Urban and rural areas; population density
If 30 guests come to your home it feels crowded. Cities likewise pack more people into less space.
Population density = total population ÷ area (sq km); the number of people per square kilometre.
Key idea 1: City and village — Urban areas have concentrations of people, diverse businesses, government institutions, transport and communication, with elected local bodies responsible for development. Rural areas are villages with fewer people, close-knit communities, more agriculture, fewer businesses and gram panchayat governance. Definitions differ: a place becomes urban at over 220 people in Denmark, 50,000 in Japan and 5,000 in India.
- Easy: In India a place counts as urban above 5,000 people.
- Medium: Density is measured in people per sq km.
- Exam-type: Why is density higher in cities? — More people and buildings in less area.
In the figure: The definition of urban and rural varies by country.
Key idea 2: Density and big cities — Cities are densely built, so density is high; villages have more open land, so density is low. Among the world’s most populous cities in 2025 two are in India: Kolkata and New Delhi.
Density = population ÷ area.
Thinking a city is only tall buildings. It means diverse jobs, institutions and local bodies.
India 5,000; Japan 50,000; Denmark 220. Memory clue: Density = people ÷ space.
Spot the difference
| Point | Urban | Rural |
|---|---|---|
| Population/density | High | Low |
| Occupations | Diverse | Mostly agriculture |
| Governance | Elected urban local bodies | Gram panchayat |
Practice questions
- 1How is density calculated?
- 2Who governs rural areas?
- 3How many people make a place urban in Japan?
- 4Two of the world’s most populous cities in India?
- 5Name a feature of cities.
- 6Why is density low in villages?
- 7Why do definitions differ by country?
- 8What does a satellite pair (village vs city) show?
Show answers (try them yourself first)
- 1Total population ÷ area in sq km.
- 2Gram panchayat.
- 350,000.
- 4Kolkata and New Delhi.
- 5Diverse jobs, government institutions, extensive transport.
- 6More open land and fewer people.
- 7Each country sets its own population threshold.
- 8The village has open green land; the city is densely built; density is higher in the city.
How cities become economic hubs: urbanisation
Why do people move from villages to cities? Cities have factories, offices, schools and many kinds of work.
Urbanisation is the shift of population from rural to urban areas and the rise in the urban share.
Key idea 1: Why urbanisation happens — Places near rivers, at trade-route crossroads or near raw materials grew into economic and administrative centres. By 2050 the UN estimates 68 per cent of the world will live in cities (55 per cent now). India’s urban share rose from 17 per cent in 1951 to about 40 per cent in 2025. Farm villages → small towns with industry and services → large metropolises: diverse jobs attract people.
- Easy: India’s urban share was 17 per cent in 1951.
- Medium: Jamshedpur was earlier Sakchi.
- Exam-type: Why is Bengaluru an IT hub? — Software firms, start-ups and institutions.
In the figure: India’s urban share keeps rising.
Key idea 2: Examples — Jamshedpur: Sakchi village near iron ore; Asia’s first steel plant; named Jamshedpur in 1919; Jharkhand’s largest industrial city. Mumbai: a port on the Arabian Sea; Bombay Stock Exchange in 1875; film industry from the 1910s. Bengaluru: India’s Silicon Valley through IT firms, start-ups and institutions. Moradabad brass, Ludhiana–Tirupur textiles, Channapatna wooden toys, Kanchipuram silk saris. Agra, Amritsar and Varanasi thrive on tourism and pilgrims. Delhi’s NCR includes Noida and Ghaziabad; Gurugram has been an IT–BPO hub since the 1990s.
Location, resources and opportunity decide a city’s growth.
Thinking all cities grow for one reason. Each has its own: port, industry, tourism, IT.
17 % (1951) → 40 % (2025). Memory clue: Seventeen to forty.
Spot the difference
| City | Reason | Known for |
|---|---|---|
| Jamshedpur | Near iron ore | Steel |
| Mumbai | Port, stock exchange | Financial capital, films |
| Bengaluru | IT, institutions | Silicon Valley of India |
| Varanasi, Amritsar | Pilgrimage | Tourism |
Practice questions
- 1What is urbanisation?
