UPSC Mains 2026 Geography Optional Question Papers with Model Answers

All 55 questions of the 2026 Civil Services Main Examination, Geography Paper I and Geography Paper II, with marks and a suggested time per part. Solve each part on paper first, then open the model answer, or send it to answer-writing practice for evaluation.

UPSC Mains 2026 Geography Paper I

Question 1 (50 marks)

Q1(a) · Geomorphic Processes and Landscape Development · 10 marks≈ 7 min
Channel Morphology and Fluvial Landforms
What is 'Helical' flow? How Helical flow accounts for meander modifications?
हिंदी में प्रश्न
'हेलीकल' प्रवाह क्या है? हेलिकल प्रवाह किस प्रकार विसर्प परिमार्जन के लिए उत्तरदायी है?
Practise this question Geomorphic Processes and Landscape Development notes
Model answer
Paper and question: Paper I, Q1(a)
Approach: Define helical flow and explain its cause in a bend, then show how it erodes the outer bank, builds point bars and drives meander growth, migration and cut-off, with examples; draw a meander plan with a cross-section showing the spiral cell.
Helical flow is the corkscrew-like motion of water in a channel bend, in which a secondary cross-channel circulation is superimposed on the main downstream flow; James Thomson described it in river bends in 1876.
Cause: as water rounds a bend, centrifugal force piles surface water against the outer bank, raising the water surface there (superelevation). The resulting pressure gradient drives slower near-bed water towards the inner bank.
Meander modification: (i) the downwelling current scours the outer, concave bank, forming a deep pool and a steep cut bank; (ii) the bed current carries sediment to the inner bank, building a point bar and slip-off slope; (iii) erosion outside and deposition inside make the bend grow in amplitude and migrate laterally and downstream; (iv) as loops tighten, necks are breached, leaving oxbow lakes.
Diagram: Meander plan with thalweg, pools, riffles and point bars, and a cross-section at the bend showing the spiral cell, superelevated water surface, cut bank and point bar.
The meanders and oxbows of the Ganga in Bihar and the lower Mississippi illustrate this. Helical flow is therefore the hydraulic engine of meander evolution.
Q1(b) · Climatology: Atmosphere and Circulation · 10 marks≈ 7 min
Monsoons and Jet Streams
Define 'pseudo monsoon' and explain its spatial distribution.
हिंदी में प्रश्न
'सूडो मानसून' को परिभाषित कीजिए तथा इसके स्थानीय वितरण का वर्णन कीजिए।
Practise this question Climatology: Atmosphere and Circulation notes
Model answer
Paper and question: Paper I, Q1(b)
Approach: Define a true monsoon with Ramage's criteria, then define pseudo monsoon as a monsoon-like seasonal wind shift that fails these criteria, and explain its spatial distribution with commonly cited regions, noting that the boundary is debated. Draw a world sketch map contrasting true and pseudo monsoon areas.
A true monsoon is a large-scale seasonal reversal of winds. C.S. Ramage (Monsoon Meteorology, 1971) defined monsoon regions as those where the prevailing wind shifts by at least 120° between January and July and the prevailing winds are persistent and fairly strong.
A pseudo monsoon is a monsoon-like seasonal change of wind and rainfall that does not meet these criteria. The wind shift is smaller or less regular, the circulation is shallow and regional, and it is driven by local thermal lows rather than by the migration of the ITCZ across a large continent.
Spatial distribution: commonly cited examples are: (i) the south-eastern USA around the Gulf of Mexico; (ii) the south-western USA and north-western Mexico, whose summer rains are called the North American monsoon, although some meteorologists class them as a weak true monsoon; (iii) the Iberian Peninsula, where a summer thermal low draws winds inward.
Map: World outline shading the true monsoon lands (South and South-East Asia, West Africa, northern Australia) and marking the pseudo monsoon areas listed above.
The classification is debated, but the concept underlines the unique scale of the South Asian monsoon.
Q1(c) · Oceanography · 10 marks≈ 7 min
Ocean Bottom Topography and Ocean Deposits
How are seamounts and Guyots the same and different? Comment.
हिंदी में प्रश्न
अन्तःसमुद्री पर्वत एवं जुयोट्स किस प्रकार समान तथा किस प्रकार भिन्न हैं? टिप्पणी कीजिए।
Practise this question Oceanography notes
Model answer
Paper and question: Paper I, Q1(c)
Approach: The question asks for both similarities and differences, so define both features, list what they share, contrast their form and history, and end with a short comment; draw a profile of a seamount and a guyot.
A seamount is an isolated submarine mountain, usually a volcano, rising 1,000 m or more above the deep-sea floor without reaching the surface. A guyot is a flat-topped seamount, named by Harry Hess in 1946 after Arnold Guyot.
Same: both are volcanic, built at mid-ocean ridges or over hotspots; both stand on the abyssal floor below sea level; both occur in chains, most numerously in the Pacific, as in the Hawaiian–Emperor chain.
Different: a seamount has a conical summit, while a guyot has a planed, flat top, often with rounded gravel and fossil shallow-water corals. A guyot once reached sea level, where waves eroded its top; it then sank as the cooling plate moved away from the ridge, so its top now lies about 1,000–2,000 m deep. A seamount never reached the surface.
Diagram: Profile showing a conical seamount below sea level and a flat-topped guyot farther from a ridge, with an arrow marking plate movement and subsidence.
Comment: a guyot is thus an older, drowned stage of a seamount. Its flat top, far below wave base, is strong evidence for sea-floor spreading and thermal subsidence of oceanic lithosphere.
Q1(d) · Biogeography · 10 marks≈ 7 min
Soil Genesis, Profile, Classification and Distribution
How a 'Solum' as a concept different from 'Pedon'? Describe.
हिंदी में प्रश्न
'सोलम' एक संकल्पना के रूप में किस प्रकार 'पेडॉन' से भिन्न है? वर्णन कीजिए।
Practise this question Biogeography notes
Model answer
Paper and question: Paper I, Q1(d)
Approach: Define pedon and solum with their source, then contrast them by dimension, horizons included and use; draw a soil profile marking the solum within a pedon.
Soil is studied through units of different scale. The pedon is a three-dimensional unit of soil, while the solum is the genetically developed upper part of its profile.
Pedon: the smallest volume of soil, about 1 to 10 m² in surface area, that shows the full set of horizons and properties of a soil. The USDA Soil Taxonomy uses it as the basic unit of description and sampling, and contiguous similar pedons form a polypedon, the unit shown on soil maps.
Solum: the A, E and B horizons, where humification, eluviation and illuviation are active. It excludes the parent material (C) and bedrock (R), and its depth shows soil maturity: deep in old tropical laterites, thin in young hill soils of the Himalaya.
Diagram: A block of soil (pedon) with its front face showing O, A, E, B, C and R horizons; a bracket marks A to B as the solum and the whole block as the pedon, with neighbouring blocks labelled polypedon.
They differ in dimension (solum is a vertical section, pedon a volume), content (a pedon may include the C horizon) and purpose (pedon for classification and mapping, solum for judging soil development and the root zone).
Q1(e) · Environmental Geography · 10 marks≈ 7 min
Environmental Hazards, Policy, Education and Legislation
With suitable examples describe the hazards of flood plain settlement.
हिंदी में प्रश्न
उचित उदाहरणों द्वारा बाढ़-मैदान अधिवास के खतरों का वर्णन कीजिए।
Practise this question Environmental Geography notes
Model answer
Paper and question: Paper I, Q1(e)
Approach: Explain why people settle on floodplains, then describe the hazards (inundation, channel shifting and breaches, bank erosion, disease) with Indian and world examples, and end with floodplain zoning; draw a map of India marking the flood events cited.
A floodplain is the flat land beside a river built by its own deposits and periodically inundated. Fertile soil, water and level land attract dense settlement, but occupying it means recurrent hazard; Gilbert White argued that floods are natural while flood losses are largely the result of human occupance.
Inundation and loss of life and property: the Jhelum flood in Srinagar (2014), the Chennai floods (2015) on encroached floodplains and lake beds, and the Yamuna flood in Delhi (July 2023).
Channel shifting and breaches: the Kosi breached its embankment at Kusaha in Nepal (2008) and flooded north Bihar. Embankments give a false sense of safety, the levee effect, that draws more settlement into danger.
Bank erosion and disease: Brahmaputra erosion has shrunk Majuli island, and stagnant water spreads cholera, leptospirosis and malaria. Abroad, the Mississippi (1993) and Indus (2010, 2022) floods show the same pattern.
Map: Outline map of India marking the Jhelum at Srinagar, the Yamuna at Delhi, the Kosi in north Bihar with Kusaha, the Brahmaputra with Majuli, and Chennai.
The answer lies in floodplain zoning, early warning, raised houses and giving the river room rather than building ever-higher embankments.

