National and State Level Patterns of Population Distribution: ISC Class 12 Geography

What National and State Level Patterns of Population Distribution is about

Weightage: CISCE publishes no chapter or unit weightage for ISC Geography. National and State Level Patterns of Population Distribution is part of 2. Population and Human settlements (ii) of the 2027 syllabus and can be asked anywhere in the 70-mark Paper I (Section A one-mark and map items, Section B 4-mark short answers, Section C 7-mark long answers).Source: CISCE ISC Geography (853) syllabus, examination year 2027; ISC 2027 specimen question paper

Key concepts

Census and index of concentration

Census: the official, complete enumeration of a country's population at a fixed reference date, recording demographic, social and economic details of every person. India's census is decennial; the latest with results is 2011.

Index of concentration (as used in the ISC syllabus): a state's share of India's total population, expressed as a percentage. It tells us where the nation's people are concentrated, independent of the state's area.

Census 2011 shares (learn the extremes):
1. Highest: Uttar Pradesh, about 16.5 per cent (roughly one Indian in six).
2. Next: Maharashtra (about 9.3 per cent), Bihar (about 8.6 per cent), West Bengal (about 7.5 per cent), undivided Andhra Pradesh (about 7.0 per cent). These five states together held almost half of India's population.
3. Lowest among states: Sikkim, about 0.05 per cent.

Contrast with area: Rajasthan is the largest state by area (about 10.4 per cent of India) but holds only about 5.7 per cent of the population; Uttar Pradesh has about 7.3 per cent of the area but 16.5 per cent of the people. Comparing share of population with share of area shows how concentrated people are.

Worked example

[2] What is meant by the index of concentration of population? Name the states with the highest and lowest index according to the 2011 Census. (Recall)

Try it first, then show the solutionSolution

1. Meaning: a state's percentage share of India's total population - 1 mark.
2. Highest: Uttar Pradesh (about 16.5 per cent); lowest: Sikkim - 1 mark.

Answer: The index of concentration is the percentage of India's total population that lives in a state. In 2011 it was highest in Uttar Pradesh (about 16.5 per cent) and lowest in Sikkim (about 0.05 per cent).

Arithmetic and physiological density

Arithmetic density = total population / total area. It is the usual 'density of population', in persons per sq km. India 2011: 382 per sq km (325 in 2001).

Physiological density = total population / net cultivated (net sown) area. It shows the pressure of population on the land that actually produces food. India's net sown area is about 140 million hectares (about 1.4 million sq km), so physiological density is well over double the arithmetic density, roughly 850-870 persons per sq km of cultivated land.

Why two measures?
1. Arithmetic density can mislead: a state with large deserts, forests or mountains may have a low arithmetic density but high pressure on its small farmed area.
2. Physiological density is high where cultivable land is scarce, for example in hilly states (Kerala, the north-eastern states) and where population is very large.
3. A rise in physiological density over time signals increasing pressure on farmland, smaller holdings and the need for intensive farming or non-farm jobs.

State extremes (arithmetic density, 2011): highest state Bihar, 1,106; then West Bengal (about 1,028) and Kerala (860). Lowest: Arunachal Pradesh, 17; then Mizoram (52) and Sikkim (86). Among Union Territories, the NCT of Delhi had 11,320 (the highest anywhere) and the Andaman and Nicobar Islands 46.

Worked example

[4] Distinguish between arithmetic and physiological density. Why is physiological density a better indicator of population pressure in India? (Analyse)

Try it first, then show the solutionSolution

1. Arithmetic density: total population divided by total area - 1 mark.
2. Physiological density: total population divided by net cultivated area - 1 mark.
3. Arithmetic density includes mountains, deserts and forests where few can live or farm - 1 mark.
4. Physiological density shows pressure on food-producing land, which matters in a mainly agricultural country - 1 mark.

Answer: Arithmetic density is the number of persons per unit of total area, while physiological density is the number per unit of net cultivated area. Arithmetic density averages people over mountains, deserts and forests as well as farmland, so it can understate pressure. Physiological density measures how many people depend on each unit of food-producing land, which is the real pressure in a largely agricultural country like India.

