UPSC Mains 2019 Geography Optional Question Papers with Model Answers

All 55 questions of the 2019 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 2019 Geography Paper I

Question 1 (50 marks)

Q1(a) · The Earth's Interior and Tectonics · 10 marks≈ 7 min
Volcanicity, Earthquakes and Tsunamis
Describe phreatic eruptions and their consequences.
हिंदी में प्रश्न
अग्राशय विस्फोटों और उनके परिणामों का वर्णन कीजिए।
Practise this question The Earth's Interior and Tectonics notes
Model answer
Paper and question: Paper I, Q1(a)
Approach: Define phreatic (steam-driven) eruptions and how they differ from magmatic ones, explain their mechanism, then list consequences with named examples; add a sketch of the hydrothermal system.
A phreatic eruption is a steam-driven explosion that occurs when groundwater or surface water is heated by magma or hot rock and flashes to steam. Unlike a magmatic eruption, it ejects fragments of existing rock, not fresh magma; when magma itself mixes with water the eruption is called phreatomagmatic.
Mechanism: water in a hydrothermal system is sealed beneath a cap of altered rock; pressure builds until the seal fails and steam expands violently, blasting a crater. They often come with little warning, as precursors are weak.
Consequences: (i) sudden ballistic blocks and ash that endanger people near vents; (ii) toxic gases such as carbon dioxide and hydrogen sulphide; (iii) mudflows (lahars) and acid crater-lake floods; (iv) craters and explosion pits; (v) they may precede larger magmatic eruptions.
Examples: Mount Ontake, Japan (September 2014), killed over 60 hikers; Whakaari/White Island, New Zealand (December 2019), killed tourists on the crater floor.
Diagram: Section showing magma heating a groundwater aquifer under a clay cap, steam build-up and explosion crater.
Phreatic eruptions call for continuous gas and ground monitoring and restricted access at tourist volcanoes.
Q1(b) · Climatology: Weather Systems, Climates and Climate Change · 10 marks≈ 7 min
Classification of World Climates (Koppen, Thornthwaite, Trewartha)
Explain the techniques to calculate potential evapotranspiration suggested by Thornthwaite.
हिंदी में प्रश्न
संभाव्य वाष्पन-वाष्पोत्सर्जन का परिकलन करने की थॉर्नथ्वेट द्वारा सुझाई गई तकनीकों को स्पष्ट कीजिए।
Practise this question Climatology: Weather Systems, Climates and Climate Change notes
Model answer
Paper and question: Paper I, Q1(b)
Approach: Define potential evapotranspiration, then explain Thornthwaite's techniques: field measurement with evapotranspirometers and his empirical temperature formula (heat index, exponent, day-length correction); note limits; show the steps as a flow diagram.
Potential evapotranspiration (PE) is the amount of water that would evaporate and transpire from a surface fully covered by vegetation if soil water were never limiting. C.W. Thornthwaite introduced the concept and made it the basis of his 1948 classification.
Measurement: Thornthwaite used evapotranspirometers (lysimeters), moist soil tanks with growing grass in which water added minus water drained gives the loss.
Empirical formula: as such data were scarce, he related PE to mean monthly temperature (T, °C). First, a monthly heat index i = (T/5) raised to the power 1.514 is computed and summed for twelve months to give the annual heat index I. Unadjusted PE = 16 × (10T/I) raised to the power a, in mm per month, where a is an empirically derived function of I.
This assumes a 30-day month and 12-hour days, so it is corrected for day length by latitude and month length.
Diagram: Flow chart: mean monthly temperature → heat index i → annual index I → exponent a → unadjusted PE → day-length correction → monthly PE.
Needing only temperature, it ignores wind and humidity and underestimates PE in arid areas; Penman's method is more physical.
Q1(c) · Oceanography · 10 marks≈ 7 min
Waves, Currents and Tides
How are sandspits and tombolos formed?
हिंदी में प्रश्न
सैंडस्पिट और टोम्बोलो किस प्रकार बनते हैं?
Practise this question Oceanography notes
Model answer
Paper and question: Paper I, Q1(c)
Approach: Explain longshore drift as the common process, then describe step by step how a spit and a tombolo form, with Indian and world examples; draw plan sketches of a spit and a tombolo.
Sandspits and tombolos are depositional coastal landforms built of sand and shingle moved by longshore drift, the zig-zag transport of sediment along the shore when waves approach obliquely.
Sandspit: where the coastline changes direction abruptly, as at a headland or river mouth, the drift continues into deeper, calmer water and deposits sediment. A narrow ridge of sand grows out from the land, attached at one end and free at the other; wave refraction often curves its tip into a hook. Examples: Kakinada spit at the Godavari delta, the sandbar enclosing Chilika lake, and Spurn Head in England.
Tombolo: when an island lies close to the shore, waves refract around it and lose energy in its lee, so sediment accumulates until a bar joins the island to the mainland. Examples: Chesil Beach linking the Isle of Portland to Dorset, and the double tombolo of Monte Argentario in Italy.
Diagram: Plan sketches showing oblique waves, longshore drift arrows, a recurved spit at a bend in the coast and a tombolo joining an island to the mainland.
Both are dynamic and can be breached by storms or starved by dams and sand mining upstream.
Q1(d) · Environmental Geography · 10 marks≈ 7 min
Principles of Ecology and Human Ecological Adaptations
Amensalism is a biotic factor that determines the geographic limits of species. Explain.
हिंदी में प्रश्न
सहजीविता एक जैव कारक है, जो स्पीशीज की भौगोलिक सीमाओं का निर्धारण करता है। व्याख्या कीजिए।
Practise this question Environmental Geography notes
Model answer
Paper and question: Paper I, Q1(d)
Approach: Define amensalism as a minus–zero interaction, explain its two mechanisms (antibiosis or allelopathy, and competition by a dominant species) and show with examples how it limits where species can grow. A small interaction table or diagram of an allelopathic bare zone helps.
Amensalism is an interaction between two species in which one is harmed or inhibited while the other is neither helped nor harmed (a minus–zero interaction). It is a biotic factor that decides where a species can survive, beyond limits set by climate and soil.
Antibiosis and allelopathy: the fungus Penicillium releases penicillin that kills nearby bacteria. Plants release chemicals that stop the germination or growth of others: black walnut produces juglone; eucalyptus, Parthenium and Lantana camara suppress native ground flora in India.
Diagram: A shrub clump with a ring of bare ground around it and grassland beyond, labelled 'allelochemicals inhibit grasses'.
Shading: a tall tree shading out light-demanding herbs harms the weaker organism with no benefit to the stronger.
These effects fix the geographic limits of species: under a dense sal or teak canopy only shade-tolerant herbs occur; Lantana and Prosopis juliflora invasions in the Western Ghats, Kutch and the Deccan have pushed native grasses out of large areas, affecting grazers and pastoralists.
Thus amensalism shapes community composition and species ranges, and it matters for weed control and invasive species management.
Q1(e) · Environmental Geography · 10 marks≈ 7 min
Ecosystems, Ecological Imbalances and Environmental Degradation
How do mountaineers constitute a threat to Mount Everest?
हिंदी में प्रश्न
पर्वतारोही माउन्ट एवरेस्ट के लिए किस प्रकार ख़तरा हैं?
Practise this question Environmental Geography notes
Model answer
Paper and question: Paper I, Q1(e)
Approach: Explain the threats mountaineers pose to Everest (waste, overcrowding, pollution of glaciers and water, pressure on vegetation and local ecology) and end with measures taken by Nepal. A sketch of the Khumbu route with camps helps.
Mount Everest (8,849 m, Nepal–China joint survey, 2020) lies in Sagarmatha National Park, a UNESCO World Heritage Site. Hundreds of climbers and thousands of trekkers visit each spring, and their impact on this cold, slow-to-recover environment is serious.
Solid waste: discarded oxygen cylinders, tents, ropes and packaging accumulate at Base Camp and the high camps, especially the South Col. Cold prevents decomposition.
Human waste and water pollution: faeces left on the mountain and around Base Camp contaminate meltwater that flows down the Khumbu Glacier to villages; microplastics have been found in snow near the summit.
Overcrowding: long queues on the summit ridge in May 2019 increased deaths from exhaustion and altitude sickness.
Diagram: Sketch of the south route: Lukla → Namche Bazaar → Base Camp → Khumbu Icefall → Camps I–IV (South Col) → summit, marking waste hotspots.
Pressure on the valley: demand for fuelwood and lodges once cleared juniper and rhododendron scrub.
Nepal requires a refundable garbage deposit from climbing teams, the Sagarmatha Pollution Control Committee manages waste, and periodic clean-up drives are held. Limits on permits and stricter rules on human waste are needed so that adventure tourism remains sustainable.

