Population Growth

Correct answer: A. Number of births per thousand population in a year

Direct answer: A, the number of births per thousand population in a year. Birth rate is a demographic measure used to compare births in places or periods with different population sizes. First identify the births occurring during one year. Then relate that number to the population and express the comparison per 1,000 people. Option A is correct because it includes the time period, births, population base and per-thousand unit. Option B is wrong because mountains are physical features and are not used to measure births. Option C is wrong because rivers are geographical features, not a population rate. Option D is wrong because migrants are people who move into or out of an area; they are not the babies counted in the birth rate. A simple form is: birth rate = births in one year ÷ population × 1,000. Memory cue: birth rate means births per thousand people per year.

Correct answer: A. Number of deaths per thousand population in a year

Direct answer: A, the number of deaths per thousand population in a year. Death rate is a demographic measure that relates deaths during one year to the population being studied. The per-thousand basis makes comparison easier between places with different population sizes. To understand it step by step, count deaths in the year, compare them with the population, and express the result for every 1,000 people. Option A is correct because it contains all these parts. Option B is wrong because trees are part of the natural environment, not a measure of human mortality. Option C is wrong because roads measure infrastructure, not deaths. Option D is wrong because schools are institutions and their number does not define death rate. A simple form is: death rate = deaths in one year ÷ population × 1,000. Memory cue: death rate is deaths per thousand people per year.

Correct answer: A. In percentage

Direct answer: A, in percentage. A growth rate describes the amount of change compared with a starting population, so it is commonly expressed as a relative value. To calculate a simple percentage increase, find the change, divide it by the original population, and multiply by 100. For example, if a population rises from 1,000 to 1,100, the increase is 100; 100 divided by 1,000 and multiplied by 100 equals 10%. Option A is correct because percentage shows relative change. Option B is wrong because kilograms measure mass. Option C is wrong because metres measure length or distance. Option D is wrong because litres measure volume. None of those units expresses population growth rate. Memory cue: a rate of increase is commonly written with the percent sign, although some demographic rates may also use other stated conventions.

Correct answer: A. Ten years

Direct answer: A, ten years. The word “decadal” comes from “decade,” and a decade means a period of ten years. Decadal population growth therefore compares the population at one point with the population ten years later, or measures the change during a ten-year period. For example, a census may compare the population recorded in one census year with that recorded in the next census after ten years. B is wrong because five years is a half-decade. C is wrong because twenty years covers two decades. D is wrong because fifty years covers five decades. Memory cue: decade = ten, so decadal growth = ten-year growth.

Correct answer: A. Census data

Direct answer: A, census data. A census is an organised counting and description of the population carried out at a particular time. When population figures from two different census years are compared, we can find whether the population has increased, decreased, or remained nearly unchanged. The comparison can also show changes in population size and growth rate. B is wrong because a song does not provide measured population figures. C is wrong because a drawing book is not a demographic record. D is wrong because a tourism poster may advertise places but does not provide systematic population data. Memory cue: census counts people; comparing census counts helps measure population growth.

Correct answer: A. Increased demand for resources and services

Direct answer: A. When the number of people increases, more people may need food, water, housing, land, energy, transport, schools, hospitals, and other services. Therefore, population growth can increase demand and place greater pressure on available resources and public facilities. The result depends on consumption patterns, technology, planning, and the availability of resources; it is not identical everywhere. B is wrong because population growth does not mean every river must disappear. C is wrong because mountains do not automatically become smaller. D is wrong because a compulsory change in soil colour is not a general result of population growth. Memory cue: more people generally mean greater demand for resources and services.

Correct answer: A. Population decline

The direct answer is A: population decline. Population means the number of people living in a particular place, while decline means a decrease. To solve this, compare the population at an earlier time with the population at a later time. If the later number is smaller, the population has declined. Option A is correct because “population decline” directly describes a fall in the number of people. Option B is wrong because a population explosion means very rapid population growth, which is the opposite of a decrease. Option C is wrong because population density means the number of people living per unit of area; it does not itself mean that the total population is falling. Option D is wrong because population distribution describes how people are spread across different places. Memory cue: decline means down, whereas explosion means rapid increase.

Correct answer: A. Very rapid increase of population

The direct answer is A: a very rapid increase in population. Population explosion is used when the number of people grows very quickly, often putting strong pressure on food, housing, employment, education and other resources. Begin by noticing the word “explosion”: in this context it is a warning of sudden or unusually fast growth, not a literal explosion. Option A is correct because it gives the exact general meaning. Option B is wrong because a population becoming zero would mean complete disappearance, not rapid growth. Option C is wrong because soil erosion is the removal of the upper layer of soil by water, wind or other forces. Option D is wrong because conservation of vegetation means protecting plants and forests. Memory cue: explosion means population goes up very fast.

