Geography 2023 Paper I 50 marks Elucidate

Q2

(a) "Evidences from palaeomagnetism and sea floor spreading have validated that continents and ocean basins have never been stationary." Elucidate with suitable diagrams. (20 marks) (b) Explain the characteristics and weather conditions associated with 'Anticyclones' giving suitable examples. (15 marks) (c) How are ocean currents generated? Discuss their effects on coastal climates with special reference to the Pacific Ocean. (15 marks)

हिंदी में प्रश्न पढ़ें

(a) "पुराचुम्बकत्व एवं समुद्र अधस्तल प्रसरण के साक्ष्यों ने प्रमाणित किया है कि महाद्वीप एवं महासागर द्रोणी कभी स्थिर नहीं रहे ।" समुचित रेखाचित्रों द्वारा व्याख्या कीजिये । (20 अंक) (b) समुचित उदाहरणों को देते हुए "प्रति चक्रवात" की विशेषताओं और मौसम की स्थितियों को स्पष्ट कीजिये । (15 अंक) (c) महासागरीय धारायें कैसे उत्पन्न होती हैं ? प्रशान्त महासागर के विशेष संदर्भ में तृतीय जलवायु पर उनके प्रभावों की चर्चा कीजिये । (15 अंक)

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Directive word: Elucidate

This question asks you to elucidate. 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 'elucidate' in part (a) demands clear explanation with diagrams, while parts (b) and (c) require 'explain' and 'discuss' respectively. Allocate approximately 40% of time/words to part (a) given its 20 marks, with ~30% each to parts (b) and (c). Structure: brief introduction on dynamic Earth → detailed body addressing each sub-part sequentially with diagrams for (a), examples for (b), and Pacific-specific analysis for (c) → concluding synthesis on interconnected geophysical processes.

Key points expected

Part (a): Apparent polar wandering paths, magnetic reversals recorded in oceanic basalts, Vine-Matthews-Morley hypothesis, and symmetrical magnetic stripes on either side of mid-oceanic ridges as evidence for continental drift and seafloor spreading
Part (a): Age progression of oceanic crust from ridge to trench, and calculation of spreading rates using magnetic anomaly patterns
Part (b): Anticyclone formation in subtropical high-pressure belts and polar regions, subsidence and divergence causing clear skies, temperature inversions, and seasonal weather impacts (e.g., summer heatwaves, winter fog/frost)
Part (c): Primary driving mechanisms—wind stress (Ekman transport), thermohaline circulation, Coriolis effect, and continental deflection; distinction between warm and cold currents
Part (c): Pacific Ocean examples—Kuroshio Current warming Japan, California Current causing coastal deserts, Peru/Humboldt Current enabling upwelling and El Niño impacts on coastal climates

Evaluation rubric

Dimension	Weight	Max marks	Excellent	Average	Poor
Concept correctness	25%	12.5	Precisely explains palaeomagnetic evidence (remanent magnetism, inclination/declination), seafloor spreading mechanics, anticyclone dynamics (subsidence, divergence, stability), and ocean current generation (wind-driven vs. thermohaline); correctly distinguishes between geostrophic and Ekman currents; accurately describes El Niño-Southern Oscillation linkages	Basic understanding of magnetic reversals and seafloor spreading but confuses anticyclone with cyclone dynamics; oversimplifies current generation as 'winds push water' without Coriolis or density considerations; minor errors in explaining pressure gradient forces	Fundamental misconceptions such as stating continents drift through oceanic crust rather than with it; describes anticyclones as storm systems; conflates warm and cold current effects; fails to distinguish between surface and deep ocean circulation
Map / diagram	20%	10	Draws clear, labelled diagrams for part (a) showing: (i) apparent polar wandering curves for different continents, (ii) magnetic reversal pattern symmetric about mid-ocean ridge with age dating; includes cross-section of oceanic crust showing basaltic layer 2A; sketches anticyclone wind circulation in both hemispheres; maps Pacific current system with directional arrows	Draws basic mid-ocean ridge with magnetic stripes but lacks age annotations or scale; simple anticyclone sketch showing clockwise/anticlockwise rotation without vertical structure; rough Pacific current map missing key currents or with incorrect directions	No diagrams for part (a) despite explicit requirement; poorly drawn or unlabelled sketches; diagrams contradict text (e.g., showing cyclonic circulation for anticyclones); omits directional arrows on current maps
Indian regional examples	15%	7.5	Links anticyclones to Indian conditions: winter subtropical high causing clear skies and radiation fog in northwest India, summer heat dome over Thar; connects monsoon breaks to Mascarene High; references Indian Ocean Dipole effects; cites specific instances like January 2023 cold wave or 2015 heatwave from persistent anticyclonic conditions	Mentions 'high pressure over Rajasthan' without specifying anticyclonic mechanism; general reference to 'winter fog in Delhi' without explaining subsidence inversion; vague connection between monsoon and 'pressure systems'	No Indian examples provided; or incorrectly applies examples (e.g., describing monsoon depressions as anticyclones); confuses Indian Ocean gyre with Atlantic/Pacific patterns; fails to relate global concepts to subcontinental conditions
Spatial analysis	20%	10	Demonstrates spatial reasoning: explains why magnetic anomaly symmetry proves lateral spreading; analyzes latitudinal variation in anticyclone intensity (stronger subtropical highs in winter); compares coastal climate effects of eastern vs. western boundary currents in Pacific; discusses spatial extent of upwelling zones and their climatic footprints	Describes spatial patterns without explaining causation (e.g., notes currents flow north but not why); lists locations of anticyclones without analyzing their seasonal migration; mentions coastal deserts without comparing Peru vs. Namibia spatially	No spatial analysis; treats all locations as interchangeable; fails to distinguish between equatorial, mid-latitude, and polar anticyclones; ignores zonal asymmetry in Pacific current systems; no sense of scale or geographic variation
Application / policy	20%	10	Connects to practical implications: palaeomagnetism for mineral exploration (magnetic surveys for ore deposits); anticyclone forecasting for agriculture (frost protection, irrigation scheduling) and air quality management (stagnation episodes); ocean current applications for fisheries management (Peruvian anchovy), shipping routes (Great Circle vs. current-assisted paths), and climate adaptation (ENSO prediction for Indian monsoon planning)	Brief mention of 'useful for navigation' or 'helps predict weather' without specificity; generic reference to 'fishing industry benefits' without naming Peru or explaining mechanism; superficial connection to climate change without elaboration	No application or policy relevance discussed; or completely irrelevant connections (e.g., suggesting anticyclones cause earthquakes); misapplies concepts (e.g., claiming seafloor spreading predicts volcanic eruptions on land)

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