Question 2 (50 marks)

Q2(a) · Environmental Geography · 20 marks≈ 14 min
Biodiversity and Sustainable Development
Why is it necessary to conserve genetic diversity of species? Do protected areas serve any useful purpose in this context?
हिंदी में प्रश्न
स्पीशीज़ की आनुवंशिक विविधता का संरक्षण करना किस कारण आवश्यक है? क्या संरक्षित क्षेत्र इस संबंध में कोई उपयोगी प्रयोजन अदा करते हैं?
Practise this question Environmental Geography notes
Model answer
Paper and question: Paper I, Q2(a)
Approach: Define genetic diversity, give the reasons for conserving it (adaptation, food security, medicine) with examples, then assess the role of protected areas, both their strengths and limits, and conclude with complementary measures; draw the zonation of a biosphere reserve.
Genetic diversity is the variety of genes within a species, the base level of biodiversity alongside species and ecosystem diversity. It is the raw material of evolution and of crop and livestock breeding.
Adaptation: varied gene pools let species survive disease, pests and climate change, while small uniform populations suffer inbreeding depression. The single wild population of Asiatic lions in Gir is the classic Indian concern.
Food security: genetic uniformity caused the Irish potato famine of the 1840s and the 1970 southern corn leaf blight in the USA. India, part of Vavilov's Hindustan centre of origin, holds many traditional rice varieties, notably in the Jeypore tract of Koraput, Odisha.
Medicine and livelihoods: wild species supply drugs; the Kani tribe's knowledge of arogyapacha in Kerala led to the Jeevani drug and an early benefit-sharing model.
Role of protected areas: they conserve genes in situ, where evolution continues under natural selection. Biosphere reserves under UNESCO's Man and the Biosphere programme (1971) protect a core with buffer and transition zones; Nokrek in Meghalaya shelters wild Citrus indica, and tiger reserves under Project Tiger (1973) and Kaziranga sustain viable populations of tigers and rhinos.
Diagram: Concentric zonation of a biosphere reserve: inner core (strict protection), buffer (research, regulated use) and outer transition zone (settlements, sustainable use), with arrows for wildlife corridors linking reserves.
Yet protected areas have limits. Small isolated reserves behave like islands where gene flow stops (MacArthur and Wilson's island biogeography, 1967), climate change shifts species beyond fixed boundaries, and crop diversity survives on farms, not in parks.
Protected areas are therefore necessary but not sufficient. They must be combined with corridors, ex situ gene banks such as NBPGR in New Delhi and the Svalbard Global Seed Vault, and on-farm conservation backed by the Protection of Plant Varieties and Farmers' Rights Act 2001.
Q2(b) · The Earth's Interior and Tectonics · 15 marks≈ 11 min
Plate Tectonics and Mountain Building
Compare and contrast different types of plate boundaries.
हिंदी में प्रश्न
विभिन्न प्रकार की प्लेट सीमाओं के बीच समानताएँ और विषमताएँ स्पष्ट कीजिए।
Practise this question The Earth's Interior and Tectonics notes
Model answer
Paper and question: Paper I, Q2(b)
Approach: Compare and contrast divergent, convergent (three sub-types) and transform boundaries on motion, crust, landforms, earthquakes and volcanism with named examples, noting common features and differences; include a block diagram.
Plates interact along three kinds of boundaries, classed by relative motion. All are zones of concentrated earthquakes, but they differ in whether crust is created, destroyed or conserved.
Divergent (constructive): plates move apart and magma rises to form new crust. Ocean examples are the Mid-Atlantic Ridge and East Pacific Rise; on land, the East African Rift and Red Sea show early stages. Features: ridges, rift valleys, shallow earthquakes, basaltic fissure volcanism (Iceland).
Convergent (destructive): plates collide and crust is consumed. (a) Ocean–continent: the denser plate subducts, forming a trench and volcanic fold range (Peru–Chile Trench, Andes). (b) Ocean–ocean: an island arc forms (Mariana Trench, Japan). (c) Continent–continent: buoyant crust cannot subduct and is thickened (Himalaya). Earthquakes reach about 700 km deep along the inclined Benioff zone; volcanoes are explosive andesitic, except in collision zones.
Transform (conservative): plates slide past each other and crust is neither made nor destroyed, as on the San Andreas Fault and the Alpine Fault of New Zealand, and across ridge offsets. Earthquakes are shallow but can be strong; there is no volcanism.
Diagram: Block diagram showing a spreading ridge offset by transform faults, a subduction zone with trench and volcanic arc, and a collision zone with folded mountains.
Contrast in brief: divergent boundaries are tensional, convergent compressional and transform shearing; only convergent boundaries have deep earthquakes and great mountains. Many boundaries are mixed, as in the oblique Sumatra subduction zone, so real margins often combine types.
Q2(c) · Climatology: Weather Systems, Climates and Climate Change · 15 marks≈ 11 min
Global Climate Change, Applied and Urban Climatology
Explain the nature of urban climates and their impact on global environmental change.
हिंदी में प्रश्न
नगरीय जलवायु की प्रकृति व वैश्विक पर्यावरण परिवर्तन पर उनके प्रभाव की व्याख्या कीजिए।
Practise this question Climatology: Weather Systems, Climates and Climate Change notes
Model answer
Paper and question: Paper I, Q2(c)
Approach: Explain the nature of urban climates (heat island, humidity, wind, rainfall, pollution, with the urban boundary layer) and then their impact on global environmental change (emissions, land-use change, aerosols, feedbacks), with examples and a temperature-profile diagram.
Cities create their own climate by replacing vegetation with concrete, releasing heat and pollutants and altering airflow. Luke Howard first described London's warmth in The Climate of London (1818–20), and T.R. Oke later explained the urban boundary layer.
Nature: (i) the urban heat island: city centres are warmer than the countryside, most strongly on calm, clear nights, as buildings store heat and release it slowly; (ii) lower relative humidity, but more fog and haze around particles; (iii) lower average wind speeds, with gusty channelling between tall buildings; (iv) more convective rain downwind, as shown by the METROMEX study of St. Louis; (v) polluted air and pollution domes, as in Delhi's winter smog.
Impact on global change: cities are home to over half of humanity (55% in 2018, projected 68% by 2050, UN DESA) and the IPCC (2022) attributes roughly two-thirds or more of global greenhouse gas emissions to urban areas through energy, transport and construction. Urban expansion converts forests, wetlands and farmland, reducing carbon sinks. Aerosols and ozone from cities affect radiation and regional climate.
Feedbacks: heat islands raise air-conditioning demand and emissions, while global warming makes urban heat waves deadlier.
Diagram: Temperature profile across a rural–suburban–urban–rural transect showing the heat island peak over the city centre.
Cities are therefore both drivers and victims of global change; green roofs, urban forests, efficient transport and heat action plans such as Ahmedabad's (2013) help on both counts.