Correct answer: A. Because more people survive

The direct answer is A: more people survive. Population change depends on births, deaths and migration. If the death rate falls while other conditions remain comparable, fewer people die during a given period. Therefore, more of the population remains alive, and the population can grow faster or decline more slowly. Option A is correct because it identifies the direct effect of a lower death rate. Option B is wrong because the physical area of a country does not disappear when the death rate changes. Option C is wrong because a falling death rate does not mean that births stop; births and deaths are separate population processes. Option D is wrong because stopping a census would only reduce the availability of population data; it would not directly change the number of people. Memory cue: fewer deaths leave more survivors.

Correct answer: A. Population

The direct answer is A: Population. Population growth studies how the number of people changes over time. It can include the effects of births, deaths and migration, as well as related ideas such as growth rate and population structure. To solve the question, identify the key words “population growth” and match them with the chapter that studies people and their numbers. Option A is correct because Population is the relevant chapter. Option B is wrong because Climate studies long-term patterns of temperature, rainfall and other atmospheric conditions. Option C is wrong because Wildlife focuses on wild animals and their habitats. Option D is wrong because Drainage studies rivers, streams and the flow of water. These subjects can influence human life, but they are not the chapter directly named by the question. Memory cue: the main subject named in the phrase usually gives the chapter.

Correct answer: A. Birth rate

The direct answer is A: birth rate. Birth rate measures the number of live births in a population during a specified period, commonly expressed per 1,000 people. Therefore, when more children are born, the birth rate tends to rise, provided the population and time period are being compared appropriately. Option A is correct because it directly counts births. Option B is wrong because death rate counts deaths, not births. Option C is wrong because infant mortality rate measures deaths of infants, usually children below one year of age, rather than the number of children born. Option D is wrong because literacy rate concerns the share of people who can read and write, not births. Memory cue: birth leads to birth rate; death leads to death rate.

Correct answer: A. Births and deaths are nearly equal

The direct answer is A: births and deaths are nearly equal. Natural population change depends on the difference between births and deaths. If approximately as many people are born as die, this difference is close to zero, so the population is more likely to remain stable, assuming migration is also small or balanced. Option A is correct because it describes a balance between additions and losses. Option B is wrong because very high births and very low deaths create rapid growth. Option C is wrong because everyone moving in would add people and make the population rise, not remain stable. Option D is wrong because births without deaths would cause continuing increase. Stability does not mean that no one is born or dies; it means the overall numbers are roughly balanced. Memory cue: stable means additions and losses balance.

Correct answer: A. The proportion by which the population has changed

Direct answer: A, the proportion by which the population has changed. A percentage compares the amount of change with the earlier population and expresses that comparison out of one hundred. For example, if a population changes from 1,000 to 1,100, the increase is 100, which is 10% of the original 1,000. Thus, percentage growth tells us the relative size of the change, not merely the new total. Option A is correct. Option B is wrong because river water is a physical or hydrological matter, not a population percentage. Option C is wrong because mountain height is measured as distance or elevation. Option D is wrong because soil colour is a physical characteristic. Memory cue: percentage means “part out of 100”; population growth percentage means population change compared with the starting population.

Correct answer: A. Education and health services

Direct answer: A, education and health services. When the number of people increases, more children may need schools and more people may need doctors, hospitals, vaccination, and other health facilities. Planners therefore study population growth before deciding how many classrooms, teachers, clinics, and hospitals may be required. Option A is correct because education and health are basic services used by people and their demand can rise with population. Option B is wrong because mountaineering is a specialised activity, not a basic service required by every growing population. Option C is wrong because songs do not represent a necessary public service in this context. Option D is wrong because river worship is a cultural practice and does not measure general service demand. Remember: more people usually mean greater need for schools, hospitals, water, housing, and transport.

Correct answer: A. Development and resource planning

Direct answer: A, development and resource planning. Population information helps planners estimate how many people may need food, water, houses, schools, hospitals, transport, employment, and other facilities. A sensible process is to find the present population, examine its rate of increase or decrease, estimate likely future needs, and then plan resources accordingly. Option A is correct because development should match the number and needs of people. Option B is wrong: population data may be shown in a graph or map, but drawing is only a method of presentation, not its main purpose. Option C is wrong because singing has no direct role in allocating resources. Option D is wrong because colour selection is not the purpose of demographic information. Memory cue: population data helps answer “how many people, what needs, and where?”

Correct answer: A. The death rate may decrease

Direct answer: A, the death rate may decrease. Better health facilities can provide earlier treatment, safer childbirth care, prevention, medicines, and care for illness. These improvements can reduce the number of deaths in relation to the population, so the death rate may fall. The word “may” is important because many factors influence death rates, but improved health care generally supports lower mortality. Option A is correct. Option B is wrong because better facilities do not always increase deaths. Option C is wrong because death rates can still be calculated and measured after facilities improve. Option D is wrong because the definition of death rate does not change; it still refers to deaths in relation to population during a specified period. Memory cue: improved care can save lives, so mortality may decline.

Correct answer: A. How much has the population changed over time?

Direct answer: A, “How much has the population changed over time?” Population growth means the increase, decrease, or overall change in the number of people during a stated period. Therefore, we compare population at two times or study its change across years. Option A is correct because it directly asks about change through time. Option B is wrong because people per square kilometre measures population density, which describes concentration in space rather than change through time. Option C is wrong because city area is a measure of land size. Option D is wrong because literacy rate describes the share of people who can read and write according to a stated measure; it is a population characteristic, not growth itself. Memory cue: growth asks “how has the number changed over time?” Density asks “how crowded is the place?”

