Geography 2023 Paper I 50 marks Explain

Q4

(a) Give an account of marine resources and their economic significance. How has marine pollution affected such resources? (20 marks) (b) Differentiate between the characteristics of organic horizons and mineral horizons in a generalised soil profile. (15 marks) (c) How does inversion of temperature occur? Explain its significance on local weather with suitable examples. (15 marks)

हिंदी में प्रश्न पढ़ें

(a) सागरीय संसाधनों तथा उनके आर्थिक महत्व का एक विवरण दीजिए । इस प्रकार के संसाधनों को समुद्री प्रदूषण ने कैसे प्रभावित किया है ? (20 अंक) (b) एक सामान्य मृदा परिछेदिका में जैव क्षितिजों एवं खनिज क्षितिजों की विशेषताओं के मध्य अंतर स्थापित कीजिए । (15 अंक) (c) ताप व्युत्क्रमण कैसे होता है ? समुचित उदाहरणों द्वारा स्थानीय मौसम पर इसके महत्व का वर्णन कीजिये । (15 अंक)

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Directive word: Explain

This question asks you to explain. The directive word signals the depth of analysis expected, the structure of your answer, and the weight of evidence you must bring.

See our UPSC directive words guide for a full breakdown of how to respond to each command word.

How this answer will be evaluated

Approach

The directive 'explain' demands clear causal reasoning and elaboration of processes. For part (a), allocate ~40% words covering biotic (fisheries, seaweed) and abiotic (oil, gas, minerals) marine resources with economic data, followed by pollution impacts; for (b), spend ~30% on a labelled soil profile diagram contrasting O/A horizons' organic content, colour, structure against B/C horizons' mineral dominance; for (c), use remaining ~30% to explain radiation, subsidence, and advection inversions with Indian examples like Punjab winter fog and Delhi's urban heat island, linking to weather consequences.

Key points expected

  • Part (a): Classification of marine resources into biotic (fisheries, plankton, seaweed) and abiotic (petroleum, natural gas, polymetallic nodules, sand, salt) with their contribution to GDP and employment
  • Part (a): Economic significance including food security, trade balance, coastal livelihoods, and blue economy potential; specific impacts of oil spills, plastic pollution, eutrophication, and heavy metal contamination on these resources
  • Part (b): Clear differentiation of organic horizons (O and A) showing humus accumulation, dark colour, loose structure, biological activity versus mineral horizons (B and C) showing illuviation, lighter colours, compact structure, parent material characteristics
  • Part (b): Labelled diagram of soil profile showing horizon sequence and depth relationships; mention of eluviation-illuviation processes linking horizon development
  • Part (c): Mechanisms of temperature inversion: radiation inversion (clear winter nights), subsidence inversion (anticyclonic conditions), advection inversion (warm air over cold surface), and frontal inversion
  • Part (c): Weather significance including fog formation, frost damage, air pollution trapping, and smog episodes; Indian examples such as Indo-Gangetic winter fog, Delhi's November smog, and coastal advection inversions
  • Integrated conclusion connecting sustainable marine resource management, soil conservation, and pollution control as interconnected environmental challenges requiring spatial planning

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Precise definitions across all parts: for (a) correctly identifies EEZ provisions and UNCLOS categories of resources; for (b) accurately describes horizon nomenclature (O, A, E, B, C, R) and pedogenic processes; for (c) scientifically explains lapse rate reversal, stability conditions, and distinguishes four inversion types with correct thermal dynamicsBasic definitions present but conflates concepts: mixes marine resource categories, confuses A horizon with B horizon functions, or describes inversion as merely 'cold air below' without lapse rate explanationFundamental errors: treats all marine resources as fisheries only, reverses horizon characteristics (claims B horizon is organic), or describes temperature inversion as 'temperature increasing with height' without mechanism
Map / diagram15%7.5Two quality diagrams: for (b) a clearly labelled soil profile showing horizon depths, colour variations, and transition zones; for (c) a temperature-height graph showing normal lapse rate versus inversion conditions with annotated examples; optional map for (a) showing major Indian fishing zones and oil/gas blocksOne adequate diagram (typically soil profile) with basic labelling but missing depth markers or horizon boundaries; or describes diagrams in text without visual representationNo diagrams despite explicit need for soil profile illustration; or sketches with serious errors like inverted horizon sequence or temperature graphs showing decrease with height labelled as inversion
Indian regional examples20%10Rich Indian specificity: for (a) mentions Mumbai High oil, Mannar Basin, polymetallic nodules in Central Indian Ocean Basin, and pollution cases like Chennai oil spill or Ennore plastic dumping; for (b) cites Indian soil orders (allisols, vertisols) with regional horizon variations; for (c) details Punjab-Haryana radiation fog, Delhi's November smog, or Western Ghats valley inversionsGeneric Indian references: mentions 'Indian fisheries' without zones, 'black soils' without horizon specifics, or 'North Indian fog' without process linkage; examples stated but not integrated with explanationEntirely foreign examples (North Sea oil, podzols of Canada, London smog) or no examples at all; demonstrates unfamiliarity with Indian geographical conditions
Spatial analysis20%10Demonstrates spatial reasoning: for (a) explains latitudinal zonality of fisheries (equatorial upwelling vs temperate), bathymetric zoning of resources; for (b) relates horizon development to climate-topography interactions; for (c) analyses topographic controls on inversion (valley bottoms, basins) and spatial patterns of pollution trappingLists spatial facts without analytical linkage: mentions 'coastal areas have more fisheries' or 'mountains have different soils' without explaining why; describes where inversions occur without topographic or synoptic explanationNo spatial dimension: treats resources, soils, or weather as placeless phenomena; fails to recognise that soil horizons vary spatially or that inversions have distinct geographical distributions
Application / policy20%10Policy-relevant conclusions: for (a) evaluates Sagarmala, Blue Economy Policy, Marine Protected Areas, and pollution control through IMO conventions; for (b) connects horizon knowledge to soil health cards, precision agriculture; for (c) assesses fog forecasting for aviation, pollution mitigation strategies, and urban planning responses to urban heat islandsMentions policies by name without evaluation: lists 'Sagarmala' or 'National Soil Policy' without linking to specific resource/horizon/inversion management; or provides generic sustainable development conclusionNo policy or application dimension: purely academic treatment with no recognition of management implications; or irrelevant policy discussion (unrelated schemes like MGNREGA without marine/soil/weather linkage)

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