Question 3 (50 marks)

Q3(a) · Climatology: Atmosphere and Circulation · 20 marks≈ 14 min
Atmospheric Circulation, Planetary and Local Winds
Discuss in detail the tri-cellular model of atmospheric circulation.
हिंदी में प्रश्न
वायुमंडलीय परिसंचरण के त्रि-कोशिकीय मॉडल की विस्तार से विवेचना कीजिए।
Practise this question Climatology: Atmosphere and Circulation notes
Model answer
Paper and question: Paper I, Q3(a)
Approach: Discuss the model in detail: its basis (heat imbalance and rotation), each cell with its pressure belts and surface winds, the seasonal shift, and its limitations and later refinements. Draw the three-cell model with pressure belts and winds.
The tri-cellular model describes the general circulation of the atmosphere as three meridional cells in each hemisphere. George Hadley (1735) proposed one thermal cell per hemisphere; William Ferrel (1856) added the mid-latitude cell, giving the three-cell scheme found in standard texts.
Basis: the tropics have a radiation surplus and the poles a deficit, so heat must move poleward. On a rotating earth the Coriolis force deflects poleward-moving air, breaking a single cell into three.
Hadley cell (0°–30°): a thermally direct cell. Air heated at the equator rises in the ITCZ, forming the equatorial low; it flows poleward aloft, cools, converges and sinks near 30°, creating the subtropical highs. Surface air returns as the north-east and south-east trade winds.
Ferrel cell (30°–60°): a thermally indirect cell driven by its neighbours, with surface air moving poleward from the subtropical highs as the westerlies and rising at the subpolar low near 60°.
Polar cell (60°–90°): cold, dense air sinks over the poles to form the polar highs and flows equatorward as polar easterlies; their meeting with the westerlies forms the polar front.
Diagram: Globe divided at 0°, 30°, 60° and 90°; vertical loops for Hadley, Ferrel and polar cells in each hemisphere, with L at 0° and 60°, H at 30° and 90°, surface arrows for trades, westerlies and polar easterlies, and jet symbols near 30° and 60°.
Seasonal shift: the cells move about 5–10° with the overhead sun, explaining Mediterranean winter rain and the Indian monsoon.
Limitations: the Ferrel cell does not exist as a closed loop in reality; Rossby (1940s) and Palmén showed that mid-latitude heat transfer occurs mainly through upper-air Rossby waves, jet streams and travelling cyclones. Land-sea contrast also breaks the belts into cells such as the Siberian High.
Despite simplification, the model explains the broad zones of pressure, winds and rainfall on the earth.
Q3(b) · Biogeography · 15 marks≈ 11 min
Soil Genesis, Profile, Classification and Distribution
How are soil acidity and alkalinity related to soil fertility?
हिंदी में प्रश्न
मृदा अम्लता व क्षारीयता किस प्रकार मृदा उर्वरता से संबंधित हैं?
Practise this question Biogeography notes
Model answer
Paper and question: Paper I, Q3(b)
Approach: Explain soil pH and the nutrient-availability optimum, then how acidity and alkalinity each reduce fertility, with Indian regions and remedies; draw Truog’s pH–nutrient availability chart.
Soil reaction (pH) measures the acidity or alkalinity of soil on a scale of 0 to 14. It controls fertility because it decides which nutrients are soluble and how active soil microbes are; most nutrients are best available between about pH 6 and 7.5.
Acidic soils (below about pH 5.5) form where heavy rain leaches calcium, magnesium and potassium, as in the laterites of the Western Ghats and Kerala and the hill soils of north-east India. Aluminium and manganese reach toxic levels, phosphorus is locked by iron and aluminium, and nitrogen-fixing bacteria slow down. Liming corrects them, though tea in Assam and Darjeeling thrives in acid soil.
Alkaline and sodic soils (above about pH 8.5) form in dry areas and under poorly drained canal irrigation, where evaporation leaves salts and sodium. These usar, reh or kallar lands of Uttar Pradesh, Haryana and Punjab show poor structure, crusting, low water entry and shortage of iron, zinc and phosphorus. Gypsum and good drainage reclaim them; ICAR-CSSRI (Karnal) estimates about 6.7 million ha of salt-affected soils in India.
Diagram: Truog’s chart (1946): pH 4 to 10 on the horizontal axis with bands for N, P, K, Ca, Mg, S, Fe, Mn, Zn and B whose width shows availability; most bands are widest between pH 6 and 7.5.
Fertility therefore peaks near neutral pH, and testing it through the Soil Health Card scheme (2015) guides correct amendments.
Q3(c) · Environmental Geography · 15 marks≈ 11 min
Ecosystems, Ecological Imbalances and Environmental Degradation
"The web of life is seamless and the consequences of disruption to one part of the ecosystem ripple throughout the whole." Elaborate.
हिंदी में प्रश्न
"जीवन की चादर किसी जोड़ के बिना है और पारिस्थितिक तंत्र के किसी एक भाग में विघटन के परिणामों की लहरें समस्त में व्याप्त हो जाती हैं।" सुस्पष्ट कीजिए।
Practise this question Environmental Geography notes
Model answer
Paper and question: Paper I, Q3(c)
Approach: Explain the interconnectedness of ecosystems through food webs, keystone species, trophic cascades and nutrient cycles, illustrate ripple effects with Indian and world cases, and conclude on conservation implications. A food-web diagram showing a cascade is essential.
An ecosystem is a network in which organisms are linked through food webs, energy flow and nutrient cycles to each other and to the physical environment. Because of these links, a change in one component spreads to others, as Barry Commoner put it in his first law of ecology: everything is connected to everything else.
Food webs and keystone species: Robert Paine showed (1966) that removing the predatory starfish Pisaster from rocky shores let mussels take over and reduced species diversity. Such keystone species have effects far larger than their numbers.
Trophic cascades: the decline of sea otters let sea urchins multiply and destroy kelp forests in the North Pacific; the return of wolves to Yellowstone in 1995 is widely linked to recovery of riverside vegetation, though the strength of this effect is debated.
Indian examples: the veterinary drug diclofenac caused a collapse of vulture populations in the 1990s; uncleared carcasses then supported more feral dogs, raising rabies risk.
Human interventions: China's campaign against sparrows in 1958 led to locust outbreaks; the introduction of Nile perch into Lake Victoria wiped out many native cichlid species.
Diagram: Food web of a kelp forest: sea otter → sea urchin → kelp → fish and invertebrates, with arrows showing how removing the otter causes urchin increase and kelp loss.
Hence conservation must protect whole ecosystems and their functional links rather than single species, through ecosystem-based management, landscape-level protected areas and corridors.