Question 2 (50 marks)

Q2(a) · Geomorphic Processes and Landscape Development · 20 marks≈ 14 min
Applied Geomorphology: Geohydrology, Economic Geology and Environment
"Environmental geomorphology deals with the impact of natural landforms and processes." Elucidate with suitable examples.
हिंदी में प्रश्न
"पर्यावरणीय भूआकृति विज्ञान प्राकृतिक स्थलरूपों और प्रक्रियाओं के प्रभाव से सम्बन्धित है।" उपयुक्त उदाहरणों सहित स्पष्ट कीजिए।
Practise this question Geomorphic Processes and Landscape Development notes
Model answer
Paper and question: Paper I, Q2(a)
Approach: Define environmental geomorphology (Coates), elucidate the impact of landforms and processes on people through hazards, resources and site constraints with Indian and world examples, add the reverse human impact, and conclude with applications; draw a hazard-zonation or floodplain land-use sketch.
Environmental geomorphology is the practical use of geomorphology to understand how landforms and surface processes affect human life and activities, and how people in turn modify them. D.R. Coates, who edited Environmental Geomorphology (1971), helped establish it as a field.
Landforms and processes as hazards: active processes become hazards where people live. Landslides and debris flows on steep Himalayan slopes (Kedarnath, 2013; Joshimath subsidence, 2023); river floods and avulsion on the Kosi fan (2008); coastal erosion and cyclone surges on the low Odisha and Bengal coasts; earthquakes along the Himalayan thrusts; and glacial lake outbursts such as South Lhonak in Sikkim (2023).
Landforms as resources: alluvial plains provide fertile soil and aquifers — the Indo-Gangetic plain supports dense population; deltas give rice lands and fisheries; laterite plateaus hold bauxite; river beds supply sand and gravel; karst holds springs and caves for tourism.
Landforms as site constraints: slope, drainage and stability decide the siting of dams (Tehri), tunnels, highways, ports and cities; Mumbai’s reclaimed land and Kolkata on subsiding deltaic ground show the geomorphic risks of urban growth.
Diagram: Cross-section of a river valley from hillslope to floodplain marked with landslide zone, active channel, flood-prone zone and safe terrace for settlement.
The reverse link: human activity is now a major geomorphic agent — sand mining lowers river beds, dams starve deltas of sediment, urban encroachment on floodplains worsened the Chennai floods of 2015, and the shrinking Aral Sea shows large-scale change.
Applications: hazard zonation, environmental impact assessment, floodplain zoning, coastal regulation and land-capability planning all rest on environmental geomorphology. The statement captures its core, but the discipline equally studies human impact, aiming at development in harmony with surface processes.
Q2(b) · Oceanography · 15 marks≈ 11 min
Waves, Currents and Tides
Discuss the potential consequences of the collapse of the Atlantic Meridional Overturning Circulation (AMOC) for the world.
हिंदी में प्रश्न
विश्व के लिए अतलांटिक मेरिडियोनल ओवरटर्निंग सरकुलेशन (AMOC) के पतन के संभावित परिणामों पर चर्चा कीजिए।
Practise this question Oceanography notes
Model answer
Paper and question: Paper I, Q2(b)
Approach: Explain what the AMOC is and why it may collapse, then discuss its global consequences region by region (Europe, tropics and monsoons, sea level, carbon and ecosystems), noting scientific uncertainty; draw a sketch of the AMOC conveyor in the Atlantic.
The Atlantic Meridional Overturning Circulation (AMOC) is the Atlantic limb of the thermohaline circulation: warm, salty surface water (Gulf Stream, North Atlantic Drift) flows north, cools and sinks in the Labrador and Nordic seas as North Atlantic Deep Water, and returns south at depth. Melting Greenland ice and greater rainfall freshen the surface, reducing sinking. IPCC AR6 (2021) judges a decline very likely this century but has medium confidence that an abrupt collapse will not occur before 2100; some recent studies suggest an earlier tipping point, a debated view.
Europe and the North Atlantic: loss of northward heat would sharply cool north-west Europe, with harsher winters, more storms and stress on farming, even as the rest of the world warms.
Tropics and monsoons: the ITCZ would shift south, weakening the West African and Indian monsoons, drying the Sahel and disturbing rainfall over the Amazon; this threatens food security in South Asia.
Sea level: the slackening of the Gulf Stream would raise sea level along the US east coast by redistributing water.
Carbon and ecosystems: less deep-water formation would reduce ocean uptake of carbon dioxide and oxygen, and cut nutrient supply, hurting North Atlantic fisheries and plankton.
Diagram: Atlantic sketch showing the warm surface flow northward, sinking zones near Greenland and the Labrador Sea, and the cold deep return flow southward.
An AMOC collapse would thus be a global tipping point with cascading effects, which makes rapid emission cuts and better ocean monitoring, such as the RAPID array at 26° N, essential.
Q2(c) · Environmental Geography · 15 marks≈ 11 min
Biodiversity and Sustainable Development
"Overgrazing has become an alarming situation of bioloss in many bio-geographical regions of the world." Illustrate with examples.
हिंदी में प्रश्न
"अत्यधिक चराई विश्व के अनेक जैव-भौगोलिक क्षेत्रों में जैव विविधता हानि की एक गंभीर स्थिति बन गई है।" सोदाहरण समझाइए।
Practise this question Environmental Geography notes
Model answer
Paper and question: Paper I, Q2(c)
Approach: Define overgrazing and explain how it leads to bioloss, then illustrate with examples from several bio-geographical regions (Sahel, Mongolian steppe, Patagonia and Australia, India) and end with remedies; draw a flow chart of the degradation chain.
Overgrazing occurs when livestock graze vegetation faster than it can regrow, so grazing pressure exceeds the carrying capacity of a pasture. It starts a chain of bioloss: plant cover, soil fauna, pollinators and dependent wild animals all decline.
Palatable perennial grasses decline first; unpalatable shrubs and invaders such as Prosopis juliflora spread; trampling compacts the soil and erosion strips the topsoil. In drylands the end stage is desertification.
Diagram: Flow chart: rising livestock numbers → grazing beyond carrying capacity → loss of perennial grasses → bare, compacted soil → erosion and lower infiltration → invasive shrubs and desertification → loss of wild fauna and pastoral income.
Sahel: herds built up in the wet 1950s and 1960s were left on bare, overstocked rangelands by the droughts of the 1970s and 1980s; the relative roles of grazing and rainfall are debated.
Mongolian steppe: goat numbers rose for cashmere after collective herding ended around 1990, degrading grasslands. Patagonia and Australia: sheep grazing since the 19th century has caused shrub encroachment and soil erosion.
India: Prosopis has overrun the Banni grassland of Kachchh; Thar grasslands sheltering the Great Indian Bustard are shrinking; alpine bugyals of Uttarakhand and Himachal Pradesh erode under heavy seasonal grazing.
Remedies include rotational grazing, fodder banks, stall-feeding, removal of invasive species and community pasture management such as Uttarakhand's Van Panchayats. Since pastoralists depend on these lands, conservation must also secure their livelihoods.

