UPSC Mains 2025 GS1 Q16 — Plate Tectonics
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)
Question Decoded — examiner's intent
- Directive verbs
- Discuss
- Scope keywords
- changes in shape and sizescontinents and ocean basinstectonic movementscrustal masses
- Implicit sub-parts
- Mechanism of tectonic movements (convection currents and plate boundaries) causing spatial redistribution.
- Specific processes of continental changes (rifting, accretion, and continental drift).
- Specific processes of oceanic changes (seafloor spreading, subduction, and the Wilson Cycle).
- Historical and future trajectory of global geography (Pangea to current to future supercontinents).
- Common pitfalls
- Focusing solely on Continental Drift Theory (Wegener) while ignoring modern Plate Tectonics.
- Failing to explain 'size' changes, such as how subduction reduces ocean size while spreading increases it.
- Neglecting the role of mantle convection as the driving force behind the crustal movements.
- Omitting diagrams of divergent and convergent boundaries which are essential for GS1 geography.
- Dimensions required
- GeomorphologicalChronological (Geological Time Scale)Spatial (Global distribution)Dynamic (Interplay of constructive and destructive forces)
- Marks allocation hint
Dedicate 50 words to the introduction of plate tectonics and mantle convection. Use 150 words to balance the discussion between continental transformation (rifting/accretion) and oceanic evolution (spreading/subduction), supported by diagrams. Use the final 50 words to conclude with the Wilson Cycle or the cyclical nature of supercontinents.
Unlock the full analysis for this question
You've seen the question and its examiner-intent decoding. Subscribers also get:
- 🔗 Similar Previous Year Questions — cross-year, cross-paper matches so you study the topic, not the question
- 📚 Source Map — verified citations from Laxmikanth, NCERT, PRS, Yojana, Economic Survey, Spectrum
- 🌱 How this topic is evolving — current-affairs bridge anchored to live TARS news clustering
- 🧭 Examiner's Pattern — how the topic has been framed across every year UPSC has tested it
- ✍️ Answer Skeleton — a structured outline (intro → body → conclusion) you can flesh out
- 🎯 AI evaluation — write your answer, get rubric-based scoring from gs-eval
Or browse 132+ free preview questions across all years and papers — the first 3 questions of every paper are unlocked.
Ready to practice?
Subscribers can attempt this question in 250 words and get an instant, rubric-based evaluation showing where they stand.
Subscribe to evaluate your answer →