Question 4 (50 marks)

Q4(a) · The Earth's Interior and Tectonics · 20 marks≈ 14 min
Volcanicity, Earthquakes and Tsunamis
Discuss the methods of measuring the intensity and magnitude of earthquakes. How are seismic zones demarcated?
हिंदी में प्रश्न
भूकंपों की तीव्रता व परिमाण मापने की विधियों की विवेचना कीजिए। भूकंपी क्षेत्रों का सीमांकन कैसे किया जाता है?
Practise this question The Earth's Interior and Tectonics notes
Model answer
Paper and question: Paper I, Q4(a)
Approach: Distinguish intensity from magnitude, discuss the scales and instruments for each (Mercalli, MSK; Richter, body/surface-wave, moment magnitude), then explain how seismic zones are demarcated, with India's IS 1893 zones as the example and a zone map.
An earthquake is measured in two ways. Magnitude measures the energy released at the source and is one value per earthquake; intensity measures the effects of shaking at a place and varies with distance, depth and ground conditions.
Intensity scales are descriptive, based on felt reports and damage: the Rossi–Forel scale (1883), the Mercalli scale (1902), the Modified Mercalli scale (1931, I to XII) and the MSK-64 scale (I to XII) used in India. Lines joining places of equal intensity, isoseismals, map the pattern of damage and locate the epicentral area.
Magnitude is instrumental, read from seismographs. Charles Richter's local magnitude (1935) is logarithmic: each whole number means ten times the wave amplitude and about 32 times the energy. Body-wave and surface-wave magnitudes extend it, but they saturate for great earthquakes, so the moment magnitude scale (Hanks and Kanamori, 1979), based on fault area, slip and rock rigidity, is now standard.
Demarcation of seismic zones uses: (i) the historical and instrumental record of earthquakes; (ii) maximum intensities observed; (iii) tectonic setting, active faults and thrusts; (iv) probabilistic hazard estimates of peak ground acceleration; (v) local soil and geology.
In India the Bureau of Indian Standards code IS 1893 (Part 1) divides the country into four zones, II to V, with zone factors of 0.10, 0.16, 0.24 and 0.36. Zone V covers the North-East, parts of Jammu and Kashmir, Himachal Pradesh and Uttarakhand, the Rann of Kutch, north Bihar and the Andaman and Nicobar Islands; the Peninsula lies mostly in zones II and III, though the Latur (1993) quake showed it is not immune.
Map: Outline map of India showing seismic zones II–V, with Zone V shaded along the Himalaya, North-East, Kutch and the Andaman Islands.
Zone maps are revised as data improve and guide building codes, land-use planning and disaster preparedness.
Q4(b) · Environmental Geography · 15 marks≈ 11 min
Environmental Hazards, Policy, Education and Legislation
The impact of floods on life and property can be most effectively reduced by hazard mapping. Comment.
हिंदी में प्रश्न
संकट मानचित्रण के द्वारा जान व माल पर बाढ़ों के प्रभाव को सर्वाधिक प्रभावी रूप से कम किया जा सकता है। टिप्पणी कीजिए।
Practise this question Environmental Geography notes
Model answer
Paper and question: Paper I, Q4(b)
Approach: Define flood hazard mapping, show how it reduces losses, give Indian and world practice, then weigh its limits and conclude that mapping works only with enforcement and other measures; draw a flood hazard zonation sketch of a valley.
Flood hazard mapping delineates areas likely to be inundated by floods of given return periods, such as 25, 50 or 100 years, and grades them by depth and frequency. The Rashtriya Barh Ayog (1980) estimated India's flood-prone area at about 40 million hectares.
How it reduces losses: maps guide floodplain zoning, keeping hospitals, schools and dense housing out of high-risk zones. They also guide evacuation routes, shelters, insurance premiums and the siting of embankments, and combined with forecasts they show who must move first.
Indian practice: NRSC (ISRO) has prepared flood hazard atlases for Assam and Bihar from years of satellite records. The CWC circulated a model floodplain zoning bill in 1975, but few states, such as Manipur, enacted it.
World practice: the US National Flood Insurance Program prices cover through flood insurance rate maps, and the Netherlands' Room for the River programme used mapped zones to give rivers more space.
Map: Sketch of a river valley in plan: channel, high-hazard zone (frequent floods, no construction), moderate zone (100-year flood, restricted use such as parks and farms) and low-hazard zone (settlement with raised plinths).
Limits: maps are only as effective as their enforcement, and encroachment continues in Chennai, Mumbai and Srinagar. Rivers like the Kosi shift course and make maps obsolete, climate change alters return periods, and poor households may have no alternative to risky land.
Hazard mapping is thus the most cost-effective foundation, but it reduces losses only when tied to land-use law, early warning, insurance and community preparedness.
Q4(c) · Oceanography · 15 marks≈ 11 min
Waves, Currents and Tides
How are ocean waves formed? Distinguish between a wave of oscillation and a wave of translation.
हिंदी में प्रश्न
समुद्री तरंगें कैसे बनती हैं? दोलन की तरंग और स्थानांतरण की तरंग के बीच विभेदन कीजिए।
Practise this question Oceanography notes
Model answer
Paper and question: Paper I, Q4(c)
Approach: Explain how wind generates waves (theories, fetch, duration, speed) and wave anatomy, then distinguish waves of oscillation from waves of translation on particle motion, location and effects; draw both wave types approaching a shore.
Ocean waves are undulations of the water surface that transfer energy, not water, across the sea. Most are generated by wind; tsunamis come from earthquakes and landslides.
Formation: wind blowing over calm water creates ripples through friction and pressure differences; Jeffreys' sheltering hypothesis (1925) and later theories of Phillips and Miles (1957) explain how waves grow. Wave height and length increase with wind speed, its duration and the fetch, the open distance over which it blows. In the generating area waves are steep and irregular (sea); outside it they travel as regular swell.
Wave of oscillation: in deep water, where depth exceeds half the wavelength, water particles move in circular orbits that shrink with depth and return to their position; only the form moves forward. Such waves cross open oceans as swell.
Wave of translation: as a wave enters water shallower than half its wavelength, the orbits drag on the bottom and flatten, the wave slows, steepens and breaks; water then moves forward bodily as surf and swash up the beach, with backwash returning. These waves erode, transport and deposit sediment, shaping beaches.
Diagram: Profile from deep sea to beach showing circular orbits under oscillatory waves, flattened orbits in shallow water, the breaker zone and swash and backwash.
Every wind wave thus begins as an oscillation and ends as translation on the coast, where its energy does geomorphic work.