Question 3 (50 marks)

Q3(a) · Climatology: Atmosphere and Circulation · 20 marks≈ 14 min
Atmospheric Stability, Air Masses and Frontogenesis
Describe the general characteristics and structure of a thunderstorm and suggest suitable classification of thunderstorm.
हिंदी में प्रश्न
तड़ित झंझा की सामान्य विशेषताएं और संरचना का वर्णन कीजिए तथा तड़ित झंझा का उपयुक्त वर्गीकरण सुझाइए।
Practise this question Climatology: Atmosphere and Circulation notes
Model answer
Paper and question: Paper I, Q3(a)
Approach: Describe the general characteristics, then the structure (cloud, updraughts and downdraughts, charge layers) through the three-stage life cycle, and finally suggest a classification by origin and by organisation, with Indian and world examples. Draw a labelled cross-section of a mature thunderstorm cell.
A thunderstorm is a local storm produced by a cumulonimbus cloud and always accompanied by lightning and thunder. It forms when warm, moist air in a conditionally unstable atmosphere is lifted strongly enough to rise freely.
General characteristics: towering cumulonimbus reaching 10–15 km, often with an anvil spreading at the tropopause; heavy but short-lived rain; gusty squalls; hail; a sudden fall in temperature as the cold downdraught spreads out; and a life of usually less than an hour for a single cell.
Structure and life cycle (Byers and Braham, Thunderstorm Project, USA, late 1940s): (i) cumulus stage, with strong updraughts only and growing cloud; (ii) mature stage, when precipitation begins and drags air down, so updraughts and downdraughts coexist, with lightning, hail and gust fronts at their peak; (iii) dissipating stage, when downdraughts dominate, cut off the supply of warm air and the cloud decays. Electrically, the upper cloud is positively charged and the middle part negative, with a small positive area near the base.
Diagram: Cross-section of a mature cumulonimbus with anvil at the tropopause, updraught on one side, downdraught and rain shaft on the other, gust front at the surface, and + and − charge zones marked.
Classification by origin: (a) air-mass or convective thunderstorms from intense surface heating, as in the equatorial afternoon storms of the Congo basin and Kerala's pre-monsoon showers; (b) orographic storms where moist air is forced up slopes, as over the Western Ghats and the Himalayan foothills; (c) frontal storms along advancing cold fronts and squall lines in the mid-latitudes.
Classification by organisation: single-cell, multicell cluster, multicell line or squall line, and supercell storms with a rotating updraught that spawn tornadoes in the US Great Plains. The Norwesters (Kalbaisakhi) of West Bengal and Assam are organised squall-line storms.
A combined classification by origin and organisation therefore best explains thunderstorm behaviour.
Q3(b) · Environmental Geography · 15 marks≈ 11 min
Ecosystems, Ecological Imbalances and Environmental Degradation
Anthropogenic impacts have caused major global and regional changes and imbalances in ecosystem. Elucidate with examples.
हिंदी में प्रश्न
मानवजनित प्रभावों ने पारिस्थितिकी तंत्र में वैश्विक तथा क्षेत्रीय स्तर पर बड़े परिवर्तन और असंतुलन उत्पन्न किए हैं। उदाहरणों सहित स्पष्ट कीजिए।
Practise this question Environmental Geography notes
Model answer
Paper and question: Paper I, Q3(b)
Approach: Define ecological imbalance, then classify anthropogenic drivers and show their global and regional effects with named examples, ending with restoration responses. A world map of hotspots of change supports the answer.
An ecological imbalance arises when human pressure pushes an ecosystem beyond its capacity to absorb disturbance, so that its structure, energy flow and nutrient cycles change.
Global changes: burning of fossil fuels has raised atmospheric carbon dioxide above 420 ppm (NOAA, Mauna Loa, 2023), causing warming, glacier retreat and sea-level rise. Ocean warming and acidification caused mass bleaching of the Great Barrier Reef in 2016, 2017, 2020, 2022 and 2024. CFCs created the Antarctic ozone hole, now slowly healing after the Montreal Protocol (1987).
Regional changes: irrigation diversions from the Amu Darya and Syr Darya shrank the Aral Sea; Amazon clearance threatens a shift from rainforest to savanna; fertiliser runoff creates a hypoxic dead zone in the Gulf of Mexico.
Indian examples: mining and plantations fragment the Western Ghats; reduced freshwater flow and rising salinity stress the Sundarbans mangroves; unplanned construction contributed to land subsidence at Joshimath (2023); invasive species such as Lantana and Prosopis juliflora have replaced native grasslands in Banni (Kutch).
Map: World outline marking the Aral Sea, Amazon, Great Barrier Reef, Gulf of Mexico dead zone, Sahel, and in India the Western Ghats, Sundarbans, Joshimath and Banni.
Imbalances also travel: dust from the degraded Sahel reaches the Caribbean, and Himalayan deforestation raises sediment loads in the plains.
Recovery is possible, as Chilika lake showed after its mouth was reopened in 2000. Ecosystem-based management, protected areas and the UN Decade on Ecosystem Restoration (2021–2030) aim to restore balance.
Q3(c) · Geomorphic Processes and Landscape Development · 15 marks≈ 11 min
Applied Geomorphology: Geohydrology, Economic Geology and Environment
What is scarification? List out various impacts and examples of scarification on land.
हिंदी में प्रश्न
उत्कीर्णन क्या है? भूमि पर उत्कीर्णन के विभिन्न प्रभावों एवं उदाहरणों को सूचीबद्ध कीजिए।
Practise this question Geomorphic Processes and Landscape Development notes
Model answer
Paper and question: Paper I, Q3(c)
Approach: Define scarification as human scarring of the land surface (noting the narrower soil-loosening sense), list its forms, then its physical, hydrological, ecological and social impacts with Indian and world examples, and end with restoration; sketch a mined landscape profile.
In anthropogenic geomorphology, scarification refers to the scarring of the land surface by human excavation and disturbance — the removal of vegetation, soil and rock that leaves pits, cuts, trenches and spoil heaps. In soil science and forestry the term has a narrower sense: mechanically loosening or breaking the topsoil, for example to aid seed germination.
Forms: open-cast mine pits and quarries; spoil dumps and tailings; road and railway cuttings; sand and gravel pits in river beds; brick-kiln borrow pits; and ground cleared for construction.
Physical impacts: loss of topsoil, accelerated sheet and gully erosion, slope failure on cut faces and dumps, and land subsidence over underground workings, as in the Jharia coalfield, where mine fires also burn.
Hydrological impacts: altered drainage, lowered water tables near deep pits, siltation of streams, and acid mine drainage; riverbed sand mining lowers channel beds and undermines bridges.
Ecological and social impacts: habitat loss and fragmentation, dust and air pollution, loss of farmland and displacement. In India, iron-ore mining around Bellary (Karnataka) led to a Supreme Court ban in 2011, and illegal quarrying has scarred the Aravallis; worldwide, Bingham Canyon copper pit (USA) and the Alberta oil sands (Canada) are striking examples.
Diagram: Profile of a mined landscape showing an open pit, benches, spoil dump, subsided ground and a silted stream.
Reclamation — backfilling, terracing, topsoil replacement and afforestation, required under mine closure plans — can heal scars, but prevention through planning remains cheaper.

