GeographyCBSE Class 12 · The World Population: Distribution, Density and Growth

Demographic Transition Theory and Population Control (Class 12 Geography, Chapter 2)

Updated 15 October 2026 · Fact-checked

Demographic transition theory says a region shifts from high birth and death rates to low birth and death rates as society changes from rural, agrarian and illiterate to urban, industrial and literate. It has three stages: high fluctuating (slow growth), expanding (fast growth as deaths fall first) and low fluctuating (stable or slow growth).

Understand Demographic Transition Theory

Why this topic matters. The DTT graph appears as a case-based or source-based item almost every session, and 3-mark questions ask you to explain a stage or compare stages I and III. Population control measures and Malthus come as 1-mark items.

1. The idea. The theory can describe and predict a region's population. As society moves from rural, agrarian and illiterate to urban, industrial and literate, birth and death rates change from high-high to low-low. The stages together are called the demographic cycle.

2. The three stages.

	Stage I: High fluctuating	Stage II: Expanding	Stage III: Low fluctuating
Birth rate (fertility)	High	High at first, then declines	Low
Death rate (mortality)	High, fluctuating	Falls (sanitation, health)	Low
Population growth	Slow	High net addition	Stable or slow
Society	Agricultural; large families an asset; illiterate; low technology; low life expectancy	Changing	Urbanised, literate, high technical know-how
Why	Many births to make up for deaths from epidemics and uncertain food supply	Deaths fall before births, so the gap widens	Families deliberately limit size

Two hundred years ago all countries were in stage I.
Today different countries are at different stages.
NCERT's Fig. 2.2 places rainforest tribes and Bangladesh under stage I; Peru, Sri Lanka and Kenya under stage II; and Canada, Japan and the USA in stage III.
The lesson NCERT draws: humans are flexible and can adjust their fertility.

3. Reading the graph. The x-axis is time; the y-axis is CBR and CDR. The shaded gap between the birth-rate line and the death-rate line is the natural increase.

Stage I: both lines high and close together, wavy (fluctuating), so the gap is small.
Stage II: the death line falls first; the birth line stays high, then begins to fall. The gap is widest around the end of the first part of stage II, where deaths have fallen but births are still high.
Stage III: both lines low and close again; the gap is small.

Diagram checklist (draw and label).

Axes: time (x), birth and death rate per thousand (y).
Two lines: birth rate and death rate.
Three divisions: I high fluctuating, II expanding, III low fluctuating.
Shade the natural increase between the lines.
Under the axis write 'rural, agrarian' at the left and 'urban, industrial' at the right.

4. Population control measures.

Family planning means spacing or preventing the birth of children. Access to family planning services helps limit growth and improves women's health.
Other measures: propaganda (awareness campaigns), free availability of contraceptives and tax disincentives for large families.
Thomas Malthus (1798): population would grow faster than food supply; any further increase would end in a population crash through famine, disease and war. Preventive checks are better than these physical checks.
For the sustainability of resources, rapid population increase must be controlled.

5. Linking DTT to control. Stage II countries add people fastest, so control measures matter most there. Stage III shows that when people become urban, literate and technically skilled, they limit family size on their own.

Demographic Transition Theory: key facts

Stage names: Stage I high fluctuating
Stage II expanding
Stage III low fluctuating; Names used in NCERT Fig. 2.2.
Birth and death pattern: 1.High births, high deaths
2.high births, falling deaths
3.low births, low deaths; Natural increase is small, then large, then small.
Society at each stage: Stage I rural, agrarian, illiterate, low technology
Stage II improving sanitation and health
Stage III urban, literate, high technical know-how, controlled family size; Socio-economic conditions questions come from this row.
Fig. 2.2 examples: Stage I rainforest tribes, Bangladesh
Stage II Peru, Sri Lanka, Kenya
Stage III Canada, Japan, USA; Different countries are at different stages today.
Control measures: Family planning (spacing or preventing births)
propaganda
free contraceptives
tax disincentives for large families; Malthus (1798): population outruns food; preventive checks better than famine, disease, war.

Stage I	high fluctuating
Stage II	expanding
Stage III	low fluctuating

Stage I	rural, agrarian, illiterate, low technology
Stage II	improving sanitation and health
Stage III	urban, literate, high technical know-how, controlled family size

Stage I	rainforest tribes, Bangladesh
Stage II	Peru, Sri Lanka, Kenya
Stage III	Canada, Japan, USA

How to answer Demographic Transition Theory questions

Expect a case or graph with 1-mark MCQs (which stage has high growth, primitive stage, widest gap), 3-mark questions explaining one stage or contrasting stages I and III, and 1-mark items on Malthus or family planning.