Correct answer: A. Growth may increase

Direct answer: A, growth may increase. People who move into an area for employment are in-migrants. Their arrival adds to the population of that area, so population growth may rise, especially if the number arriving is greater than the number leaving or dying. Option A is correct because inward migration is an addition to local population. The word “may” is appropriate because the total growth also depends on births, deaths, and out-migration. Option B is wrong because incoming workers do not imply that growth will always decrease. Option C is wrong because migration does not make the birth rate end. Option D is wrong because the death rate is not made infinite by migration and is a separate demographic measure. Memory cue: in-migration means people come in and add to the place; out-migration means people go out and reduce it.

Correct answer: A. The population is increasing slowly or becoming stable

Direct answer: A, the population is increasing slowly or becoming stable. A growth rate measures how quickly population size changes relative to a given period or base. A low positive rate means the population is still increasing, but slowly. If additions and losses are nearly balanced, the population may be close to stable; the rate could also be zero or negative in some situations. Option A is correct because it expresses the reasonable meaning of a low rate without claiming that there are no people. Option B is the opposite of a low rate, so it is wrong. Option C is wrong because a low growth rate does not mean population is absent. Option D is wrong because an infinite birth rate is impossible in this context and is not implied by low growth. Memory cue: low rate means slow change, not zero population.

Correct answer: A. It shows population change through births, deaths and migration

Correct answer: A. Population growth means the change in the number of people during a particular period. To understand this change, we consider three main components: births add people, deaths remove people, and migration changes the population when people enter or leave an area. Thus, population growth is not limited to births alone. B is wrong because rainfall is a climatic element, not a direct component of population growth. C is wrong because soil texture describes soil, not changes in human numbers. D is wrong because forest height belongs to vegetation study. A useful memory cue is: population change = births − deaths + net migration. Always distinguish population growth from population density, which means people per unit area.

Correct answer: A. Growth may slow down

Correct answer: A. Birth rate is the number of live births in a population during a specified time, usually expressed relative to the population. When fewer babies are born and other factors remain broadly unchanged, fewer people are added each year. As a result, the rate of population increase may slow down. The word “generally” matters because migration and deaths can also influence the final change. B is wrong because a lower birth rate does not normally make growth rapid. C is wrong because birth rate and death rate measure different events; fewer births do not eliminate deaths. D is wrong because migration is the movement of people and is not made impossible by a fall in births. A helpful cue is: fewer additions usually mean slower increase, not automatic population decline.

Correct answer: A. Birth rate, death rate and migration

Correct answer: A. Population growth is studied by examining how the number of people changes over time. The principal demographic components are birth rate, death rate, and migration. Births add to population, deaths reduce it, and migration can add or remove people from a particular area. B contains physical and climatic features, which may influence settlement but are not the basic group used to calculate population change. C lists physical features and wildlife, not demographic measures. D lists objects or activities that do not form the standard components of population growth. A useful memory cue is B-D-M: births, deaths, and movement (migration). Do not confuse factors that may influence where people live with the processes that directly change population size.

Correct answer: A. Because it shows population change over ten years

Correct answer: A. A decade is a period of ten years. Decadal change compares the population at two points separated by about ten years and shows how much the population has increased, decreased or changed during that period. This helps students and planners identify a longer-term population trend instead of judging growth from a single year. Population data collected through regular censuses or other surveys can be compared across decades, while the exact reference period depends on the data source. B, C and D are wrong because decadal population change is a demographic measure; it does not describe river direction, mountain colour or the taste of soil. Memory cue: decade means ten years, so decadal change means change over ten years.

Correct answer: B. 12 lakh

Correct answer: B. Absolute increase means the actual number added to the original population. To find it, subtract the initial population from the final population: 92 lakh − 80 lakh = 12 lakh. Therefore, the population increased by 12 lakh, not by 92 lakh. Option A is incorrect because the subtraction does not give 10 lakh. Option C is incorrect because adding 80 lakh and 92 lakh is not the method for finding increase, and their sum would be 172 lakh rather than the change. Option D is the final population, not the number added. Keep the unit unchanged: both figures are given in lakh, so the answer is also in lakh. Memory cue: absolute increase = final population − initial population.

Correct answer: C. It is change in population number over time

Direct answer: Option C. Population growth means the change in the number of people in a population over a particular period. The change may be positive, negative or zero. Births and in-migration add people, while deaths and out-migration remove people. Thus, growth is a broad result of several demographic processes, not just one rate. Option A is wrong because birth rate measures births in relation to a population, but it does not by itself describe the whole change in population. Option B is wrong because death rate measures deaths, not total population growth. Option C is correct because it gives the basic meaning: population number changes over time. Option D is wrong because area is a physical measure of land and is used, for example, in density calculations, not as the definition of growth. Memory cue: growth asks, “How has the number of people changed with time?”