- 2What share of the world will be urban by 2050?
- 3When was Jamshedpur named?
- 4When was the Bombay Stock Exchange set up?
- 5Why did Mumbai become a financial hub?
- 6Which cities are in the NCR?
- 7Two specialised towns and their products?
- 8Why do companies set up in smaller cities?
Show answers (try them yourself first)
- 1Shift of population from rural to urban and a rising urban share.
- 268 per cent (55 now).
- 31919.
- 41875.
- 5Port, BSE in 1875, trade and a gathering of talent.
- 6Noida and Ghaziabad (with Delhi; Gurugram is also an IT hub).
- 7Moradabad brass; Channapatna wooden toys.
- 8Costs are lower yet they can serve customers across India.
Cities as cultural hubs
Ever had Mumbai’s vada pav? Two cultures meet to make a new dish; cities do this.
A cultural hub is a city where people from different regions share languages, food, festivals and traditions.
Key idea 1: A blending — Cities blend languages, customs, food and festivals. Vada pav: a Maharashtrian potato dumpling in a pav (bread and potato are from the Portuguese); it became popular with Mumbai’s textile mill workers. Kolkata has colonial-era institutions like the Indian Museum and Victoria Memorial, and its Durga Puja was inscribed on UNESCO’s Intangible Cultural Heritage list in 2021.
- Easy: Kolkata’s Durga Puja was on UNESCO’s list in 2021.
- Medium: Vada pav is popular with Mumbai workers.
- Exam-type: Why do cities blend cultures? — People from many regions live together.
In the figure: Culture shows in festivals, dishes and museums.
Key idea 2: Facilities — Cities build cultural centres, libraries, museums and stadiums that become places of exchange and relationships, e.g. the Pradhanmantri Sangrahalay in New Delhi.
Cities exchange cultures.
Thinking a city is only business. Cultural life matters too.
Vada + pav = Maharashtrian + Portuguese. Memory clue: Durga Puja = Kolkata = 2021.
Spot the difference
| City | Cultural identity | Example |
|---|---|---|
| Mumbai | Blended food culture | Vada pav |
| Kolkata | Festival and heritage | Durga Puja (UNESCO 2021) |
| New Delhi | National institutions | PM Sangrahalay |
Practice questions
- 1Which workers popularised vada pav?
- 2Where did pav and potato come from?
- 3When was Kolkata’s Durga Puja inscribed?
- 4Two colonial institutions in Kolkata?
- 5What facilities do cities offer?
- 6How do people gain from this?
- 7Name a special tradition of a city near you.
- 8What is a cultural blend? Give an example.
Show answers (try them yourself first)
- 1Textile mill workers of Mumbai.
- 2From the Portuguese.
- 32021.
- 4Indian Museum and Victoria Memorial.
- 5Libraries, museums, stadiums, cultural centres.
- 6New experiences, relationships and networks.
- 7Your own example (e.g. a festival or fair).
- 8A new thing from two traditions; e.g. vada pav.
Challenges faced by cities
Morning traffic jams, waterlogging in rain, summer water shortage: these are everyday city experiences.
A slum is an overcrowded urban settlement with poor housing and limited water and sanitation; the AQI is a number reporting air quality.
Key idea 1: Main problems — The influx strains food, water, energy and housing: narrow roads, unplanned settlements, crowded vehicles, urban heat islands, pollution and waste. The NCR often records AQI above 400 against a safe limit of 50. Crowding and inequality raise crime. Slums grow on the outskirts and near railway tracks due to a lack of affordable housing; slum dwellers support the city through vegetable vending, domestic work and construction. The Pradhan Mantri Awas Yojana aims to give affordable housing.
- Easy: The NCR’s AQI often exceeds 400.
- Medium: Bengaluru’s lakes fell from about 1,000 to about 200.
- Exam-type: Benefit of collective action? — Lakes revived and more water.
In the figure: Crowding strains air, water and housing.
Key idea 2: Reviving Bengaluru’s lakes — Bengaluru faces water shortages in summer and floods in monsoon because of overuse of groundwater, no rainwater harvesting and encroachment on lakes. It once had about 1,000 lakes; now about 200. Bellandur and Varthur got covered in foam, released toxic gases and even caught fire. NGOs, resident associations and communities revive lakes by desilting, repairing bunds, planting native species and restocking fish.