Question 4 (50 marks)

Q4(a) · Biogeography · 20 marks≈ 14 min
World Distribution of Plants and Animals; Gene Pool Centres
How does the annual variations in temperature and precipitation influence plants growth, development and distribution? How do animals cope up with variations in climate?
हिंदी में प्रश्न
तापमान और वर्षण में वार्षिक परिवर्तन पौधों की बृद्धि, विकास एवं वितरण को किस प्रकार प्रभावित करता है? जलवायु परिवर्तन में होने वाले विभिन्न परिवर्तनों का सामना जानवर किस प्रकार करते हैं?
Practise this question Biogeography notes
Model answer
Paper and question: Paper I, Q4(a)
Approach: First explain how annual temperature and precipitation regimes control plant growth, development (phenology) and distribution, then how animals cope through physiological, morphological and behavioural adaptations; draw Whittaker’s biome diagram.
Temperature and precipitation, and their variation through the year, are the main climatic controls of life. They set the length of the growing season, the timing of life cycles and the limits of each species’ range.
Temperature and plants: photosynthesis and growth run only within a range, roughly above 5 to 6 °C for most plants, so the growing season shortens poleward and upward. Winter cold triggers dormancy and leaf fall in temperate deciduous trees, and wheat needs vernalisation to flower. Frost limits mangroves and palms to warm coasts, and the treeline marks where summer warmth is too short for trees, near 3,500 to 4,000 m in the western Himalaya.
Precipitation and plants: the amount and season of rain decide whether forests are evergreen or deciduous. A long dry season makes sal and teak shed leaves in the Indian monsoon forests; desert ephemerals of the Thar complete their life cycle within weeks after rain; xerophytes store water or root deeply.
Distribution: Whittaker (1975) showed that biomes can be plotted by mean annual temperature and rainfall, and Holdridge’s life zones (1947) use temperature, rainfall and evapotranspiration in the same way.
Diagram: Whittaker’s biome diagram: mean annual temperature on the x-axis, annual precipitation on the y-axis, with tundra, taiga, temperate forest, grassland, desert, savanna and tropical rainforest as fields.
How animals cope: physiologically through hibernation (Himalayan brown bear, marmot) and aestivation (lungfish, desert snails); morphologically following Bergmann’s rule (larger bodies in colder climates) and Allen’s rule (shorter ears and limbs), with thick fur and fat as in the snow leopard and yak.
Behaviourally, animals migrate to follow food and rain: Amur falcons pass over Nagaland each autumn, cranes winter in Rajasthan, and wildebeest circle the Serengeti. Desert animals are nocturnal or burrow, and many breed to match the season of plenty.
As climate warms, these ranges and timings are shifting, a key concern for biodiversity.
Q4(b) · Climatology: Atmosphere and Circulation · 15 marks≈ 11 min
Atmospheric Stability, Air Masses and Frontogenesis
Examine the importance of axis of dilation of airmasses in frontogenesis and the origin of Temperate cyclones.
हिंदी में प्रश्न
वाताग्रजनन एवं शीतोष्ण कटिबन्धीय चक्रवातों के उत्पत्ति में वायुराशियों के अक्ष विस्फारण के महत्त्व का परीक्षण कीजिए।
Practise this question Climatology: Atmosphere and Circulation notes
Model answer
Paper and question: Paper I, Q4(b)
Approach: Explain the deformation field and its axis of dilatation, how it gathers isotherms into a front (Petterssen's frontogenesis condition), and then how the polar front formed along it gives rise to temperate cyclones through the wave stages of the Bergen school. Draw the deformation field with isotherms.
Frontogenesis is the formation or sharpening of a front, the boundary between contrasting air masses. A key kinematic cause is the deformation field, analysed by Sverre Petterssen (1936).
Axis of dilatation: where two air streams converge from opposite sides, as in a col between two highs and two lows, the flow has an axis of contraction, along which air comes in, and an axis of dilatation, along which it spreads out.
Role in frontogenesis: isotherms lying at an angle of less than 45° to the axis of dilatation are rotated towards it and crowded together, so the temperature gradient tightens and a front forms along the axis. If the angle exceeds 45°, isotherms are spread apart and frontolysis occurs.
Diagram: Hyperbolic deformation field with inflow arrows along the axis of contraction and outflow along the axis of dilatation; isotherms at first oblique, then packed along the dilatation axis to form a front.
Origin of temperate cyclones: along the polar front, cold polar air and warm tropical air meet. According to the polar front theory of the Bergen school (V. and J. Bjerknes, Solberg, around 1918–1922), a small wave forms on this front, warm air pushes poleward and cold air equatorward, creating warm and cold fronts around a low. The cyclone deepens, the cold front overtakes the warm front to form an occlusion, and the system dies.
Western disturbances reaching India originate in this way over the Mediterranean. The axis of dilatation is therefore the first step in the chain that gives mid-latitude weather.
Q4(c) · Environmental Geography · 15 marks≈ 11 min
Ecosystems, Ecological Imbalances and Environmental Degradation
Construction of large dams poses serious challenges. Describe the threats and solutions associated with it.
हिंदी में प्रश्न
बड़े बाँधों का निर्माण गंभीर चुनौतियाँ उत्पन्न करते हैं। इससे जुड़े खतरों और उनके समाधानों का वर्णन कीजिए।
Practise this question Environmental Geography notes
Model answer
Paper and question: Paper I, Q4(c)
Approach: Briefly state the benefits of large dams, then describe environmental, geological and social threats with Indian and world examples, followed by solutions (planning, technical, legal, social). A labelled sketch of a dam's upstream and downstream effects is useful.
Large dams (over 15 m high, as defined by ICOLD) store water for irrigation, hydropower, flood control and drinking water; Bhakra, Hirakud and Sardar Sarovar transformed Indian agriculture. Yet the World Commission on Dams (2000) found their costs often underestimated.
Ecological threats: reservoirs drown forests and wildlife habitat; dams block fish migration (the hilsa decline above Farakka); they trap sediment, so deltas starve and erode, as in the Nile delta after the Aswan High Dam. Stagnant reservoirs emit methane and may spread water-borne diseases.
Geological threats: reservoir-induced seismicity is linked to the Koyna earthquake of 1967; Tehri lies in a seismically active Himalayan zone; siltation shortens reservoir life. Dam failure is catastrophic: Machchhu (Morbi, 1979), and the Chungthang dam of Teesta III washed away in the South Lhonak lake outburst flood of October 2023.
Social threats: displacement of tribal and rural people with poor rehabilitation, as the Narmada Bachao Andolan highlighted; loss of livelihoods downstream; and interstate or international water disputes.
Diagram: River profile with a dam: upstream submergence, sediment deposition and displaced villages; downstream reduced flow, delta erosion, blocked fish passage and seismic risk.
Solutions: cumulative basin-level impact assessment and environmental flows; smaller or decentralised storage where suitable; fish ladders and sediment flushing; seismic design and early-warning systems; the Dam Safety Act, 2021 and the DRIP programme for old dams; fair rehabilitation with benefit sharing.
Dams remain necessary for water and energy security, but must be planned as part of the whole river ecosystem.