Question 5 (50 marks)

Q5(a) · Perspectives in Human Geography · 10 marks≈ 7 min
Languages, Religions, Cultural Regions and the Human Development Index
"A language originates at a particular place and diffuses to other locations through the migration of its speakers." Examine this statement in the context of language hot spots and endangered language hot spots.
हिंदी में प्रश्न
"भाषा एक विशेष स्थान पर उत्पन्न होती है और इसके बोलने वालों के प्रवास के माध्यम से अन्य स्थानों में फैलती है।" भाषा हॉट स्पॉटों और संकटापन्न भाषा हॉट स्पॉटों के संदर्भ में इस कथन का परीक्षण कीजिए।
Practise this question Perspectives in Human Geography notes
Model answer
Paper and question: Paper I, Q5(a)
Approach: Explain language origin and diffusion through migration with an example (Indo-European), then define language hot spots and endangered language hot spots with examples including India, and conclude.
Languages, like other cultural traits, have hearths and spread by relocation diffusion as speakers migrate. Proto-Indo-European is thought to have originated either in the steppes north of the Black Sea (Kurgan hypothesis, Marija Gimbutas) or in Anatolia with early farmers (Colin Renfrew); the debate continues. Its speakers' migrations carried daughter languages from Ireland to India. Bantu languages spread across sub-Saharan Africa with farming migrants, and English, Spanish and Portuguese spread with colonial settlers.
Language hot spots, identified by the Enduring Voices project of National Geographic and the Living Tongues Institute (Harrison and Anderson, 2007), are regions with high linguistic diversity. Where such diversity is combined with few speakers and poor documentation, they are endangered language hot spots, for example northern Australia, central South America, eastern Siberia, the Pacific north-west of North America and the Himalayan belt including North-east India.
Map: World sketch marking these hot spots, with arrows showing Indo-European and Bantu migrations.
India's North-east, Andaman islands and tribal central India are such hot spots. Migration thus both diffuses languages and, through dominant newcomers, endangers local ones.
Q5(b) · Economic Geography · 10 marks≈ 7 min
Food Security, Nutrition and Famine
Define stunting and wasting. Why are these more prevalent among children in developing countries?
हिंदी में प्रश्न
बौनापन (स्टंटिंग) और शारीरिक क्षय (वेस्टिंग) को परिभाषित कीजिए। क्या कारण है कि ये विकासशील राष्ट्रों के बच्चों में अधिक विद्यमान हैं?
Practise this question Economic Geography notes
Model answer
Paper and question: Paper I, Q5(b)
Approach: Give WHO definitions of stunting and wasting, then explain the causes of their higher prevalence in developing countries with Indian data, and add a brief remedy line.
Stunting is low height for age, more than two standard deviations below the median of the WHO Child Growth Standards; it reflects chronic undernutrition and repeated infections. Wasting is low weight for height, below the same threshold; it reflects acute undernutrition from recent food shortage or illness. In India NFHS-5 (2019-21) recorded 35.5 per cent of under-five children stunted and 19.3 per cent wasted.
Causes of higher prevalence in developing countries: (i) poverty and food insecurity, with cereal-based diets low in protein and micronutrients; (ii) maternal undernutrition and anaemia, early marriage and low birth weight, which start the cycle in the womb; (iii) poor sanitation and unsafe water causing diarrhoea and enteric infections; (iv) inadequate breastfeeding and complementary feeding; (v) low female education and status; (vi) weak health services and immunisation gaps; (vii) conflict and climate shocks, as in the Sahel and Yemen.
Diagram: Intergenerational cycle: undernourished girl → undernourished mother → low-birth-weight baby → stunted child → undernourished adolescent girl.
Remedies include POSHAN Abhiyaan (2018), the first 1,000 days focus, Swachh Bharat and food fortification.
Q5(c) · Population Geography · 10 marks≈ 7 min
Growth, Distribution and Demographic Attributes of World Population
Explain the relationship between net reproductive rate (NRR) and true replacement level of population.
हिंदी में प्रश्न
जनसंख्या की निवल जनन दर (एन० आर० आर०) और जनसंख्या के वास्तविक प्रतिस्थापन स्तर के बीच संबंध को स्पष्ट कीजिए।
Practise this question Population Geography notes
Model answer
Paper and question: Paper I, Q5(c)
Approach: Define GRR, NRR and replacement level, explain why NRR of 1 marks true replacement and how it relates to TFR of about 2.1, and illustrate with examples.
The gross reproduction rate (GRR) is the average number of daughters a woman would bear in her lifetime at current age-specific fertility rates, assuming no mortality. The net reproduction rate (NRR) adjusts this for mortality: it is the average number of daughters a woman would have who survive to the mothers' ages, given current fertility and mortality.
Relationship: NRR measures whether a generation of mothers replaces itself. An NRR of 1 is the true replacement level: each woman is replaced by exactly one daughter, and in the long run the population becomes stationary. Above 1 it grows; below 1 it eventually declines.
Because about 105 boys are born for every 100 girls and some girls die before reproductive age, replacement requires a total fertility rate of about 2.1 in low-mortality countries, and higher (2.5 or more) where female mortality is high.
Diagram: Graph of NRR against time for a country, with a horizontal line at NRR = 1 marking replacement and a lag showing momentum.
Even after NRR falls below 1, population may grow for decades due to a young age structure (population momentum), as in India today.
Q5(d) · Regional Planning · 10 marks≈ 7 min
Concept of Region, Types of Regions and Regionalisation
What are natural regions? How are they different from planning regions?
हिंदी में प्रश्न
प्राकृतिक प्रदेश क्या हैं? आयोजना प्रदेशों से वे किस प्रकार भिन्न हैं?
Practise this question Regional Planning notes
Model answer
Paper and question: Paper I, Q5(d)
Approach: Define natural regions (Herbertson), give examples, define planning regions, and tabulate the differences in purpose, criteria, boundaries and permanence.
Natural regions are areas with a broad uniformity of physical conditions: relief, climate and natural vegetation. A.J. Herbertson (1905) divided the world into major natural regions, such as equatorial, monsoon, Mediterranean, tundra and hot desert regions; in India the Himalaya, the Great Plains, the Peninsular Plateau, the Thar and the coastal plains are natural regions.
Planning regions are units delimited for preparing and implementing development plans, combining resource base, nodality and administrative convenience, for example the Damodar Valley region, the NCR or agro-climatic zones.
Differences: (i) purpose: natural regions describe and explain physical patterns, planning regions serve development policy; (ii) criteria: natural regions use physical features only, planning regions use physical, economic, social and administrative criteria; (iii) boundaries: natural regions have transitional boundaries, planning regions have fixed administrative boundaries; (iv) permanence: natural regions are relatively permanent, planning regions change with policy; (v) scale: natural regions are often large, planning regions are designed for manageability.
Map: Outline map of India showing physiographic natural regions with the NCR and DVC planning regions superimposed.
Natural regions often form the base on which planning regions are built.
Q5(e) · Models, Theories and Laws in Human Geography · 10 marks≈ 7 min
Heartland and Rimland Theories; Boundaries and Frontiers
Discuss the genetic classification of boundaries suggested by Hartshorne.
हिंदी में प्रश्न
हार्टशोर्न द्वारा सुझाई गई सीमाओं के आनुवंशिक वर्गीकरण पर चर्चा कीजिए।
Practise this question Models, Theories and Laws in Human Geography notes
Model answer
Paper and question: Paper I, Q5(e)
Approach: Introduce Hartshorne's genetic classification (1936) and explain each type (antecedent, subsequent, superimposed, relict) with examples and a diagram.
Richard Hartshorne (1936) classified boundaries genetically, that is, by when they were drawn relative to the development of the cultural landscape (settlement and population) of the area. This genetic classification has four types.
(i) Antecedent boundaries were drawn before the area was densely settled, such as the 49th parallel between the USA and Canada, and the Malaysia-Indonesia boundary across Borneo. (ii) Subsequent boundaries were drawn after settlement and follow cultural divisions of language or religion, such as the boundary between Ireland and Northern Ireland or many European boundaries after 1919. (iii) Superimposed boundaries were imposed by outside powers on an existing cultural landscape, ignoring its divisions, such as the colonial boundaries of Africa and the Radcliffe Line (1947) that partitioned Punjab and Bengal. (iv) Relict boundaries have ceased to function but remain visible in the landscape, such as the former boundary between East and West Germany, or the Great Wall of China.
Diagram: Four small sketches showing a boundary drawn through empty land, along a cultural divide, cutting across a culture group, and a disused line.
The classification helps explain why superimposed boundaries generate the most conflict.

