General Studies 2025 GS Paper I 15 marks 250 words Compulsory Discuss

Q16

Discuss how the changes in shape and sizes of continents and ocean basins of the planet take place due to tectonic movements of the crustal masses. (Answer in 250 words) 15

हिंदी में प्रश्न पढ़ें

चर्चा कीजिए कि ग्रह के महाद्वीपों और महासागरीय बेसिनों के आकार और माप (साइज) में, क्रस्टल द्रव्यमानों की टेक्टोनिक गतिविधियों के कारण, परिवर्तन कैसे होते हैं। (उत्तर 250 शब्दों में दीजिए) 15

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Directive word: Discuss

This question asks you to discuss. 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 'discuss' requires a comprehensive examination of how tectonic movements reshape continental and oceanic configurations, covering mechanisms, processes, and outcomes. Structure as: brief introduction defining tectonic movements → body covering plate tectonics theory, specific mechanisms (seafloor spreading, subduction, continental drift), and resulting changes → conclusion with contemporary relevance or future implications.

Key points expected

Explanation of plate tectonics theory and crustal plates (continental vs oceanic) as foundational framework
Mechanisms: seafloor spreading at mid-ocean ridges, subduction at trenches, continental collision, rifting
Specific outcomes: formation/destruction of ocean basins (Atlantic expansion, Pacific contraction), supercontinent cycle (Pangaea, Gondwana, future Amasia)
Indian context: Himalayan orogeny from India-Eurasia collision, Deccan Traps, Indian Ocean evolution
Time scales: distinction between Wilson cycle (hundreds of millions of years) and instantaneous changes (earthquakes, tsunamis)
Link to contemporary changes: East African Rift potential new ocean, Red Sea widening

Evaluation rubric

Dimension	Weight	Max marks	Excellent	Average	Poor
Demand-directive understanding	20%	3	Treats 'discuss' comprehensively by examining multiple dimensions—mechanisms, spatial patterns, temporal scales, and outcomes—rather than merely describing or listing processes; maintains focus on 'changes in shape and sizes' throughout	Partially addresses the directive with some discussion but drifts into pure description; covers mechanisms adequately but weakly links to actual changes in continental/oceanic dimensions	Misinterprets directive as 'describe' or 'list'; provides fragmented information without examining how tectonics causes dimensional changes; off-topic content on volcanism or earthquakes without connection to landform reshaping
Content depth & accuracy	20%	3	Demonstrates precise understanding of plate boundaries, convection currents, slab pull/slab push forces; accurately distinguishes constructive vs destructive margins; correctly identifies rates of change (cm/year); scientifically accurate on supercontinent cycle	Generally accurate on basic concepts but contains minor errors (confusing convergent/divergent boundaries, overstating rates); superficial treatment of mechanisms; omits key distinctions between continental and oceanic crust behavior	Major conceptual errors (confusing continental drift with plate tectonics, attributing changes solely to erosion); outdated theories presented as current; factually incorrect on specific formations or timeframes
Structure & flow	20%	3	Logical progression from theory → mechanisms → specific continental changes → specific ocean basin changes → synthesis; clear paragraphing with topic sentences; seamless transitions between spatial scales (global to regional)	Recognizable structure but uneven development—either front-loaded with theory or back-loaded with examples; some abrupt transitions; paragraphs functional but not optimally sequenced	Disorganized or stream-of-consciousness writing; no clear separation between mechanisms and outcomes; abrupt jumps between topics; missing introduction or conclusion; word limit mismanagement (excessive theory, inadequate application)
Examples / case-law / data	20%	3	Specific, geographically precise examples: Atlantic Ocean widening (2.5 cm/year at Mid-Atlantic Ridge), Pacific Ring of Fire contraction, India-Asia collision (50 million years, ongoing 5 cm/year convergence), East African Rift future ocean; includes quantitative data where relevant	Generic examples (Himalayas mentioned without specifics, 'Atlantic Ocean' without directional change); Indian examples present but underdeveloped; lacks temporal or spatial specificity; no quantitative anchoring	No examples or irrelevant examples (Marianas Trench without explaining subduction's role in Pacific shrinkage); purely hypothetical illustrations; examples contradict stated mechanisms; missing Indian context entirely
Conclusion & analytical edge	20%	3	Synthesizes toward predictive insight (future configurations: Amasia supercontinent, Atlantic-Pacific reversal); connects to human relevance (mineral resources at plate boundaries, seismic risk); or offers nuanced reflection on cyclical vs linear geological time	Functional summary restating main points without synthesis; generic statement on 'importance of studying tectonics'; no forward-looking or analytical element; safe but uninspired closing	Missing conclusion or abrupt ending; introduces entirely new information in conclusion; purely descriptive closing without any analytical elevation; contradictory to body content

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