Question 5 (50 marks)

Q5(a) · Perspectives in Human Geography · 10 marks≈ 7 min
Areal Differentiation, Regional Synthesis, Dichotomy and Dualism
"Systematic Geography is essentially analytical and makes generic concepts and Universal Laws." Elucidate with examples.
हिंदी में प्रश्न
"क्रमबद्ध भूगोल मूलरूप से विश्लेषणात्मक होती है तथा सामान्य अवधारणाएं और सार्वभौमिक नियम बनाती है।" सोदाहरण स्पष्ट कीजिए।
Practise this question Perspectives in Human Geography notes
Model answer
Paper and question: Paper I, Q5(a)
Approach: Define systematic geography and contrast it with regional geography, then show with examples how it isolates one phenomenon, classifies it and builds generic concepts and laws; end with its limits.
Systematic geography, rooted in Bernhard Varenius's distinction (1650) between general and special geography and developed by Alexander von Humboldt, studies one element of the earth's surface (landforms, climate, population, industry) across the whole world. Its method is analytical: it breaks reality into components and searches for regularities.
Generic concepts arise when many cases are compared. Davis's cycle of erosion, Koppen's climatic types and the demographic transition model each generalise from hundreds of places. Settlement geography gives Christaller's central place theory; economic geography gives Weber's least-cost location.
Universal laws are sought in the nomothetic tradition defended by Fred Schaefer (1953) against Hartshorne's idiographic view. Examples are Zipf's rank-size rule, Ravenstein's laws of migration, Tobler's first law of geography and the gravity model of interaction, which apply equally to Indian and European cities.
Diagram: Two-column chart: systematic geography (one element, world-wide, analytical, nomothetic) versus regional geography (all elements, one area, synthetic, idiographic), with arrows showing both feed each other.
Yet laws in human geography are probabilistic, not exact like physics. Systematic and regional geography are complementary: generalisations from systematic study are tested and enriched in regional synthesis.
Q5(b) · Economic Geography · 10 marks≈ 7 min
World Agriculture: Typology, Inputs and Productivity
Critically examine the significance of five functioning forms with regard to agricultural regions of the world proposed by D. Whittlesey.
हिंदी में प्रश्न
डी. व्हिटल्सी द्वारा प्रतिपादित विश्व के कृषि प्रदेशों के संदर्भ में पाँच क्रियात्मक रूपों के महत्त्व का समालोचनात्मक परीक्षण कीजिए।
Practise this question Economic Geography notes
Model answer
Paper and question: Paper I, Q5(b)
Approach: State Whittlesey's five criteria (functioning forms), show briefly how each separates agricultural regions, and critically examine their significance and limitations.
Derwent Whittlesey, in 'Major Agricultural Regions of the Earth' (1936), classified world agriculture into 13 regions using five functioning forms of agriculture.
They are: (i) crop and livestock association; (ii) methods used to grow crops and raise stock, especially intensity of land use; (iii) intensity of application of labour, capital and organisation, and the output that results; (iv) disposal of products, whether consumed at home or sold (subsistence versus commercial); (v) the ensemble of dwellings and structures used to house and operate the farm.
Significance: by combining several criteria they captured agriculture as a system, giving meaningful types such as intensive subsistence rice cultivation in monsoon Asia, commercial plantations, Mediterranean agriculture and commercial dairying. The subsistence-commercial axis remains a basic tool of agricultural geography.
Map: World sketch of selected Whittlesey regions: nomadic herding in the Sahara and Central Asia, rice in monsoon Asia, commercial grain in the Prairies, dairying in north-west Europe.
Limitations: the criteria are qualitative and partly overlapping; buildings are a weak indicator today; and mechanisation, irrigation and globalisation have blurred boundaries. Still, they form the base of later classifications.
Q5(c) · Population Geography · 10 marks≈ 7 min
Migration: Causes and Consequences
"The majority of migrants go only a short distance." Explain with examples.
हिंदी में प्रश्न
"अधिकांश प्रवासी केवल कम दूरी तक ही जाते हैं।" उदाहरण सहित समझाइए।
Practise this question Population Geography notes
Model answer
Paper and question: Paper I, Q5(c)
Approach: Attribute the statement to Ravenstein's laws, explain why distance deters migration (cost, information, intervening opportunities), give Indian and world examples, and note exceptions.
The statement is the first of E.G. Ravenstein's laws of migration (1885, 1889), based on British census data: most migrants move only a short distance, and the volume of migration declines with distance, a pattern known as distance decay.
Reasons: longer moves cost more; information about distant places is weaker; social networks are local; and intervening opportunities (Stouffer, 1940) capture migrants before they travel far. Ravenstein also noted that migration proceeds step by step, from village to small town to city.
Examples: Census 2011 showed that most of India's internal migrants moved within the same district, largely women moving on marriage; seasonal labourers in Odisha move to nearby brick kilns before going to distant states; in Europe, most movement is within regions.
Diagram: Distance-decay graph: number of migrants on the vertical axis falling steeply with distance on the horizontal axis, with a step-migration sketch village → town → city.
Exceptions: long-distance flows from Bihar and Uttar Pradesh to Mumbai and Punjab, and to the Gulf, show that strong economic differentials and networks can override distance, a point Ravenstein recognised for large commercial centres.
Q5(d) · Environmental Geography · 10 marks≈ 7 min
Biodiversity and Sustainable Development
"Sustainable development requires Intergenerational and Intragenerational equity." Comment with examples.
हिंदी में प्रश्न
"सतत विकास के लिए अंतरपीढ़ीगत तथा अंतःपीढ़ीगत समानता आवश्यक है।" उदाहरण सहित टिप्पणी कीजिए।
Practise this question Environmental Geography notes
Model answer
Paper and question: Paper I, Q5(d)
Approach: Define sustainable development (Brundtland, 1987), explain intergenerational and intragenerational equity with Indian and global examples, show how the two are linked and conclude; a simple two-axis diagram of equity across time and society helps.
The Brundtland Report, Our Common Future (1987), defined sustainable development as meeting present needs without compromising the ability of future generations to meet theirs. Equity lies at its core, across time and across society.
Intergenerational equity is fairness between generations: each generation holds the Earth in trust and must pass on natural capital undiminished, a view developed by Edith Brown Weiss. Groundwater mining in Punjab and long-lived carbon emissions shift costs onto the future; India's Supreme Court invoked the principle when directing a permanent fund from Goa's iron-ore revenue (2014).
Intragenerational equity is fairness within the present generation, between nations, classes and regions. The UNFCCC (1992) principle of common but differentiated responsibilities, India's Forest Rights Act 2006 and District Mineral Foundations that share mining revenue with affected people apply it.
Diagram: Two axes from the centre labelled 'present generation' (rich ↔ poor, north ↔ south) and 'future generations' (time), with sustainable development where both are balanced.
The two are linked: poverty forces overuse of fuelwood and pastures today, robbing the future. Sustainable development is thus justice across both time and society.
Q5(e) · Models, Theories and Laws in Human Geography · 10 marks≈ 7 min
Von Thunen, Weber, Perroux-Boudeville and Rostow
"Under what situations Von Thunen's model of agricultural location is still rational." Justify with examples.
हिंदी में प्रश्न
"वॉन थ्यूनेन के कृषि अवस्थिति मॉडल की आज भी किन परिस्थितियों में तार्किक प्रासंगिकता बनी हुई है।" सोदाहरण स्पष्ट कीजिए।
Practise this question Models, Theories and Laws in Human Geography notes
Model answer
Paper and question: Paper I, Q5(e)
Approach: State Von Thunen's model and its logic of economic rent, then identify situations where it still works (perishables near cities, poor transport, uniform plains, global scale), with examples.
Johann Heinrich von Thunen, in Der isolierte Staat (1826), showed that on a uniform plain around a single market, land use is arranged in concentric rings according to economic rent, which falls with transport cost: perishable, bulky and intensive products near the city, extensive uses farther away.
Situations where it is still rational: (i) perishable produce: milk, vegetables and flowers are grown in peri-urban belts around Delhi, Mumbai and Kolkata, as in the dairy colonies and vegetable villages of the Yamuna floodplain; (ii) where transport is poor or costly, as in parts of sub-Saharan Africa and remote Indian tribal areas, where intensity falls sharply with distance from villages and markets, shown at village scale by Chisholm (1962); (iii) on uniform plains such as the Punjab-Haryana plain around mandi towns; (iv) at the global scale, Peet (1969) found a world von Thunen pattern, with intensive farming near the North Atlantic core and ranching on distant frontiers.
Diagram: Concentric rings around a city: market gardening and dairying, forestry, intensive arable, extensive arable, ranching, with a bid-rent graph for each.
Where transport cost and perishability still matter, the model's logic remains valid.