Question 6 (50 marks)

Q6(a) · Perspectives in Human Geography · 20 marks≈ 14 min
Languages, Religions, Cultural Regions and the Human Development Index
HDI has brought about a paradigm shift in the way people think about the development process. Critically examine the inherent limitations of HDI.
हिंदी में प्रश्न
मानव विकास सूचकांक (एच० डी० आइ०) ने विकास के प्रक्रम के बारे में लोगों की सोच में आमूल परिवर्तन लाया है। एच० डी० आइ० की अंतर्निहित परिसीमाओं का समालोचनात्मक परीक्षण कीजिए।
Practise this question Perspectives in Human Geography notes
Model answer
Paper and question: Paper I, Q6(a)
Approach: Show how the HDI shifted thinking from income growth to human capabilities, then critically examine its conceptual, methodological and data limitations, mention the corrective indices, and conclude.
The Human Development Index, introduced in UNDP's first Human Development Report (1990) by Mahbub ul Haq with Amartya Sen's capability approach as its base, combines life expectancy, education and income.
Paradigm shift: (i) it moved the measure of development from GDP growth to people's capabilities; (ii) it showed that income does not automatically produce well-being: Sri Lanka and Kerala achieved high life expectancy and literacy at low incomes, while some oil-rich states lagged; (iii) it made governments compete on health and education; (iv) it spawned national and state HDRs in India, starting with Madhya Pradesh (1995).
Limitations: (i) narrow scope: it ignores freedom, security, environment, gender power and participation, which Haq himself saw as part of development; (ii) averages hide inequality: national HDI masks gaps between regions, castes and genders; (iii) methodological issues: arbitrary goalposts and equal weights, substitutability among dimensions, and a log of income that undervalues poverty reduction in poor countries; (iv) the indicators are slow to change and data in developing countries are often outdated or imputed; (v) it is not comparable over time after method changes (1990, 2010); (vi) it ignores sustainability, so a high-consumption country can rank high despite huge carbon footprints.
Diagram: Bar diagram comparing India's HDI rank with its GNI per capita rank (HDR 2025) to show the gap between income and human development, with Sri Lanka as a contrast.
Responses: UNDP introduced the inequality-adjusted HDI, GDI and GII (2010), the Multidimensional Poverty Index (2010) and the planetary pressures-adjusted HDI (2020). India's NITI Aayog uses an MPI and the SDG India Index.
Thus the HDI changed how the world thinks about development, but it is a starting point, not a complete measure; it must be read with distributional, environmental and qualitative indicators.
Q6(b) · Economic Geography · 15 marks≈ 11 min
World Industries and Patterns of World Trade
"A large-scale global shift in manufacturing is the outcome of deindustrialization in the developed world matched by industrialization in the developing world." Analyze this statement.
हिंदी में प्रश्न
"विनिर्माण में बड़े पैमाने पर वैश्विक स्थानांतरण विकसित संसार में विउद्योगीकरण का परिणाम है जो विकासशील संसार में उद्योगीकरण के बराबर है।" इस कथन का विश्लेषण कीजिए।
Practise this question Economic Geography notes
Model answer
Paper and question: Paper I, Q6(b)
Approach: Explain the global shift (Dicken) and the new international division of labour, analyse deindustrialisation in developed countries and industrialisation in developing ones with causes and examples, then evaluate how far the statement holds.
Peter Dicken's Global Shift describes the large-scale relocation of manufacturing from North America, Western Europe and Japan to East and South-east Asia and other developing regions since the 1960s. Frobel, Heinrichs and Kreye (1980) called this the new international division of labour.
Deindustrialisation in the developed world: manufacturing's share of jobs fell sharply in the USA's Rust Belt (Detroit, Pittsburgh), Britain's Midlands and north, and Germany's Ruhr. Causes: high wages, rising productivity and automation, competition from cheaper producers, and a shift to services and finance.
Industrialisation in the developing world: first the Asian Tigers (South Korea, Taiwan, Hong Kong, Singapore), then China after 1978, which became the 'world's factory', and more recently Vietnam, Bangladesh, Mexico and India. Drivers: cheap labour, export processing zones, FDI by transnational corporations, falling transport and communication costs (containerisation), and liberal trade under the WTO.
Map: World map with arrows from the USA, Western Europe and Japan to China, South-east Asia, Mexico and India, and labels for Rust Belt, Ruhr, Pearl River Delta and Bangladesh garment belt.
Evaluation: the statement is broadly true, but the shift is uneven: most of sub-Saharan Africa has not industrialised, and some developing countries show premature deindustrialisation (Rodrik). High-value design, R&D and advanced manufacturing remain in developed countries (Germany, Japan), and reshoring and automation are partly reversing the trend. The global shift is thus a reorganisation of value chains rather than a simple transfer.
Q6(c) · Population Geography · 15 marks≈ 11 min
Migration: Causes and Consequences
What do you mean by 'climate migrants'? Suggest appropriate policies and programmes for their resettlement.
हिंदी में प्रश्न
'जलवायु प्रवासियों' से आप क्या समझते हैं? उनके पुनःस्थापन के लिए उचित नीतियाँ व कार्यक्रम सुझाइए।
Practise this question Population Geography notes
Model answer
Paper and question: Paper I, Q6(c)
Approach: Define climate migrants and their legal gap, give causes and examples (slow-onset and sudden-onset), then suggest policies and programmes for resettlement at national and international levels.
Climate migrants are people who move, temporarily or permanently, within or across borders, mainly because of sudden or gradual changes in climate that affect their lives and livelihoods. They are not 'refugees' under the 1951 Refugee Convention, so they lack international legal protection.
Drivers: sudden-onset events such as cyclones and floods (Cyclone Amphan, 2020; Pakistan floods, 2022) and slow-onset changes such as sea-level rise, salinisation, glacier retreat and desertification. The World Bank's Groundswell report (2021) projected that up to 216 million people could become internal climate migrants by 2050 without action. Examples include the Sundarbans islands (Ghoramara, Sagar), coastal Bangladesh, the Sahel, and atoll nations such as Tuvalu and Kiribati.
Map: World map of climate migration hotspots: Sundarbans and coastal Bangladesh, Sahel, Horn of Africa, Central America's Dry Corridor and Pacific atolls.
Policies and programmes: (i) a legal framework recognising climate displacement, building on the Nansen Initiative's protection agenda (2015) and the Global Compact for Safe, Orderly and Regular Migration (2018); (ii) planned relocation with community consent, as in Fiji's relocation guidelines, and labour-mobility pathways such as Australia's Falepili Union treaty with Tuvalu (2023); (iii) resettlement with land, housing, livelihoods and services; (iv) adaptation at source: embankments, mangrove belts, climate-resilient agriculture and early warning to reduce forced moves; (v) finance through the Loss and Damage Fund agreed at COP27 and operationalised at COP28.
Resettlement should be a last resort, rights-based and participatory, so that climate migration becomes adaptation rather than tragedy.

