NCERT Solutions for Class 12 Sociology Chapter 2: The Demographic Structure of the Indian Society
These Class 12 Sociology Chapter 2 solutions cover The Demographic Structure of the Indian Society from the NCERT textbook Indian Society (Book I), updated for the 2026–27 session. The chapter introduces demography as the systematic study of population and explains key theories — the Malthusian theory of population growth and the theory of demographic transition — along with core indicators such as birth rate, death rate, fertility rate, the sex ratio, age structure and the dependency ratio. It then applies these ideas to India: the size and growth of the population, its young age structure and the demographic dividend, the alarming decline in the child sex ratio, literacy, rural–urban differences and India’s population policy. Below you get verbatim NCERT questions with original, exam-ready answers, key concepts, extra practice, 10 MCQs, Assertion–Reason items and FAQs.
Class: 12Subject: SociologyBook: Indian Society (Book I)Chapter: 2Chapter Name: The Demographic Structure of the Indian SocietySession: 2026–27
Chapter 2, The Demographic Structure of the Indian Society, shows why demography — the systematic study of population — is so important to sociology. It distinguishes formal demography (the quantitative measurement of population change) from social demography (which studies the social causes and consequences of population trends). The chapter explains two major theories: the pessimistic Malthusian theory, which held that population grows in geometric progression while food grows only in arithmetic progression, and the theory of demographic transition, which links population growth to stages of economic development and explains the ‘population explosion’ of the transitional stage. It defines indicators like birth rate, death rate, growth rate, fertility rate, infant and maternal mortality, life expectancy, sex ratio, age structure and the dependency ratio. Applying these to India, it covers the size and growth of India’s 121-crore population, its young age structure and the demographic dividend, the worrying decline in the child sex ratio, rising literacy, rural–urban differences, and India’s population policy from the National Family Planning Programme (1952) to the National Health Policy 2017.
Key Concepts & Terms
Demography: the systematic study of population. The word is of Greek origin, from demos (people) and graphein (describe). It studies population size, the patterns of births, deaths and migration, and the structure and composition of population.
Formal demography vs social demography: formal demography is a largely quantitative field concerned with measuring and analysing the components of population change; social demography (or population studies) enquires into the wider social, economic and political causes and consequences of population structures and change.
Malthusian theory of population growth: Thomas Robert Malthus (1766–1834) argued that population rises in geometric progression (2, 4, 8, 16…) while food production grows only in arithmetic progression (2, 4, 6, 8…), so humanity is condemned to poverty unless population is controlled by ‘preventive checks’ (postponing marriage, abstinence) or by nature’s ‘positive checks’ (famines, diseases).
Theory of demographic transition: population growth is linked to the level of economic development through three stages — (1) low growth in an underdeveloped society (high birth and high death rates); (2) a transitional stage of very high growth (death rates fall fast but birth rates stay high — the ‘population explosion’); and (3) low growth in a developed society (both rates low).
Birth rate & death rate: the birth rate is the number of live births per 1,000 population in a year; the death rate is the number of deaths per 1,000 population in a year, for a given area.
Rate of natural increase (growth rate): the difference between the birth rate and the death rate. When it is near zero, the population is said to have ‘stabilised’ or reached the ‘replacement level’.
Fertility rate: the number of live births per 1,000 women in the child-bearing age group (usually 15–49 years). The total fertility rate (TFR) is the average number of children per woman; a TFR of about 2.1 is the replacement level.
Infant & maternal mortality rate: the infant mortality rate is the number of deaths of babies before the age of one per 1,000 live births; the maternal mortality rate is the number of women who die in childbirth per 1,00,000 live births. Life expectancy is the estimated number of years an average person is expected to live.
Sex ratio: the number of females per 1,000 males in a given area at a given time. The child sex ratio covers the 0–6 years age group; its sharp decline in India is linked to ‘son preference’ and the misuse of sonography for sex-selective abortion.
Age structure & dependency ratio: the age structure is the proportion of people in different age groups. The dependency ratio compares the dependent population (below 15 and above 64) with the working-age population (15–64), usually as a percentage; a falling ratio gives the demographic dividend.