Spatial pattern of population distribution in India

Density classes (Census 2011, arithmetic density):

1. High density (above 500 per sq km): the Ganga plain and delta (Bihar, West Bengal, Uttar Pradesh), Kerala, and the irrigated plains of Punjab and Haryana; Tamil Nadu (about 555). Also the city-states: Delhi, Chandigarh, Puducherry, Lakshadweep.
2. Moderate density (250-500): Jharkhand, Assam, Goa, Maharashtra, Tripura, Karnataka, Gujarat, undivided Andhra Pradesh, Odisha. Mostly plateaus with mixed farming, mining and industry, or river valleys within otherwise difficult terrain.
3. Low density (below 250): Madhya Pradesh, Rajasthan, Chhattisgarh, Uttarakhand, Himachal Pradesh, Jammu and Kashmir, and the north-eastern hill states. Lowest of all, Arunachal Pradesh (17).

Broad picture: a dense belt along the northern plains from Punjab to West Bengal, dense coastal strips (especially Kerala and the deltas of the east coast), moderate plateaus, and sparse deserts, Himalayan and north-eastern hills and forested plateaus.

Worked example

[4] Classify Indian states into high and low density regions with two examples each and give one reason for each class. (Understand)

Try it first, then show the solutionSolution

1. High: Bihar and West Bengal (or Kerala, Uttar Pradesh) - 1 mark.
2. Reason: fertile alluvial plains, water, intensive agriculture - 1 mark.
3. Low: Arunachal Pradesh and Mizoram (or Rajasthan, Himachal Pradesh) - 1 mark.
4. Reason: rugged relief, dense forest or aridity, poor accessibility - 1 mark.

Answer: High-density states (over 500 per sq km) include Bihar and West Bengal, which lie on fertile, well-watered alluvial plains that support intensive farming. Low-density states (under 250) include Arunachal Pradesh and Mizoram, where rugged mountains, dense forests and poor transport limit farming and settlement.

Factors influencing distribution: landforms and climate

1. Landforms (relief)

• Plains are flat, easy to cultivate, irrigate and build on: the Indus-Ganga-Brahmaputra plains and the coastal deltas (Mahanadi, Godavari, Krishna, Kaveri) are densely populated.
• Mountains have steep slopes, thin soils, cold climate and difficult transport: the Himalayas and north-eastern hills are thinly populated, with people concentrated in valleys (Kashmir valley, Imphal valley).
• Plateaus are intermediate: moderate density where soils are fertile (black soil of the Deccan) or minerals support industry (Chota Nagpur); low on rocky, forested parts.

2. Climate

• Moderate, humid climates with reliable rainfall attract dense populations (Ganga plain, Kerala).
• Extremes repel: the hot, dry Thar Desert of western Rajasthan and the cold desert of Ladakh have very low densities.
• Very heavy rainfall with dense forest and disease (parts of the north-east) also limits settlement.

3. Related physical factors: fertile soils (alluvial, black, deltaic), availability of fresh water (rivers, groundwater), and minerals that create mining and industrial towns.

Worked example

[4] Explain how landforms and climate influence the distribution of population in India, with examples. (Understand)

Try it first, then show the solutionSolution

1. Plains: flat, fertile, easy to irrigate and build on; Ganga plain is dense - 1 mark.
2. Mountains and hills: steep, thin soils, poor access; Himalayas and north-east sparse - 1 mark.
3. Moderate, rainy climate supports farming and dense settlement (Kerala, Ganga plain) - 1 mark.
4. Extreme climates repel settlement: Thar Desert, Ladakh - 1 mark.

Answer: Flat, fertile plains such as the Ganga plain are easy to cultivate, irrigate and build on, so they are densely peopled, while steep, thinly soiled and poorly connected mountains like the Himalayas and the north-eastern hills are sparse. Moderate climates with reliable rainfall, as in Kerala and the Ganga plain, support intensive farming and dense settlement, while the hot desert of western Rajasthan and the cold desert of Ladakh have very few people.

