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

Q14

Give a geographical explanation of the distribution of off-shore oil reserves of the world. How are they different from the on-shore occurrences of oil reserves ? (Answer in 250 words) 15

हिंदी में प्रश्न पढ़ें

विश्व के अपतटीय तेल भंडारों के वितरण का भौगोलिक स्पष्टीकरण दीजिए । ये तटवर्ती तेल भंडारों से किस प्रकार भिन्न हैं ? (उत्तर 250 शब्दों में दीजिए) 15

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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' requires a geographical causation analysis for offshore distribution followed by systematic differentiation from onshore reserves. Structure: brief introduction defining offshore reserves → body paragraph on geographical factors (continental shelf geology, sedimentary basins, tectonic settings) → comparative analysis of offshore vs onshore (extraction technology, cost, environmental risk, reserve characteristics) → conclusion with energy security implications.

Key points expected

Continental shelf width and passive margin geology as primary determinants (Gulf of Mexico, North Sea, Persian Gulf)
Sedimentary basin formation in rift valleys and deltaic regions (Mumbai High, Krishna-Godavari basin)
Tectonic stability vs instability affecting reserve accessibility (transform faults, subduction zones)
Comparative analysis: offshore reserves require advanced drilling technology, higher capital investment, greater environmental risks but often larger field sizes
India-specific examples: Mumbai High, KG basin, R-series fields; contrast with onshore fields like Digboi, Cambay basin
Geological age differences: offshore reserves often younger (Cenozoic) vs older onshore (Mesozoic/Paleozoic)

Evaluation rubric

Dimension	Weight	Max marks	Excellent	Average	Poor
Demand-directive understanding	20%	3	Answer explicitly addresses both parts—geographical explanation of offshore distribution AND systematic differentiation from onshore—without conflating the two; demonstrates understanding that 'explain' requires causal mechanisms, not mere description	Covers both parts but treats them sequentially without integration; geographical explanation lacks causation, reads as description	Misses one part entirely or conflates offshore/onshore into undifferentiated discussion; treats question as purely descriptive
Content depth & accuracy	20%	3	Accurately links offshore distribution to specific geological processes (continental rifting, deltaic sedimentation, passive margin evolution); correctly identifies 3-4 distinct geographical controls; technical terms used precisely (e.g., 'source rock,' 'reservoir rock,' 'trap formation')	Mentions continental shelves and sedimentary basins but with vague causation; some geological inaccuracies or conflation of terms; covers 2 geographical factors superficially	Fundamental errors (e.g., confusing offshore with deep sea beyond shelves; attributing distribution solely to political boundaries); lacks any geological explanation
Structure & flow	20%	3	Clear tripartite structure: geographical explanation → systematic comparison → synthesis; effective transitions between offshore and onshore sections; maintains 250-word discipline with proportional allocation (~100 words each part)	Recognizable structure but comparison section weak or appended as afterthought; some paragraphing issues; word count slightly imbalanced	No discernible structure or logical progression; rambling or repetitive; severely imbalanced (e.g., 200 words on offshore, 20 on comparison)
Examples / case-law / data	20%	3	Minimum 3 precise geographical examples including at least one Indian case (Mumbai High/KG basin); examples illustrate specific geological points (e.g., Mumbai High as carbonate platform, KG basin as rift-drift succession); comparative data on reserve size or extraction depth mentioned	2 generic examples (North Sea, Persian Gulf) without Indian reference; or Indian examples mentioned without geographical specificity; no comparative data	No examples or only vague references ('Gulf countries,' 'some African nations'); examples factually wrong (e.g., locating Mumbai High in Bay of Bengal)
Conclusion & analytical edge	20%	3	Synthesizes geographical factors with contemporary relevance—energy security, blue economy, climate constraints on Arctic offshore; or identifies emerging frontier areas (ultra-deepwater, pre-salt basins); demonstrates forward-looking geographical insight	Generic conclusion restating main points without synthesis; or abrupt ending with no conclusion; mentions energy security but without geographical nuance	No conclusion; or irrelevant conclusion drifting to renewable energy transition without linking to offshore geography; factual errors in 'forward-looking' claims

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