Question 7 (50 marks)

Q7(a) · Settlement Geography · 20 marks≈ 14 min
Urbanisation: Problems, Remedies and Sustainable Cities
What changes in the current planning, management and governance of human settlements are needed to face the changing environment including climate change and disaster vulnerabilities in cities?
हिंदी में प्रश्न
जलवायु परिवर्तन और शहरों में आपदा भेद्यताओं सहित परिवर्तनशील पर्यावरण का मुकाबला करने के लिए मानव बस्तियों की वर्तमान आयोजना, प्रबंधन और शासन में किन-किन परिवर्तनों की आवश्यकता है?
Practise this question Settlement Geography notes
Model answer
Paper and question: Paper I, Q7(a)
Approach: Explain the changing environment of cities (climate change, hazards, urban growth), then set out the changes needed in planning, management and governance under separate heads with Indian and global examples, and conclude.
Cities face a changing environment: rising temperatures and heatwaves, more intense rainfall and floods, sea-level rise on coasts, water stress, and growing exposure as populations crowd into hazard-prone areas. The IPCC's Sixth Assessment Report (2022) identified cities as hotspots of risk but also of solutions.
Changes in planning: (i) risk-informed land-use planning using hazard maps, with no-build zones on floodplains, wetlands and coastal regulation zones; (ii) blue-green infrastructure: restoring lakes, drains and mangroves, as in sponge-city models; (iii) compact, transit-oriented, mixed-use growth to cut emissions; (iv) climate-resilient building codes and cool roofs; (v) integrating slums through in-situ upgrading rather than eviction to unsafe peripheries.
Changes in management: early warning and real-time flood monitoring (Mumbai's IFLOWS, Chennai's flood warning system); heat action plans like Ahmedabad's; decentralised water harvesting and wastewater reuse; solid waste management that keeps drains clear; insurance and contingency funds; and regular disaster drills.
Changes in governance: empowering urban local bodies with funds, functions and staff as envisaged by the 74th Amendment; metropolitan planning committees to coordinate across municipal boundaries; disaster management authorities at city level; data and GIS platforms; citizen participation; and access to climate finance through municipal bonds and green funds.
Diagram: Three-pillar diagram (planning, management, governance) supporting a roof labelled 'resilient, low-carbon city', with key actions listed under each pillar.
Global examples include Rotterdam's water squares, Copenhagen's cloudburst plan and Tokyo's underground flood channels. With such reforms, Indian cities can move from reactive disaster response to proactive resilience, in line with SDG 11 and the Sendai Framework.
Q7(b) · Perspectives in Human Geography · 15 marks≈ 11 min
Languages, Religions, Cultural Regions and the Human Development Index
Globalization can often subsume folk culture. What are its positive and negative effects?
हिंदी में प्रश्न
वैश्वीकरण अकसर लोक संस्कृति को समाहित कर सकता है। इसके सकारात्मक व नकारात्मक प्रभाव क्या हैं?
Practise this question Perspectives in Human Geography notes
Model answer
Paper and question: Paper I, Q7(b)
Approach: Define folk culture and contrast it with popular culture, explain how globalisation subsumes it, then give positive and negative effects with examples and conclude with a balanced view.
Folk culture is traditionally practised by small, homogeneous, often rural groups living in relative isolation; it varies from place to place and diffuses slowly, mainly by relocation. Popular culture is found in large, heterogeneous societies and diffuses rapidly through media, a distinction stressed by Rubenstein. Globalisation spreads popular culture and can absorb or erase folk traits.
Positive effects: (i) global markets for folk products: Madhubani and Warli paintings, Channapatna toys and Kanjeevaram silk reach world buyers, aided by Geographical Indication tags; (ii) tourism and festivals such as Rajasthan's folk music circuits and the Hornbill Festival of Nagaland create incomes; (iii) digital media and diasporas revive interest in folk songs and crafts; (iv) exposure brings education, health and gender reforms to closed communities.
Negative effects: (i) cultural homogenisation: jeans, fast food and film music replace local dress, cuisine and performing arts; (ii) commodification turns rituals into staged shows; (iii) languages and oral knowledge decline as youth migrate; (iv) traditional sustainable practices, such as sacred groves and water harvesting systems, erode; (v) loss of identity can provoke backlash and identity politics.
Diagram: Two-column comparison of folk and popular culture (group size, diffusion, landscape, change), with an arrow labelled 'globalisation' showing transfer from one to the other.
Globalisation also produces 'glocalisation', where global forms adopt local flavours. Policies such as GI protection, UNESCO's 2003 Convention on Intangible Cultural Heritage and support to artisans can help folk culture adapt rather than vanish.
Q7(c) · Regional Planning · 15 marks≈ 11 min
Growth Centres and Growth Poles
"Growth is not uniform in different places." Critically examine this statement in the context of the growth pole theory.
हिंदी में प्रश्न
"विभिन्न स्थानों पर संवृद्धि एकसमान नहीं है।" इस कथन का वृद्धि ध्रुव थियोरी के परिप्रेक्ष्य में समालोचनात्मक परीक्षण कीजिए।
Practise this question Regional Planning notes
Model answer
Paper and question: Paper I, Q7(c)
Approach: Link the statement to Perroux's original proposition, explain why growth concentrates (propulsive industries, agglomeration, cumulative causation), then critically examine with Indian and world evidence whether growth spreads over time (Hirschman, Williamson) or remains uneven.
The statement echoes François Perroux (1955), who held that growth does not appear everywhere at once but at poles of growth, from which it spreads with varying intensity. Boudeville (1966) gave the idea geographical form as growth centres.
Why growth is uneven: propulsive industries locate where resources, markets and infrastructure exist; agglomeration economies attract further firms; and Myrdal's cumulative causation means advantage breeds advantage. In India, growth has concentrated in the western and southern states and in metropolitan corridors such as Delhi-NCR, Mumbai-Pune and Bengaluru-Chennai.
Evidence of spread: Hirschman (1958) expected trickle-down to eventually outweigh polarisation, and Williamson (1965) found regional inequality rising in early development and falling later, an inverted U. Western Europe and Japan show convergence; in India, satellite towns, Hosur near Bengaluru and the Pune-Aurangabad belt show some diffusion.
Diagram: Williamson's inverted-U curve of regional inequality against level of development, alongside a sketch of a pole with spread and backwash arrows.
Critical view: in many developing countries backwash has dominated, producing enclaves such as Bokaro amid tribal poverty; spread depends on infrastructure, human capital and policy. Growth is therefore uneven by nature, but the degree and duration of unevenness depend on deliberate regional policy.