Question 6 (50 marks)

Q6(a) · Settlement Geography · 20 marks≈ 14 min
Urban Morphology and Functional Classification of Towns
Discuss the Geometry of Land Values in Urban Community and delimiting the Central Business District (CBD) in detail.
हिंदी में प्रश्न
शहरी समुदाय में कृषि मूल्यों की ज्यामिति और केन्द्रीय व्यापार क्षेत्र (CBD) के सीमांकन प्रक्रिया पर विस्तार से चर्चा कीजिए।
Practise this question Settlement Geography notes
Model answer
Paper and question: Paper I, Q6(a)
Approach: Explain the geometry of urban land values (bid-rent, PLVI, distance decay, secondary peaks) with a diagram and its link to urban structure models, then describe the methods of delimiting the CBD, especially Murphy and Vance's indices, with an Indian example.
Urban land values form a distinctive surface. William Alonso's bid-rent theory (1964) holds that users compete for accessible central land: commerce bids most at the centre, followed by industry, apartments and single-family housing, so land value falls with distance from the core, producing concentric zones like those of Burgess (1925).
Geometry: (i) the peak land value intersection (PLVI), usually the most accessible street junction in the CBD, has the highest value; (ii) values decline steeply at first and then gently outward, a distance-decay curve; (iii) ridges of higher value run along radial arterial roads and metro lines, giving a star-shaped surface, as Hoyt's sector model (1939) implies; (iv) secondary peaks occur at suburban business centres and road intersections, matching Harris and Ullman's multiple-nuclei model (1945). In Delhi, Connaught Place forms the historic peak, with secondary peaks at Nehru Place, Saket and Gurugram's Cyber City.
Diagram: Three-dimensional land-value surface with a tall central peak (PLVI), ridges along radial roads and smaller peaks at suburban nodes, with a bid-rent graph beneath showing commerce, industry and residence curves.
Delimiting the CBD: early methods used land values, building heights, pedestrian counts and the concentration of shops and offices. Murphy and Vance (1954) proposed two indices for blocks: the Central Business Height Index (total floor area in central business uses divided by the block's ground area) and the Central Business Intensity Index (central business floor area as a percentage of total floor area). A block belongs to the CBD if the height index is at least 1 and the intensity index at least 50 per cent, and the CBD is the contiguous set of such blocks around the PLVI.
In Indian cities, such as Kolkata's BBD Bagh-Chowringhee or Mumbai's Fort-Nariman Point, delimitation also uses traffic flow, daytime population and land-use surveys, since data on floor space are limited. The Murphy-Vance method fits Western cities better but remains the standard technique.
Q6(b) · Settlement Geography · 15 marks≈ 11 min
Urban Hierarchy, Primate City and Rank-size Rule
Analyse the measuring patterns of settlement in relation to the nearest Neighbour Index and Rank-Size-Rule in detail.
हिंदी में प्रश्न
निकटतम पड़ोसी सूचकांक और कोटि-आकार-नियम के संदर्भ में बस्तियों के मापन प्रणाली का विस्तृत विश्लेषण कीजिए।
Practise this question Settlement Geography notes
Model answer
Paper and question: Paper I, Q6(b)
Approach: Explain the nearest neighbour index (Clark and Evans) with its formula in words, values and an example, then the rank-size rule (Zipf) with its formula and interpretation, and compare what each measures and their limitations.
Settlement patterns have two measurable aspects: their spacing on the ground and their size distribution. The nearest neighbour index measures the first, and the rank-size rule the second.
Nearest neighbour index: developed by the ecologists Clark and Evans (1954) and applied to settlements by geographers such as King (1962). Rn equals twice the observed mean distance between each settlement and its nearest neighbour, multiplied by the square root of the density (number of settlements divided by area). Rn = 0 means total clustering, Rn = 1 a random pattern, and the maximum of about 2.15 a perfectly uniform, hexagonal pattern as predicted by Christaller.
Rank-size rule: proposed by G.K. Zipf (1949), following Auerbach (1913). The population of the city of rank r equals the population of the largest city divided by r; plotted on log-log paper, cities fall on a straight line with slope -1. Steeper slopes indicate primacy; gentler slopes an evenly developed hierarchy.
Diagram: Left: three dot maps with Rn values 0, 1 and 2.15. Right: log-log graph of rank against population showing the ideal line, a primate curve and a binary pattern.
Comparison and limits: Rn describes spatial arrangement but ignores size and depends on the study area's boundary; rank-size describes hierarchy but ignores location and depends on how cities are defined. Used together, for example on Census 2011 data for India's towns, they reveal both spacing and hierarchy of a settlement system.
Q6(c) · Climatology: Weather Systems, Climates and Climate Change · 15 marks≈ 11 min
Global Climate Change, Applied and Urban Climatology
Write an essay on disease and global warming according to the report of Intergovernmental Panel on Climate Change (IPCC).
हिंदी में प्रश्न
अन्तरसरकारी जलवायु परिवर्तन पैनल (IPCC) की रिपोर्ट के अनुसार बिमारियों एवं वैश्विक तापवृद्धि पर एक निबन्ध लिखिए।
Practise this question Climatology: Weather Systems, Climates and Climate Change notes
Model answer
Paper and question: Paper I, Q6(c)
Approach: Write a short essay on how global warming affects human disease according to the IPCC (mainly the Sixth Assessment Report, Working Group II, 2022): heat-related illness, vector-borne, water- and food-borne diseases, respiratory and mental health, and unequal vulnerability, ending with the adaptation measures it stresses; include a schematic diagram.
The Intergovernmental Panel on Climate Change, in its Sixth Assessment Report (Working Group II, 2022), concluded with very high confidence that climate change has already harmed people's physical health worldwide, and their mental health in the regions assessed.
Heat: more frequent and intense heat waves raise deaths from heat stroke and worsen heart, lung and kidney disease, especially among the elderly, outdoor workers and urban poor; South Asia, including India, is a hotspot.
Vector-borne diseases: warmer, wetter conditions extend the range and season of mosquitoes and ticks, so dengue, malaria and similar diseases are spreading to higher altitudes and latitudes, such as dengue appearing in new parts of Europe and the Himalayan foothills.
Water- and food-borne diseases: floods, heavy rain and warmer water increase cholera and diarrhoeal disease, while drought and heat reduce food quality and raise undernutrition. Wildfire smoke and ground-level ozone worsen respiratory illness, and disasters cause trauma, anxiety and displacement.
The IPCC projects these risks to grow with every increment of warming, falling hardest on low-income countries, children and those with poor health systems, which widens inequality.
Diagram: Flow diagram from rising temperature to heat stress, vectors, water and food, air quality and disasters, each leading to health outcomes.
The report stresses adaptation: heat action plans (Ahmedabad, 2013), early-warning and disease surveillance, safe water and sanitation, and climate-resilient health systems, alongside deep emission cuts.