Factors influencing distribution: accessibility and level of development

1. Accessibility

• Areas served by roads, railways, ports and airports attract settlement, trade and industry: the coasts and the great plains.
• Remote, isolated areas (high Himalaya, Andaman and Nicobar interiors, parts of Arunachal) stay thinly populated.
• Rivers have historically been routes and water sources; most large cities lie on rivers or coasts.

2. Level of development (economic and social factors)

• Industrialisation and urbanisation: industrial and urban regions (Mumbai-Pune, Hooghly belt, Delhi region, Ahmedabad, Bengaluru, Chennai) pull migrants and record very high densities.
• Irrigation and agricultural development: canal irrigation turned Punjab and Haryana into dense farming regions.
• Mining: Chota Nagpur plateau towns (Dhanbad, Jamshedpur) grew around coal and iron ore.
• Services and administration: capital cities attract people.

3. Historical and social factors: early, continuous settlement in the Ganga plain; political stability; refugee movements after Partition into Punjab, Delhi and West Bengal.

Note: physical factors set the broad pattern; economic development explains changes within it, such as rising densities around industrial cities.

Worked example

[4] 'Physical factors decide the broad pattern of population, but economic development modifies it.' Explain with two examples of each. (Analyse)

Try it first, then show the solutionSolution

1. Physical: fertile plains of the Ganga attract dense population - 1 mark.
2. Physical: deserts and mountains (Thar, Himalayas) repel it - 1 mark.
3. Economic: industrial and urban regions (Mumbai, Delhi, Hooghly belt) draw migrants - 1 mark.
4. Economic: irrigation (Punjab) or mining (Chota Nagpur) raises density in otherwise moderate areas - 1 mark.

Answer: The broad pattern follows physical geography: the fertile, well-watered Ganga plain is crowded, while the Thar Desert and the Himalayas are sparse. Economic development then modifies this: industrial and urban regions such as Mumbai, Delhi and the Hooghly belt draw migrants and reach very high densities, and canal irrigation in Punjab and mining in the Chota Nagpur plateau have raised densities above what relief and climate alone would support.

Comparing density at the state level

Use paired comparisons with reasons.

1. Bihar (1,106) versus Arunachal Pradesh (17): flat alluvial Ganga plain, water and long settled agriculture versus rugged mountains, dense forest, heavy rainfall and poor accessibility.
2. Kerala (860) versus Rajasthan (200): humid coastal lowland with two monsoons, fertile soils, coconut and spice farming, fishing, remittances and high social development versus arid and semi-arid land with scarce water.
3. West Bengal (about 1,028) versus Madhya Pradesh (236): deltaic plain with rice farming, Kolkata and the Hooghly industrial belt versus a large forested plateau with poorer soils in parts.
4. Punjab (551) versus Himachal Pradesh (123): irrigated plain versus mountains.
5. Delhi (11,320) versus Andaman and Nicobar Islands (46): a capital metropolis versus scattered forested islands.

Tip: when comparing, give the figures, then one physical and one economic reason on each side.

Worked example

[4] Compare the population density of Bihar and Arunachal Pradesh and explain the difference. (Analyse)

Try it first, then show the solutionSolution

1. Figures: Bihar 1,106 per sq km, highest among states; Arunachal Pradesh 17, lowest (2011) - 1 mark.
2. Bihar: flat fertile alluvial plain, plenty of water - 1 mark.
3. Bihar: long history of intensive agriculture; high birth rate - 1 mark.
4. Arunachal: rugged mountains, dense forest, heavy rain and poor accessibility - 1 mark.

Answer: In 2011 Bihar had the highest density among states (1,106 per sq km) and Arunachal Pradesh the lowest (17). Bihar lies on the flat, fertile and well-watered Ganga plain, has a long history of intensive farming and a high birth rate. Arunachal Pradesh is mountainous and densely forested, with heavy rainfall, thin soils, little flat land and poor transport, so few people can live there.

National and State Level Patterns of Population Distribution in real life

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

Topics in this chapter

• Index of Concentration, Density and Factors of Population Distribution

National and State Level Patterns of Population Distribution: key facts

Arithmetic density

Total population / total area (persons per sq km)

India 2011: 382.