1Identify the stage from the clue: primitive, agrarian = I; falling deaths, big gap = II; urban, literate, low rates = III.
2Describe each stage on three points: birth rate, death rate, population growth.
3Add the reason: epidemics and food supply (I), sanitation and health (II), deliberate family-size control (III).
4For graph questions, look at the gap between the two lines, not the height of either line.
5For control measures, list family planning plus at least two other measures and mention Malthus if asked about theory.

Demographic Transition Theory in real life

The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Stage II: deaths fall before births

Suppose a remote district gets clean piped water, a primary health centre and vaccination drives in one decade, but families still prefer four or five children because farm work needs hands.

What happens to its population growth, and in which stage of demographic transition is it?

Try it first, then show the solutionSolution

Sanitation and health care cut the death rate quickly.
Birth rate stays high because large families are still valued.
The gap between births and deaths widens, so net addition is high.

Answer: Population grows fast; the district is in stage II (expanding), early part, where mortality has fallen but fertility is still high.

Memory hook: Medicine arrives before family planning: the population expands.

Tricks to remember Demographic Transition Theory

Short memory aids. Say each one aloud once, then use it on a question the same day.

HEL: High, Expanding, Low
Stage names in order: High fluctuating, Expanding, Low fluctuating, like 'HELp'.
Use it when: Naming the stages.
Deaths drop first
In stage II the death line 'dives' before the birth line 'bends'; the gap between them is the boom.
Use it when: Explaining why stage II grows fastest.
Malthus: Food walks, people run
Population runs ahead of food; the crash comes through Famine, Disease, War (FDW).
Use it when: Malthus MCQs.

Demographic Transition Theory: solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Identifying the primitive stage · 1 mark · MCQBoard level

In a remote forest village, families have seven or eight children, yet frequent epidemics and an uncertain food supply keep the population almost unchanged for decades. The village is in:
(A) Stage I: high fluctuating
(B) Stage II: expanding
(C) Stage III: low fluctuating
(D) A stage beyond stage III

Try it first, then show the solutionSolution

High births cancelled by high deaths from epidemics and food shortage, in a low-technology society, mark stage I (1 mark).

Answer: (A) Stage I: high fluctuating

Example 2: Assertion and reason on stage II · 1 mark · Assertion-reasonHarder board level

Assertion (A): The net addition to population is high in stage II of demographic transition.
Reason (R): Mortality declines because of better sanitation and health, while fertility remains high in the beginning.
(A) Both (A) and (R) are true and (R) is the correct explanation of (A).
(B) Both (A) and (R) are true but (R) is not the correct explanation of (A).
(C) (A) is true but (R) is false.
(D) (A) is false but (R) is true.

Try it first, then show the solutionSolution

Both true; the widening gap between births and deaths is exactly why net addition is high (1 mark).

Answer: (A) Both (A) and (R) are true and (R) is the correct explanation of (A).

Example 3: Stage I versus stage III · 3 marks · Short answerBoard level

Differentiate between stage I and stage III of demographic transition theory on three points. (3 marks)

Try it first, then show the solutionSolution

Rates: high fertility and mortality in I; both low in III (1 mark).
Growth: slow in I because deaths cancel births; stable or slow in III because people limit births (1 mark).
Society: agricultural, illiterate, low technology, low life expectancy in I; urbanised, literate, high technical know-how in III (1 mark).

Answer: Stage I (high fluctuating) has high birth and death rates; people have many children to make up for deaths from epidemics and uncertain food supply, so growth is slow. Most people are farmers, large families are an asset, literacy, technology and life expectancy are low. Stage III (low fluctuating) has low birth and death rates and a stable or slowly growing population. People are urbanised and literate, have high technical know-how and deliberately control family size.

Example 4: Reading the graph · 1 mark · MCQHarder board level

On a demographic transition graph, the death-rate line has already dropped steeply but the birth-rate line is still close to its stage I level. At this point the natural increase is:
(A) at its smallest, as in stage I
(B) close to its widest
(C) negative
(D) the same as in stage III

Try it first, then show the solutionSolution

Deaths have fallen while births are still high, which is the end of the first part of stage II; the gap (natural increase) is near its maximum and narrows only once births begin to fall (1 mark).