Question 7 (50 marks)

Q7(a) · Perspectives in Human Geography · 20 marks≈ 14 min
Radical, Behavioural, Humanistic and Welfare Approaches
What are the main concerns of radical geography? Describe the salient features and objectives of radicalism in geography.
हिंदी में प्रश्न
उग्र भूगोल की प्रमुख चिन्ताएँ क्या हैं? भूगोल में अतिवाद की प्रमुख विशेषताओं और उद्देश्यों का वर्णन कीजिए।
Practise this question Perspectives in Human Geography notes
Model answer
Paper and question: Paper I, Q7(a)
Approach: Explain the context and main concerns of radical geography, then describe its salient features (Marxist base, structural explanation, activism) and its objectives, with thinkers, examples and a brief critique.
Radical geography emerged in North America and Britain in the late 1960s as a reaction against the 'value-free' spatial science of the quantitative revolution, against the backdrop of the Vietnam war, civil rights protests, urban riots and persistent poverty. The journal Antipode, launched at Clark University in 1969, became its voice.
Main concerns: poverty and hunger, racial and gender discrimination, housing and ghettos, uneven development between regions and nations, imperialism and environmental degradation. It asked who gains and who loses from spatial patterns rather than merely describing them.
Salient features: (i) a Marxist and anarchist philosophical base, drawing on Marx, Kropotkin and Reclus; (ii) structural explanation: spatial patterns are products of the capitalist mode of production, class relations and the state; (iii) rejection of positivism's neutrality, since research is always value-laden; (iv) historical materialism and dialectics as method; (v) a commitment to praxis, linking scholarship and activism.
Key contributors: David Harvey's Social Justice and the City (1973) and The Limits to Capital (1982); William Bunge's Detroit Geographical Expedition; Richard Peet; Neil Smith on uneven development and gentrification; Doreen Massey on spatial divisions of labour.
Diagram: Flow chart: capitalist mode of production → accumulation and class relations → uneven development (core-periphery, slums versus gated enclaves) → social injustice → radical geography's response (critique, policy, activism).
Objectives: to expose the causes of inequality; to achieve social and territorial justice; to reshape planning in favour of the poor; and to make geography relevant to social change. Indian applications include studies of displacement by dams and mines in central India, and slum evictions in Delhi and Mumbai.
Critics say it was over-deterministic, neglected individual agency and culture, and offered few practical solutions. Yet radical geography permanently brought ethics, power and justice into the discipline and paved the way for feminist, postcolonial and political-ecology approaches.
Q7(b) · Economic Geography · 15 marks≈ 11 min
World Agriculture: Typology, Inputs and Productivity
Discuss agricultural productivity and techniques adopted for computing efficiency in the levels of agricultural productivity.
हिंदी में प्रश्न
कृषि उत्पादकता और उसके स्तर के दक्षता की गणना के लिए अपनाई गई तकनीकों पर चर्चा कीजिए।
Practise this question Economic Geography notes
Model answer
Paper and question: Paper I, Q7(b)
Approach: Define agricultural productivity and efficiency, list the factors, then describe the main techniques of measurement (Kendall, Enyedi, Shafi, Bhatia, total factor productivity) and their limitations, with an Indian example.
Agricultural productivity is the ratio of agricultural output to inputs, most commonly output per unit of land (yield per hectare), but also per worker or per unit of all inputs. Agricultural efficiency compares the productivity of one area with others. It depends on physical factors (soil, rainfall, slope), technological factors (irrigation, seeds, fertiliser, machinery) and institutional factors (land tenure, credit, markets).
Techniques: (i) Kendall's ranking coefficient (1939): areal units are ranked by yield of each major crop and the ranks are averaged; the lower the average rank, the higher the efficiency; (ii) Enyedi's index (1964): yield of each crop in a unit is expressed as a ratio of the national or regional yield and weighted by crop area; (iii) Shafi's method: output per unit area of the main crops compared with the regional average; (iv) Bhatia's weighted yield index (1967): yield indices weighted by each crop's share of cropped area; (v) money value of output per hectare; (vi) total factor productivity, relating output to the combined use of land, labour, capital and other inputs.
Map: Choropleth of Indian districts by Kendall-type productivity index, showing high levels in Punjab, Haryana and western Uttar Pradesh and low levels in rainfed central India.
Limitations: ranking methods ignore the size of differences; yield indices neglect costs and sustainability; and data on inputs and prices are often weak. Combined indices with GIS give the most useful picture for planning.
Q7(c) · Population Geography · 15 marks≈ 11 min
Migration: Causes and Consequences
Elaborate partition of Indian subcontinent and international migration in detail.
हिंदी में प्रश्न
भारतीय उपमहाद्वीप के विभाजन तथा अन्तर्राष्ट्रीय प्रवासन का सविस्तार वर्णन कीजिए।
Practise this question Population Geography notes
Model answer
Paper and question: Paper I, Q7(c)
Approach: Describe the Partition of 1947 as a forced international migration (scale, direction, regions, causes, consequences and rehabilitation) with a map, then trace later international migration from and into the subcontinent.
The Partition of India in August 1947 created India and Pakistan (East and West) and triggered one of the largest forced migrations in history. Estimates suggest that about 12-15 million people crossed the new borders and between several hundred thousand and two million died in communal violence; exact figures remain debated.
Direction and regions: in the west, Hindus and Sikhs moved from West Punjab, Sindh and the North-West Frontier to East Punjab, Delhi and beyond, while Muslims moved from East Punjab, Delhi and Uttar Pradesh to Pakistan. In the east, migration from East Bengal to West Bengal, Assam and Tripura continued in waves for decades, especially after the riots of 1950 and 1964.
Consequences: refugee camps and new settlements such as Faridabad, Nilokheri and Rajpura, colonies in Delhi (Lajpat Nagar, Rajinder Nagar) and Kolkata; the rebuilding of Punjab's agriculture; resettlement of Bengali refugees in the Dandakaranya project (1958) and the Andaman Islands; and lasting demographic change in Tripura and Assam.
Map: Outline map of the subcontinent showing the Radcliffe Line in Punjab and Bengal, arrows of migration in both directions, and refugee settlements at Delhi, Faridabad, Chandigarh, Kolkata and Dandakaranya.
Later international migration: about 10 million refugees came from East Pakistan during the 1971 war; Tibetans and Sri Lankan Tamils also sought refuge. Outward, Indians migrated to Britain after the 1950s, to the Gulf after the 1970s oil boom and to North America as professionals. Today India has the world's largest diaspora and received about 129 billion US dollars in remittances in 2024 (World Bank), the highest in the world.