Question 8 (50 marks)

Q8(a) · Models, Theories and Laws in Human Geography · 20 marks≈ 14 min
Von Thunen, Weber, Perroux-Boudeville and Rostow
Distinguish between 'isodapanes' and 'isotims'. Critically examine the least cost theory of industrial location given by Alfred Weber.
हिंदी में प्रश्न
'आइसोडापेन' व 'आइसोटिम' में विभेद कीजिए। अल्फ्रेड वेबर द्वारा दी गई औद्योगिक अवस्थिति की न्यूनतम लागत थियोरी का समालोचनात्मक परीक्षण कीजिए।
Practise this question Models, Theories and Laws in Human Geography notes
Model answer
Paper and question: Paper I, Q8(a)
Approach: First distinguish isotims and isodapanes with definitions and a diagram, then critically examine Weber's least-cost theory (assumptions, transport, labour, agglomeration, criticisms), with examples.
In Alfred Weber's theory (1909), an isotim is a line joining points of equal transport cost from a single source of raw material or from the market; isotims form concentric circles around each source. An isodapane is a line joining points of equal total transport cost, obtained by adding the isotim values of all materials and the product; isodapanes surround the least-cost point and show the additional transport cost of locating elsewhere. Isotims refer to one input, isodapanes to the total.
Least-cost theory: industry seeks the location that minimises total cost. Transport cost decides the primary location through the locational triangle and the material index: weight-losing industries such as iron and steel, cement and sugar locate near raw materials (Jamshedpur, Bhilai, sugar mills in Uttar Pradesh); weight-gaining or ubiquitous-material industries locate near markets. Labour cost can cause deviation to a cheap-labour site if savings exceed the extra transport cost, that is, if the site lies inside the critical isodapane. Agglomeration economies pull firms together where their critical isodapanes overlap.
Diagram: Two material sources and a market with concentric isotims around each, isodapanes drawn around the least-cost point P, the critical isodapane, and a labour location L lying inside it.
Critical examination: strengths are its clear, systematic logic, the useful material index and the explanation of raw-material oriented industries. Weaknesses: it assumes perfect competition, fixed markets and linear transport costs; it ignores demand, prices and revenue (Losch's maximum profit approach); it neglects government policy, capital, entrepreneurship and technology; and it is less relevant to footloose, high-tech and service industries, where transport costs are small. Later work, D.M. Smith's spatial margins of profitability (1966) and Isard's substitution analysis, made it more realistic.
Weber's theory therefore remains a foundation of industrial location analysis, valid for heavy, bulky industries but limited in the modern economy.
Q8(b) · Population Geography · 15 marks≈ 11 min
Population Problems, Policies, Well-being and Social Capital
Assess the challenges for countries with the largest shares of aged populations.
हिंदी में प्रश्न
वृद्ध आबादियों के सर्वाधिक बड़े अंशों वाले राष्ट्रों के लिए चुनौतियों का आकलन कीजिए।
Practise this question Population Geography notes
Model answer
Paper and question: Paper I, Q8(b)
Approach: Identify the countries with the largest shares of aged people, then assess the challenges under economic, fiscal, health, social and spatial heads with examples, and note responses.
The countries with the largest shares of people aged 65 and above are Japan (close to 30 per cent), Italy, Portugal, Finland, Greece and Germany (above 22 per cent), with South Korea and China ageing at unprecedented speed. They are at the late stage of the demographic transition.
Economic: shrinking labour force, labour shortages and slower growth; Japan's working-age population has been falling since the mid-1990s. Fiscal: rising pension and health spending against a narrowing tax base, a high old-age dependency ratio and heavy public debt.
Health and care: higher prevalence of chronic diseases and dementia, and a shortage of care workers, which Japan meets with robots and limited immigration and Germany with foreign nurses.
Social and spatial: loneliness, single-elderly households, pressure on family caregivers (mostly women), and depopulation of rural areas, such as Japan's 'marginal villages' and Italy's hill towns selling houses for one euro.
Diagram: Bar chart of the share of population aged 65 and above in Japan, Italy, Germany, South Korea, China and India (UN WPP 2024).
Responses include raising retirement ages, pension reform, pronatalist and childcare policies, immigration, automation and age-friendly cities. These countries' experience is a warning for fast-ageing middle-income countries such as China, Thailand and, later, India.
Q8(c) · Models, Theories and Laws in Human Geography · 15 marks≈ 11 min
Heartland and Rimland Theories; Boundaries and Frontiers
Examine the relevance of the 'rimland theory' in the contemporary world.
हिंदी में प्रश्न
समकालीन जगत् में 'रिमलैंड थियोरी' की प्रासंगिकता का परीक्षण कीजिए।
Practise this question Models, Theories and Laws in Human Geography notes
Model answer
Paper and question: Paper I, Q8(c)
Approach: Summarise Spykman's Rimland theory and its Cold War application, then examine its contemporary relevance (China's maritime rise, Indo-Pacific, West Asia, Eastern Europe, India) and limits.
Nicholas Spykman's The Geography of the Peace (1944) argued, against Mackinder, that the Rimland, the amphibious coastal belt of Eurasia between the Heartland and the marginal seas, holds most of the world's people, resources and industry, and that whoever controls it rules Eurasia and the world. The USA applied this through containment: NATO, CENTO, SEATO and alliances with Japan and South Korea.
Contemporary relevance: (i) China's rise is a Rimland phenomenon: its coast holds its industry, and its claims in the South China Sea, naval expansion and Belt and Road ports aim at controlling Rimland seas; (ii) the US 'Indo-Pacific' strategy, the Quad and AUKUS are modern containment along the rim; (iii) West Asia, the energy core of the Rimland, remains a theatre of rivalry; (iv) Eastern Europe and the Black Sea, where the Russia-Ukraine war is fought, form the meeting zone of Heartland and Rimland; (v) India, central to the southern Rimland and the Indian Ocean, is courted by all sides and pursues strategic autonomy through SAGAR and the Indo-Pacific Oceans Initiative.
Map: Eurasia with the Rimland shaded, and markers for NATO, the Quad partners, the South China Sea, the Strait of Hormuz and the Indian Ocean.
Limits: economic interdependence, nuclear deterrence, cyber and space domains, and non-state actors mean geography is not destiny; the Rimland is itself divided. Still, the theory explains why most flashpoints lie on Eurasia's rim and remains highly relevant.

UPSC Mains 2019 Geography Paper II