Answer: (B) close to its widest

Example 5: Explaining the third stage · 3 marks · Short answerHarder board level

A country's birth rate and death rate have both settled at around 10 per thousand, and most of its people are urban and literate. Identify its stage of demographic transition, describe that stage and state what it shows about human behaviour. (3 marks)

Try it first, then show the solutionSolution

Birth and death rates both decline considerably (1 mark).
Population is stable or grows slowly; society is urbanised, literate, technically skilled (1 mark).
People deliberately control family size: humans are flexible and can adjust fertility (1 mark).

Answer: In the third stage, low fluctuating, both fertility and mortality fall considerably and stay low, so the population is either stable or grows slowly. Society by now is urbanised and literate, with high technical know-how, and families deliberately limit their size. This shows that human beings are extremely flexible and can adjust their fertility to changing social and economic conditions.

Example 6: Long answer: DTT and control · 5 marks · Long answerHOTS / competency

"The demographic transition model helps us both explain a region's present population and forecast its future." Examine the statement and suggest measures for a country in the expanding stage. (5 marks)

Try it first, then show the solutionSolution

Theory: population moves from high-high to low-low as society moves from rural agrarian illiterate to urban industrial literate (1 mark).
Stage I and stage III described briefly (1 mark).
Stage II: falling mortality, high fertility, high net addition; predicts fast growth until fertility falls (1 mark).
Prediction: a country's stage tells whether growth will speed up, slow or stabilise; countries differ today (1 mark).
Measures for stage II: family planning services, awareness, free contraceptives, tax disincentives; Malthus' warning on food (1 mark).

Answer: Demographic transition theory holds that a region's population shifts from high birth and death rates to low ones as society changes from rural, agrarian and illiterate to urban, industrial and literate. In stage I (high fluctuating), many births offset deaths from epidemics and uncertain food, so growth is slow. In stage II (expanding), sanitation and health care cut deaths while births stay high at first, so population rises fast. In stage III (low fluctuating), both rates are low and families are deliberately small, so population is stable or grows slowly.

Because the stages follow a sequence, knowing a country's stage lets us predict its course: a stage II country will keep growing fast until fertility falls, while a stage III country will stay stable. Today different countries are at different stages.

For a country in the expanding stage, control measures are vital: wide access to family planning (which also improves women's health), awareness campaigns, free contraceptives and tax disincentives for large families. Malthus warned that population can outrun food supply; preventive checks are better than the crash that famine, disease and war would bring.

Where students lose marks in Demographic Transition Theory

The slips examiners see most often, and what to write instead.

Mistake: Saying stage I has high growth
High birth rate is confused with high growth.
Wrong working
Stage I has the highest growth because birth rate is highest.
Right working
Stage I growth is slow because high deaths cancel high births.
Do this: Growth = the gap, not the birth rate.
Usually costs: 1 mark.
Mistake: Describing stage II as 'births fall first'
Order of decline is reversed.
Wrong working
In stage II birth rate falls, so population rises.
Right working
In stage II death rate falls first while birth rate stays high, so population rises.
Do this: Deaths drop first.
Usually costs: 1-2 marks.
Mistake: Missing the society description
Students write rates only.
Wrong working
Stage III: low birth rate and low death rate.
Right working
Stage III: low rates; urbanised, literate, high technical know-how; deliberate control of family size.
Do this: Three points: rates, growth, society.
Usually costs: 1 mark in 3-mark answers.
Mistake: Wrong year or claim for Malthus
Guessing.
Wrong working
Malthus (1898) said food grows faster than population.
Right working
Malthus (1798) said population would grow faster than food supply.
Do this: Food walks, people run; 1798.
Usually costs: 1 mark.

Exam tips

Asked in: 2024 board paper 64/1/1 Q15-Q17 (case study, 1 mark each, which stages have high or slow growth); 2025 board paper 64/4/1 Q15 and Q16 (1 mark each, primitive stage, widest birth-death gap); 2025 board paper 64/6/1 Q22 (3 marks, DTT graph: stage II growth, stages I and III); 2026 board paper 64/4/1 Q23 (3 marks, third stage from a diagram); 2025-26 sample paper Q2 (1 mark, identify stage III); 2026-27 sample paper Q8 (1 mark, Malthus); 2023 board paper 64/1/1 Q3 (1 mark, objectives of family planning). The answers on this page are our own.
Use NCERT's stage names (high fluctuating, expanding, low fluctuating) along with the numbers.
In a graph question, quote what the graph shows (lines close together, gap widening) before explaining.
Visually impaired candidates get a non-graph version; the content needed is the same.