Demographic dividend: the benefit that flows from a changing age structure when the working-age population is large relative to dependents — but it is temporary and must be realised through education and employment.
NCERT “Questions” — Full Solutions
All questions below are reproduced verbatim from the NCERT textbook’s end-of-chapter Questions section. Answers are original, written in exam-ready style.
1. Explain the basic argument of the theory of demographic transition. Why is the transition period associated with a ‘population explosion’?
ANSWERThe theory of demographic transition argues that population growth is closely linked to the overall level of economic development, and that every society passes through a typical pattern of development-related population growth in three stages.Stage 1 — low growth: In an underdeveloped, technologically backward society, both the birth rate and the death rate are very high, so the difference between them (the net growth rate) remains low.Stage 3 — low growth: In a developed society, both the death rate and the birth rate have been brought down considerably, so the difference between them is again small and growth is once more low.Stage 2 — the transitional stage: Between these two stages lies a transitional stage of movement from a backward to an advanced society, and this is the stage of very high population growth.Why a ‘population explosion’: The transition period is associated with a population explosion because death rates are brought down relatively quickly through advanced methods of disease control, public health measures and better nutrition, while the birth rate is slow to fall. It takes much longer for a society to adjust its reproductive behaviour — which evolved during a period of poverty and high death rates — to the new situation of relative prosperity and longer life spans. Because deaths fall fast but births stay high for a time, the gap between them widens sharply, producing very high rates of population growth.
2. Why did Malthus believe that catastrophic events like famines and epidemics that cause mass deaths were inevitable?
ANSWERThomas Robert Malthus believed that human populations tend to grow much faster than the means of human subsistence (especially food). According to him, population rises in geometric progression (2, 4, 8, 16, 32…) while agricultural production can grow only in arithmetic progression (2, 4, 6, 8, 10…).Because population growth always outstrips the growth of food and other subsistence resources, humanity, in his view, was condemned to live in poverty forever. The only way to increase prosperity was to control the growth of population.Malthus thought that humanity had only a limited ability to voluntarily reduce population through ‘preventive checks’ such as postponing marriage or practising abstinence and celibacy. Since these preventive checks were unlikely to be enough, he believed that ‘positive checks’ — famines and epidemic diseases that cause mass deaths — were inevitable, because they were nature’s way of dealing with the imbalance between food supply and an ever-increasing population.
3. What is meant by ‘birth rate’ and ‘death rate’? Explain why the birth rate is relatively slow to fall while the death rate declines much faster.
ANSWERBirth rate: the total number of live births in a particular area during a year divided by the total population of that area, expressed as the number of live births per 1,000 population.Death rate: a similar statistic — the number of deaths in a given area during a year per 1,000 population.Why the death rate falls faster: The death rate can be brought down relatively quickly because it responds to external measures that the state and medical science can provide — control of famines and epidemics, mass vaccination, improved sanitation, better nutrition and the spread of medical facilities. These directly reduce deaths without requiring people to change their habits.Why the birth rate is slow to fall: The birth rate, in contrast, is a socio-cultural phenomenon tied to deep-rooted attitudes, customs and values about marriage, family size and children. Such attitudes change slowly. The birth rate falls only gradually as infant mortality declines and as levels of education, awareness and prosperity rise, so that families voluntarily choose to have fewer children. Because changing reproductive behaviour takes a generation or more, the birth rate lags well behind the death rate.
4. Which states in India have reached or are very near the ‘replacement levels’ of population growth? Which ones still have very high rates of population growth? In your opinion, what could be some of the reasons for these regional differences?