Physiological density

Total population / net cultivated area (persons per sq km of cultivated land)

Shows pressure on farmland; much higher than arithmetic density.

Index of concentration

State population / India's population x 100

Highest Uttar Pradesh (about 16.5 per cent); lowest Sikkim.

Density extremes (2011)

Bihar 1,106 (highest state); Arunachal Pradesh 17 (lowest)

UTs: Delhi 11,320; Andaman and Nicobar 46.

Density classes

High above 500; moderate 250-500; low below 250

Persons per sq km, Census 2011.

How the board asks National and State Level Patterns of Population Distribution

The question patterns to expect, and the method that works for each.

Tricks to remember National and State Level Patterns of Population Distribution

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

• Factors 'L-C-A-D'

  Landforms, Climate, Accessibility, Development: the four the syllabus names.

  Use it when: Any 'factors' question.

• Bihar 1106, Arunachal 17

  Bihar is 'eleven-oh-six'; Arunachal is 'seventeen', the age of a Class 12 student.

  Use it when: Density extremes.

• Big Five

  UP-MB-WA: Uttar Pradesh, Maharashtra, Bihar, West Bengal, Andhra Pradesh hold almost half of India.

  Use it when: Concentration.

National and State Level Patterns of Population Distribution: board-level solved questions

Ordered from board level to HOTS. Cover the solution, write your own, then compare step by step.

Case-study practice (Section D style)

Read the situation, then answer every part. In the board paper this is a 7-mark question split into 2 + 2 + 2 + 1 marks.

Where the marks are

How a typical answer is split into step marks. Show every step: a right final answer alone rarely earns full marks.

Where students lose marks in National and State Level Patterns of Population Distribution

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

• ✗Mistake: Confusing the highest index of concentration with the highest density

  Uttar Pradesh has the largest share of people; Bihar has the most people per sq km. Students give Bihar for both.

  Wrong working

  Highest index of concentration: Bihar.

  Right working

  Highest index of concentration: Uttar Pradesh. Highest density: Bihar.

  ✓Do this: Concentration = share of India's people; density = people per sq km.

  Usually costs: 1 mark on the map question.

• ✗Mistake: Identifying the wrong state on the outline map

  CISCE examiners' comments, 2024, on the map question: some candidates 'Identified Kerala as Tamil Nadu', and teachers were advised to 'Teach students to mark, label and, identify state boundaries correctly'. Population items on the map list are state identifications.

  ✓Do this: Practise state outlines on a blank map, especially neighbouring pairs (Kerala-Tamil Nadu, Bihar-Jharkhand, Uttar Pradesh-Uttarakhand).

  Usually costs: 1 mark per item.

• ✗Mistake: Defining physiological density with total area

  It is then the same as arithmetic density.

  Wrong working

  Physiological density = population per sq km of land.

  Right working

  Physiological density = population per sq km of net cultivated land.

  ✓Do this: Always say 'net cultivated' or 'net sown' area.

  Usually costs: 1 mark.

• ✗Mistake: Listing factors without an Indian example

  A bare word such as 'climate' does not show how the factor works in India.

  ✓Do this: Factor + how it works + example: 'Arid climate limits farming, so western Rajasthan is sparse.'

  Usually costs: Half to one mark per point.

• ✗Mistake: Giving density figures from the wrong census or without units

  Figures must be 'as per the latest census' (2011) and in persons per sq km.

  ✓Do this: Write 'Bihar: 1,106 persons per sq km (2011)'.

  Usually costs: Up to 1 mark.

Practice questions on National and State Level Patterns of Population Distribution

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

1. Q1 · 1 mark · Very short answerBoard level

   Which state had the highest population density in India in 2011?

   Hint

   Over 1,100 per sq km.

   Answer

   Bihar (1,106 per sq km).

2. Q2 · 1 mark · Very short answerBoard level

   Which state had the lowest population density in 2011?

   Hint

   North-eastern frontier state.

   Answer

   Arunachal Pradesh (17 per sq km).