Practice questions on Demographic Transition Theory

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

Q1 · 1 mark · MCQBoard level
Which stage of demographic transition is called 'expanding'?
(A) Stage I
(B) Stage II
(C) Stage III
(D) None of these
Hint
HEL.
Answer
(B) Stage II.
Q2 · 1 mark · MCQHarder board level
Malthus (1798) warned that if population kept outrunning food supply it would crash. Which one of the following was NOT one of the physical checks he expected to cause that crash?
(A) Famine
(B) Disease
(C) War
(D) Tax disincentives for large families
Hint
Famine, Disease, War (FDW) versus a modern control measure.
Answer
(D) Tax disincentives for large families: this is a population control measure listed by NCERT, not one of Malthus' physical checks.
Q3 · 2 marks · Very short answerBoard level
A country records a birth rate of 11 and a death rate of 9 per thousand, and most of its workers are in factories and offices in cities. In which stage of demographic transition is it? Give one more feature of that stage. (2 marks)
Hint
Low-low.
Answer
Stage III (low fluctuating). Another feature: the population is literate with high technical know-how and families deliberately limit their size; growth is stable or slow.
Q4 · 2 marks · Very short answerHarder board level
Why do people in stage I have many children even though population grows slowly? (2 marks)
Hint
Compensation and labour.
Answer
Because many children die from epidemics and variable food supply, families have more children to make up for deaths, and in an agricultural economy large families are an asset as workers. High deaths cancel high births, so growth stays slow.
Q5 · 3 marks · Short answerHOTS / competency
Suppose a country's birth rate is 38 and death rate 12 per thousand, and both were 40 and 36 thirty years ago. Identify the stage then and now, and explain the change in growth. (3 marks)
Hint
Compute the gaps: 4 then, 26 now.
Answer
Thirty years ago: births 40 and deaths 36, both high, natural increase only 4 per thousand: stage I (high fluctuating). Now: births 38 but deaths 12, a natural increase of 26 per thousand: stage II (expanding), early part. Deaths have fallen sharply, probably through better sanitation and health, while births have barely changed, so growth has accelerated.
Q6 · 3 marks · Short answerHarder board level
List four population control measures mentioned by NCERT and explain how family planning helps beyond limiting numbers. (3 marks)
Hint
Women's health.
Answer
Measures: family planning (spacing or preventing births), propaganda or awareness, free availability of contraceptives, and tax disincentives for large families. Family planning also improves women's health, because spacing births reduces the strain of frequent pregnancies, and it gives families more resources per child.
Q7 · 5 marks · Long answerHOTS / competency
"Human beings are extremely flexible and are able to adjust their fertility." Use the stages of demographic transition to support this statement and discuss whether control measures are still needed. (5 marks)
Hint
Fertility changes from stage I to III; but stage II can last long.
Answer
In stage I, people keep fertility high because deaths are high and children are needed for farm work. In stage II, fertility stays high at first but then declines as people see that more children survive. In stage III, urban, literate and technically skilled people deliberately limit family size, so both rates are low. This change in behaviour across stages shows that people adjust fertility to their social and economic conditions. Yet control measures are still needed, because the adjustment takes time: while a country stays in stage II, the gap between births and deaths adds very large numbers and strains resources, as Malthus warned. Family planning services, awareness, free contraceptives and tax disincentives can speed up the move to stage III and protect the sustainability of resources.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

1.What is the demographic cycle?Show answer
The stages of demographic transition taken together.
2.Why does mortality fall in stage II?Show answer
Improvements in sanitation and health conditions.
3.In which stage were all countries two hundred years ago?Show answer
Stage I.
4.When did Malthus give his theory?Show answer
1798.
5.Name two control measures besides family planning.Show answer
Any two: propaganda, free availability of contraceptives, tax disincentives for large families.

Demographic Transition Theory: frequently asked questions

What are the three stages of demographic transition?

Stage I, high fluctuating (high births and deaths, slow growth); stage II, expanding (deaths fall, births high, fast growth); stage III, low fluctuating (low births and deaths, stable or slow growth).

In which stage is population growth highest?

In stage II, especially at the end of its first part, when deaths have fallen but births are still high.

What did Malthus say about population?

In 1798 he said population would grow faster than food supply and that further increase would cause a crash through famine, disease and war; preventive checks are better than such physical checks.

What are population control measures?

Family planning (spacing or preventing births), awareness campaigns, free availability of contraceptives and tax disincentives for large families.