stated condition is enough to show a possible increase. Option A correctly uses “can,” because it describes a possible result rather than claiming that it happens in every situation. Option B is wrong because high births do not make growth zero; they generally add to population unless offset by deaths or out-migration. Option C is wrong because birth rate does not directly change the physical area of a region. Option D is wrong because birth rate does not automatically determine migration, and the word “always” is too absolute. Memory cue: high births plus low deaths usually means a high natural increase.

Direct answer: Option A. Age structure describes how a population is divided into age groups, such as children, working-age people and older people. When a population has rapid growth because many births are occurring, younger age groups may form a larger share of the population. This is a possible relationship, not an absolute rule for every population. Option A is therefore correct. Option B is wrong because rapid growth associated with many births does not make everyone elderly; it can increase the proportion of children and young people. Option C is wrong because age structure is an important characteristic of a population and is connected with birth patterns and demographic change. Option D is wrong because rapid growth does not stop births; high births may be one reason for rapid growth. Memory cue: many recent births create a wider base of the age structure, meaning more children and youth.

Direct answer: Option A. When population increases, more people need essential services. A larger number of children may require additional schools and teachers; more residents may require hospitals, health workers, housing, water supply and sanitation. Planning helps authorities estimate future demand and provide services fairly and in time. Option A correctly names schools, hospitals and housing as examples of services or facilities that may need expansion. Option B is wrong because transport is important, but planning is not limited to transport. Option C is wrong because a larger population normally creates greater demand rather than automatically reducing it. Option D is wrong because population size directly affects the number of people needing education, healthcare and housing. The exact amount of planning depends on population size, age structure, location and available resources. Memory cue: more people mean more needs, so planning must look ahead.

Correct answer: A. Crowding occurs when many people need to use limited space and services. If a city's population grows quickly but new houses are built slowly, the number of available homes does not keep pace with demand. Existing homes may become overcrowded, rents may rise, and some people may live in inadequate conditions. Option A describes both parts of the problem: rapid population growth and slow housing supply. B would generally reduce pressure because fewer people and more houses are present. C would tend to reduce population growth because people are leaving and births are low. D describes an empty city, so there would be no crowding. Memory cue: pressure rises when demand grows faster than supply.

Correct answer: A. Population growth can increase demand for water, food, housing, energy, schools and health services, but its final effect is not identical everywhere. We must also ask how much of a resource is available, how fairly it is distributed, and how efficiently it is managed. Good planning, conservation and improved technology can reduce pressure, while poor management can create shortages even where population growth is modest. B is wrong because the word “always” makes an extreme claim; growth does not automatically use up every resource. C is wrong because resource problems can exist even with low growth. D is wrong because population needs clearly affect resource demand. Memory cue: population plus availability plus management gives a balanced explanation.

Correct answer: A. A percentage describes change relative to the starting population, so it must be read together with the actual number of people. For example, 2% of 10 lakh is 20,000, while 2% of 1 crore is 2 lakh. The percentage is the same, but the second increase adds many more people and may require much more housing, water, transport, schools and health services. B and D do not provide a real population base for this comparison. C would mean no natural increase from births minus deaths in that simple situation, but it does not explain the stated planning challenge. Memory cue: always ask, “Two percent of how many?”

Correct answer: A. Percentage expresses a change in relation to the original population. This is useful because two places may add different numbers of people and begin with very different population sizes. For example, an increase of 10,000 is a much larger relative change for a population of 50,000 than for a population of 10 lakh. Calculating percentage growth places the changes on a comparable scale. B is wrong because percentage growth does not remove or ignore area; area is relevant to density, not eliminated by this calculation. C and D describe unrelated biological or migration changes. A percentage is a comparison tool, not a way to change the population process itself.