ANSWERStates at or near the replacement level: States such as Kerala, Andhra Pradesh, Himachal Pradesh, Punjab, Tamil Nadu and West Bengal have brought their total fertility rates down to about 1.7 (in 2016), which is below the replacement level. Kerala’s TFR is also below the replacement level, meaning its population is set to decline in future.States with very high growth: States such as Bihar, Madhya Pradesh, Rajasthan and Uttar Pradesh still have very high TFRs — in 2016 their TFRs were about 3.3, 2.8, 2.7 and 3.1 respectively. Bihar and Uttar Pradesh together are expected to account for nearly half of the additions to India’s population up to 2041.Possible reasons for the regional differences (own opinion): The states with low fertility generally have higher female literacy and education, better healthcare and lower infant mortality, higher levels of development, urbanisation and prosperity, and greater awareness of and access to family-planning methods; women there also tend to marry later and have more say in family decisions. The high-fertility states, by contrast, have lower literacy (especially female literacy), poorer health and educational facilities, higher infant mortality, greater poverty, early marriage and a stronger preference for sons and larger families. In short, social development — particularly the education and empowerment of women — is the key factor behind these regional differences.
5. What is meant by the ‘age structure’ of the population? Why is it relevant for economic development and growth?
ANSWERAge structure: the age structure of the population refers to the proportion of persons in different age groups relative to the total population (for example, the share of the 0–14, 15–59 and 60+ age groups). It changes in response to changes in the level of development and in average life expectancy: as development raises life expectancy, the share of younger age groups falls and the share of older age groups rises — a process called the ageing of the population.Why it is relevant for economic development: The age structure decides the dependency ratio — the proportion of dependents (children below 15 and the elderly above 64) to people of working age (15–64). A society with a large working-age population relative to dependents can produce more and save more, while a high dependency ratio places a heavy burden on workers.The demographic dividend: India has a very young population, which gives it a potential ‘demographic dividend’ — a large labour force supporting only a small dependent population, which can boost growth and prosperity. However, this advantage is temporary and is not automatic: it can be realised only if the growing working-age population is given adequate education, skills and employment. If young people remain uneducated or unemployed, they become dependents rather than earners, and the dividend is lost.
6. What is meant by the ‘sex ratio’? What are some of the implications of a declining sex ratio? Do you feel that parents still prefer to have sons rather than daughters? What, in your opinion, could be some of the reasons for this preference?
ANSWERSex ratio: the sex ratio is the number of females per 1,000 males in a given area at a specified time. Historically, all over the world there have been slightly more females than males, but India has had a declining sex ratio for over a century — from 972 in 1901 to 933 in 2001, rising slightly to 943 in 2011. More alarming is the fall in the child sex ratio (0–6 years), which dropped to 919 in 2011.Implications of a declining sex ratio: A falling sex ratio, especially among children, points to a deep social bias against girls — reflected in the neglect of girl babies, sex-selective abortion and even female infanticide. In the long run it disturbs the gender balance of society, creates a shortage of women of marriageable age, can lead to the buying and trafficking of brides and to greater violence against women, and signals the low status of women in society.Do parents still prefer sons? (own opinion): Yes, in many parts of India a preference for sons still persists, as shown by the low child sex ratios even in prosperous states such as Haryana, Punjab and Delhi — proving that the problem is not due to poverty or ignorance alone.Possible reasons for son preference (own opinion): sons are often seen as those who continue the family name and inherit property; they are expected to support parents in old age and perform last rites; daughters are regarded as an economic burden because of dowry and the cost of their marriage; and patriarchal customs value males more highly than females. These social attitudes — rather than poverty — drive the preference, which is why the chapter stresses that a lasting solution depends mainly on how social attitudes evolve, supported by laws such as the Pre-natal Diagnostic Techniques (Regulation and Prevention of Misuse) Act and programmes like ‘Beti Bachao, Beti Padhao’.
Extra Practice Questions
Short Answer Type Questions
Q1. Distinguish between formal demography and social demography.
ANSWERFormal demography is primarily concerned with the measurement and quantitative analysis of the components of population change, using a developed mathematical methodology to forecast population growth and composition. Social demography (or population studies) enquires into the wider social, economic and political causes and consequences of population structure and change, tracing the social reasons behind population trends.
Q2. What is meant by the ‘replacement level’ of population?
ANSWERThe replacement level is the rate of growth required for new generations to just replace the older ones that are dying out, so that the population neither grows nor shrinks. It is reached when the rate of natural increase (birth rate minus death rate) is effectively zero; a total fertility rate of about 2.1 corresponds to this level.
Q3. What is the dependency ratio and why does a rising dependency ratio cause concern?