3. Q3 · 1 mark · Very short answerBoard level

   Define physiological density.

   Hint

   Divide by cultivated land.

   Answer

   The number of persons per unit of net cultivated (net sown) area.

4. Q4 · 1 mark · Very short answerHarder board level

   Rajasthan has the largest area among Indian states but not the largest population. Which statistic expresses this, and how?

   Hint

   Compare shares.

   Answer

   The index of concentration: Rajasthan holds about 10.4 per cent of India's area but only about 5.7 per cent of its population.

5. Q5 · 2 marks · Short answerHarder board level

   [2] Why do the Kashmir valley and the Imphal valley have much higher densities than the mountains around them?

   Hint

   Flat land in mountains.

   Answer

   They are flat, fertile basins with water and moderate climate, allowing farming, towns and transport, while the surrounding slopes are steep, forested and cold.

6. Q6 · 4 marks · Short answerHarder board level

   [4] Explain how the level of economic development influences population distribution in India, with examples.

   Hint

   Industry, cities, irrigation, mining.

   Answer

   (1) Industrial regions such as Mumbai-Pune and the Hooghly belt offer jobs and draw migrants. (2) Large cities and capitals such as Delhi have very high densities because of services and administration. (3) Irrigation in Punjab and Haryana supports dense farming populations. (4) Mining and heavy industry in Chota Nagpur created towns such as Dhanbad and Jamshedpur.

7. Q7 · 4 marks · Short answerHOTS / competency

   [4] 'Delhi's density is over 600 times that of Arunachal Pradesh.' Explain the reasons for this contrast.

   Hint

   11,320 versus 17.

   Answer

   Delhi (11,320 per sq km) is a small, almost wholly urban capital territory on the flat Ganga-Yamuna plain with jobs in government, trade, industry and services, and excellent transport, so migrants pour in. Arunachal Pradesh (17) is a large, mountainous, densely forested frontier state with heavy rain, little flat land, few industries and poor accessibility.

8. Q8 · 7 marks · Long answerHOTS / competency

   [7] (a) Distinguish between arithmetic and physiological density. [2]
   (b) Compare the densities of West Bengal and Madhya Pradesh and explain the difference. [5]

   Hint

   About 1,028 against 236.

   Answer

   (a) Arithmetic density is population per sq km of total area; physiological density is population per sq km of net cultivated area. (b) West Bengal had about 1,028 persons per sq km in 2011 against Madhya Pradesh's 236. West Bengal is mostly a flat, fertile deltaic plain with heavy monsoon rain, growing two or three rice crops a year; Kolkata and the Hooghly industrial belt add jobs; it has good river, rail and port access; and it received large refugee inflows after Partition. Madhya Pradesh is a large plateau with forests, uneven relief and poorer soils in parts, less irrigation and fewer large industrial regions, so its population is more thinly spread.

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. 1.India's arithmetic density in 2011?Show answer

   382 persons per sq km.

2. 2.State with the highest index of concentration?Show answer

   Uttar Pradesh (about 16.5 per cent of India's population).

3. 3.State with the lowest index of concentration?Show answer

   Sikkim.

4. 4.Densest Union Territory in 2011?Show answer

   NCT of Delhi (11,320 per sq km).

5. 5.Four factors named in the syllabus?Show answer

   Landforms, climate, accessibility and level of development.

Quick revision checklist

The night before the exam: can you do each of these without looking?

• ☐Census: official count at a fixed date; latest with results 2011.
• ☐Index of concentration: Uttar Pradesh highest (about 16.5 per cent), Sikkim lowest.
• ☐Arithmetic density = population / total area; India 382 (2011).
• ☐Physiological density = population / net cultivated area; much higher.
• ☐Highest density state Bihar 1,106; lowest Arunachal Pradesh 17; Delhi 11,320 (UT).
• ☐High: Ganga plain, Kerala, Punjab-Haryana. Low: deserts, Himalaya, north-east hills.
• ☐Factors: landforms, climate, accessibility, level of development (L-C-A-D).

National and State Level Patterns of Population Distribution: frequently asked questions