Question 8 (50 marks)

Q8(a) · Settlement Geography · 20 marks≈ 14 min
Urbanisation: Problems, Remedies and Sustainable Cities
What are the principles of urban planning? Critically analyse town planning in India in the post independence period.
हिंदी में प्रश्न
नगरीय नियोजन के सिद्धांत क्या हैं? स्वतंत्रतोत्तर भारत में नगर नियोजन का आलोचनात्मक विश्लेषण कीजिए।
Practise this question Settlement Geography notes
Model answer
Paper and question: Paper I, Q8(a)
Approach: State the main principles of urban planning with their proponents, then critically analyse post-independence town planning in India in phases (new capitals and master plans, new towns, missions after 2005) with achievements and failures, and conclude.
Urban planning is the deliberate organisation of land use, infrastructure and services for efficient, healthy and equitable cities. Its principles include: survey before plan (Patrick Geddes); zoning and land-use separation; the garden city ideal of balanced town and country (Ebenezer Howard, 1898); the neighbourhood unit (Clarence Perry, 1929); hierarchy of roads and open spaces; mixed use and compactness; public participation; and, today, sustainability, resilience and transit-oriented development.
Phase 1 (1947-1970s): new capitals and planned towns: Chandigarh (Le Corbusier), Bhubaneswar (Otto Koenigsberger), Gandhinagar, and refugee towns such as Faridabad; steel towns at Bhilai, Rourkela and Durgapur; Delhi's first Master Plan (1962) under the DDA, followed by master plans for other cities.
Phase 2 (1970s-1990s): counter-magnet and new towns such as Navi Mumbai (1971); the Integrated Development of Small and Medium Towns scheme (1979); the 74th Constitutional Amendment (1992) giving planning functions to urban local bodies.
Phase 3 (2005 onwards): JNNURM (2005), and since 2015 the Smart Cities Mission, AMRUT, PMAY-Urban and Swachh Bharat (Urban); URDPFI guidelines (2014) and metro rail expansion in over twenty cities.
Map: Outline map of India marking Chandigarh, Bhubaneswar, Gandhinagar, Navi Mumbai, Bhilai and Rourkela, and selected Smart Cities.
Critique: master plans have been rigid, slow and outdated on approval; large shares of growth occurred outside plans, in slums, unauthorised colonies and peri-urban sprawl; parastatal agencies weakened local bodies; land markets and speculation, not plans, shaped cities; planning neglected the poor, informal livelihoods and environment, leading to floods in Mumbai (2005), Chennai (2015) and Bengaluru (2022). Smart Cities funds were concentrated in small 'area-based' pockets.
The way forward is decentralised, participatory, climate-sensitive and inclusive planning, with empowered metropolitan planning committees and integration of land use and transport.
Q8(b) · Perspectives in Human Geography · 15 marks≈ 11 min
Languages, Religions, Cultural Regions and the Human Development Index
What are the approaches of human development? Describe in detail the measures for computing human development index.
हिंदी में प्रश्न
मानव विकास के उपागम क्या हैं? मानव विकास सूचकांक की गणना के लिए उपयोग किए जाने वाले उपायों का सविस्तार वर्णन कीजिए।
Practise this question Perspectives in Human Geography notes
Model answer
Paper and question: Paper I, Q8(b)
Approach: First list the four approaches to human development (income, welfare, basic needs, capability), then describe in detail how the HDI is computed (dimensions, indicators, goalposts, geometric mean) with India's latest value, and add the adjusted indices.
Human development, in Mahbub ul Haq's words, is the process of enlarging people's choices. Four approaches exist: (i) the income approach, equating development with income; (ii) the welfare approach, treating people as beneficiaries of state spending on education, health and social security; (iii) the basic needs approach (ILO, 1976), focusing on food, shelter, health, water and education; and (iv) the capability approach of Amartya Sen, which sees development as expanding what people can be and do.
The HDI, launched by UNDP in 1990, measures three dimensions. Health: life expectancy at birth. Education: mean years of schooling of adults aged 25 and above and expected years of schooling of children. Standard of living: GNI per capita (PPP dollars), on a log scale because income has diminishing returns.
Computation: each indicator is turned into a dimension index using goalposts, index = (actual minus minimum) divided by (maximum minus minimum). The goalposts are 20 and 85 years for life expectancy, 0-15 and 0-18 years for the two schooling indicators, and 100 and 75,000 PPP dollars for income. The two education indices are averaged, and since 2010 the HDI is the geometric mean of the three dimension indices, so poor performance in one cannot be fully offset by another.
Diagram: Tree: HDI at the top, three branches (long and healthy life, knowledge, decent standard of living), each with its indicator and dimension index.
In the Human Development Report 2025, India ranked 130 of 193 with an HDI of 0.685 (2023 data), in the medium group.
Q8(c) · Models, Theories and Laws in Human Geography · 15 marks≈ 11 min
Heartland and Rimland Theories; Boundaries and Frontiers
Explain the Rimland Theory with reference to ongoing geopolitical scenario in the world.
हिंदी में प्रश्न
विश्व में वर्तमान में चल रहे भू-राजनीतिक परिदृश्य के सन्दर्भ में रिमलैण्ड सिद्धांत की व्याख्या कीजिए।
Practise this question Models, Theories and Laws in Human Geography notes
Model answer
Paper and question: Paper I, Q8(c)
Approach: State Spykman's Rimland theory with its dictum, then apply it to the ongoing scenario (Indo-Pacific, South China Sea, Ukraine and Eastern Europe, West Asia, India's position), with a map, and give a brief evaluation.
Nicholas Spykman, in The Geography of the Peace (1944), modified Mackinder by arguing that the decisive zone was not the Heartland but the Rimland, the densely populated, resource-rich coastal belt of Eurasia from Western Europe through the Middle East and South Asia to East Asia. His dictum: who controls the Rimland rules Eurasia; who rules Eurasia controls the destinies of the world.
The theory shaped Cold War containment: NATO, CENTO and SEATO ringed the Soviet Union along the Rimland.
Ongoing scenario: (i) Indo-Pacific: China's rise along the East Asian Rimland, militarisation in the South China Sea and pressure on Taiwan are countered by US alliances with Japan, South Korea and the Philippines, the Quad (India, USA, Japan, Australia) and AUKUS (2021); (ii) Eastern Europe: the Russia-Ukraine war since 2022 is a contest over the Heartland-Rimland frontier, with NATO enlarged to Finland (2023) and Sweden (2024); (iii) West Asia: conflict around Gaza, the Red Sea attacks on shipping and Iran's role affect Rimland chokepoints; (iv) China's Belt and Road ports (Gwadar, Hambantota, Kyaukpyu) are seen as a Rimland strategy; (v) India sits at the centre of the Rimland and the Indian Ocean, making it a pivotal swing power.
Map: Eurasia with the Heartland in the interior and the Rimland arc from Western Europe to Japan shaded, marking NATO's eastern flank, Ukraine, the Strait of Hormuz, the Red Sea, the South China Sea, Taiwan and India.
Evaluation: the theory explains why most current flashpoints lie on Eurasia's rim, but nuclear weapons, economic interdependence, cyber and space power reduce the determinism of pure geography.

UPSC Mains 2026 Geography Paper II