Collective action can solve urban problems.
Thinking slum dwellers do not help the city. They provide many services.
AQI 50 safe; 400+ severe. Memory clue: Bengaluru lakes: thousand → two hundred.
Spot the difference
| Problem | Cause | Remedy |
|---|---|---|
| Pollution | Vehicles, industry | Control, public transport |
| Shortage/floods | Lake encroachment, groundwater overuse | Lake revival, harvesting |
| Slums | Few affordable homes | PM Awas Yojana |
Practice questions
- 1What is AQI?
- 2Safe AQI limit?
- 3Where do slums grow?
- 4Aim of PM Awas Yojana?
- 5How far did Bengaluru’s lakes decline?
- 6Two ways to revive lakes?
- 7Why more crime in cities?
- 8Write causes and remedies of one urban problem.
Show answers (try them yourself first)
- 1An air quality index; higher means more pollution.
- 250.
- 3On the periphery, near railway tracks and industrial areas.
- 4Affordable housing for the economically weaker.
- 5From about 1,000 to about 200.
- 6Desilting, planting native species, etc.
- 7Density and economic inequality.
- 8E.g. water shortage: overuse and encroachment; remedies harvesting and lake revival.
Planning cities: Jaipur and Singapore
A school is planned in advance, so classrooms, field and library are convenient. Cities need plans too.
An urban planner plans and designs how land and infrastructure in cities and towns are used.
Key idea 1: Jaipur: the ‘Pink City’ — In 1727 Maharaja Sawai Jai Singh II appointed Vidyadhar Bhattacharya to design a new city. Based on vastu and shilpa shastra, it has a grid of rectangular blocks (chowkris), aligned to the cardinal directions, with wide streets, gardens and 9 public squares. For security a 20-foot wall with 7 gates enclosed it. Buildings on main streets used pink sandstone, hence the ‘Pink City’. It provided sunlight, fresh air and water via reservoirs and canals; markets had shaded porches.
- Easy: Jaipur was designed in 1727.
- Medium: Singapore’s Master Plan is updated every 5 years.
- Exam-type: Why ‘Pink City’? — Buildings of pink sandstone.
In the figure: Good planning keeps a city useful for long.
Key idea 2: Singapore and Indian projects — Singapore, a small island nation, has over 8,000 people per sq km. It has a Concept Plan looking up to 40 years ahead and a Master Plan updated every 5 years; mixed-use spaces; connected rail, bus and cycle routes; rooftop and vertical gardens; a ‘garden city’. Indian examples: Ahmedabad’s Sabarmati Riverfront (promenades, parks, the Atal Bridge) and Gangtok’s Mahatma Gandhi Road, a pedestrian-only zone.
Planning must consider people, jobs, transport, safety and greenery.
Thinking Jaipur was unplanned. It still works on its 1727 design.
Jaipur 1727, 9 squares, 7 gates. Memory clue: Nine squares, seven gates.
Spot the difference
| Point | Jaipur | Singapore |
|---|---|---|
| Design | Grid, chowkris | Mixed-use, garden city |
| Planning | 1727 plan | 40-year and 5-year plans |
| Transport/environment | Wide streets, shade | MRT, cycling paths, vertical gardens |
Practice questions
- 1Who was Jaipur’s chief planner?
- 2Who founded Jaipur?
- 3Why is Jaipur called the Pink City?
- 4How many squares and gates?
- 5For how many years is the Concept Plan?
- 6Why is Singapore a ‘garden city’?
- 7Two Indian redevelopment projects?
- 8What questions must a good plan ask?
Show answers (try them yourself first)
- 1Vidyadhar Bhattacharya.
- 2Maharaja Sawai Jai Singh II.
- 3Because of pink sandstone buildings.
- 49 squares and 7 gates.
- 5Up to 40 years.
- 6Rooftop and vertical gardens, parks and green corridors.
- 7Sabarmati Riverfront and Gangtok’s M.G. Road.
- 8How many people, what jobs, what transport, where homes, parks and facilities go, and what safety is needed.