ANSWERThe dependency ratio compares the dependent population (children below 15 and elderly above 64) with the working-age population (15–64), usually expressed as a percentage. A rising dependency ratio is a cause for worry, especially in ageing societies, because a relatively smaller proportion of working people has to bear the burden of supporting a larger proportion of dependents.
Q4. Why is the child sex ratio considered more alarming than the overall sex ratio?
ANSWERThe child sex ratio (0–6 years) has fallen much more sharply than the overall sex ratio — from 945 in 1991 to 927 in 2001 and 919 in 2011. Because it cannot be explained by maternal mortality, this steep fall directly reveals the differential treatment of girl babies through neglect, sex-selective abortion and female infanticide, making it a more direct measure of bias against girls.
Q5. Name two preventive checks and two positive checks mentioned in Malthus’s theory.
ANSWERPreventive checks (voluntary measures to limit population) include postponing marriage and practising sexual abstinence or celibacy. Positive checks (nature’s ways of reducing population) include famines and epidemic diseases that cause mass deaths.
Long Answer Type Questions
Q1. Explain why Malthus’s theory of population was proved wrong, and how it was criticised by later scholars.
ANSWERMalthus predicted that population would always outstrip food production, condemning humanity to poverty kept in check only by famines and diseases. His theory was, however, refuted by the historical experience of European countries. In the latter half of the nineteenth century and the first quarter of the twentieth, both food production and standards of living continued to rise despite rapid population growth, while birth rates declined and epidemics were controlled — so the predicted catastrophe did not occur. The substantial increase in the productivity of agriculture, through new technology, was a major reason. Malthus was also criticised by liberal and Marxist scholars for wrongly blaming poverty on population growth. They argued that poverty and starvation were really caused by the unequal distribution of economic resources: an unjust social system allowed a wealthy minority to live in luxury while the majority were forced into poverty. Thus the problem lay not in numbers but in how resources were shared.
Q2. Discuss the size and growth of India’s population during the twentieth century, with reference to the demographic transition.
ANSWERIndia is the second most populous country in the world after China, with a population of about 121 crores (1.21 billion) according to the Census of India 2011. Between 1901 and 1951 the average annual growth rate was modest, never exceeding 1.33%, and between 1911 and 1921 there was even a negative growth rate of −0.03% because of the influenza epidemic of 1918–19, which killed about 17 million people (around 5% of the population). After independence the growth rate rose sharply, reaching about 2.2% during 1961–1981, before slowly declining; by 2011 the decadal growth rate had fallen to 17.7%. The impact of the demographic transition is clearly seen in India: before 1931 both birth and death rates were high, but after that ‘transitional moment’ the death rate fell sharply (because of better control of famines and epidemics, mass vaccination and improved sanitation) while the birth rate fell only slightly. This widening gap between a fast-falling death rate and a slow-falling birth rate produced rapid population growth — India’s ‘population explosion’ — though the transition is still not complete.
Year
Total Population (in millions)
Average Annual Growth Rate (%)
1901
238
–
1921
251
−0.03
1951
361
1.25
1971
548
2.22
1981
683
2.20
2001
1028
1.95
2011
1210
1.63
(Source of figures: Table 1, NCERT — The Population of India and its Growth During the 20th Century.)
Q3. What is the ‘demographic dividend’? Explain why it is an opportunity for India but not an automatic benefit.
ANSWERThe demographic dividend is the benefit that flows from a changing age structure when the proportion of working-age people (roughly 15–64 years) rises relative to dependents (children and the elderly), lowering the dependency ratio and creating the potential for higher growth and prosperity. India is well placed to enjoy this dividend because it is one of the youngest countries in the world — a third of its population was below 15 in 2011, and in 2020 the average Indian was only about 29 years old, compared with 37 in China and the United States, 45 in Western Europe and 48 in Japan. This implies a large and growing labour force. However, the dividend is not automatic: a rising working-age population yields growth only if its members are healthy, well educated, suitably skilled and gainfully employed. If new entrants to the labour force remain uneducated, their productivity stays low; if they remain unemployed, they become dependents rather than earners. India’s recent experience of a sharp fall in employment generation, even for the young, shows that the advantage of a young labour force is not being fully exploited. The dividend is also temporary, since today’s large working-age group will eventually become old and dependent. Realising it therefore requires planned development — heavy investment in education, health and job creation — rather than reliance on market forces alone.
MCQs & Assertion–Reason
1. The word ‘demography’ is of Greek origin and combines ‘demos’ with which other word?
For each Assertion–Reason question, choose: (A) Both true and the Reason correctly explains the Assertion; (B) Both true but the Reason is not the correct explanation; (C) Assertion true, Reason false; (D) Assertion false, Reason true.
A-R 1. Assertion: The death rate usually falls faster than the birth rate during the demographic transition.
Reason: The birth rate is a socio-cultural phenomenon that changes slowly, while the death rate responds quickly to medical and public-health measures.
A-R 2. Assertion: Malthus believed famines and epidemics were inevitable.
Reason: He held that population grows geometrically while food production grows only arithmetically, so positive checks become necessary.
A-R 3. Assertion: The demographic dividend automatically guarantees economic growth for India.
Reason: A large working-age population raises productivity only if it is provided with education, skills and employment.
A-R 4. Assertion: India’s declining child sex ratio cannot be explained by maternal mortality.
Reason: The fall in the child sex ratio is linked to the differential treatment of girl babies, including sex-selective abortion and neglect.
A-R 5. Assertion: Kerala has a higher fertility rate than Bihar.
Reason: Higher female literacy and better health facilities are associated with lower fertility rates.
Answer key: 1-(A), 2-(A), 3-(D), 4-(A), 5-(D).
Exam Tips & Common Mistakes
How to score full marks in this chapter
Learn the precise definitions of every indicator — birth rate and death rate (per 1,000 population), fertility rate (per 1,000 women aged 15–49), infant mortality (per 1,000 live births), maternal mortality (per 1,00,000 live births), sex ratio (females per 1,000 males) and dependency ratio — with the correct denominators. For theory questions, present the demographic transition in clear stages and explain the ‘population explosion’ as the gap between a fast-falling death rate and a slow-falling birth rate. Use real NCERT data to impress examiners: India’s 121-crore population (2011), the negative growth of −0.03% in 1911–21 due to the influenza epidemic, the child sex ratio of 919 (2011), and the demographic-dividend statistics. Always add a thoughtful ‘in your opinion’ section for questions 4 and 6, linking regional differences and son preference to female education and social attitudes.
Common mistakes to avoid
Confusing the birth/death rate (per 1,000 population) with the fertility rate (per 1,000 women aged 15–49).
Defining the sex ratio as males per 1,000 females — it is females per 1,000 males.
Mixing up the overall sex ratio (943 in 2011) with the child sex ratio 0–6 years (919 in 2011).
Reversing Malthus’s progressions — population grows geometrically, food only arithmetically.
Treating the demographic dividend as automatic — it needs education, skills and employment, and is temporary.
Saying maternal mortality explains the declining child sex ratio — the text rules this out; the cause is the differential treatment of girls.
Forgetting that the ‘in your opinion’ parts of questions 4 and 6 carry marks — never leave them blank.
Frequently Asked Questions
What is Chapter 2 of Class 12 Sociology (Indian Society) about?
Chapter 2, The Demographic Structure of the Indian Society, introduces demography and explains the Malthusian theory and the theory of demographic transition, defines indicators such as birth rate, death rate, fertility rate, sex ratio, age structure and dependency ratio, and applies them to India — its population size and growth, young age structure and demographic dividend, declining child sex ratio, literacy, rural–urban differences and population policy.
Why is the transition period called a ‘population explosion’?
During the transitional (second) stage of demographic transition, death rates are brought down quickly through disease control, public health and better nutrition, while birth rates remain high because reproductive behaviour changes only slowly. The widening gap between a fast-falling death rate and a slow-falling birth rate produces very high population growth — a ‘population explosion’.
What is the heading of the exercise section in this chapter?
The end-of-chapter exercise in Indian Society Chapter 2 is headed Questions and contains 6 numbered questions, all answered step by step on this page.
