GS1 2017 Q14 15 marks 250 words Oceanography
UPSC Mains 2017 GS1 Q14 — Oceanography
Account for variations in oceanic salinity and discuss its multi-dimensional effects. (250 words)
Question Decoded — examiner's intent
- Directive verbs
- Account fordiscuss
- Scope keywords
- variations in oceanic salinitymulti-dimensional effects
- Implicit sub-parts
- Factors influencing salinity at the surface (latitudinal variation, evaporation vs. precipitation).
- Factors influencing salinity at depths and in enclosed seas (vertical distribution, halocline).
- Physical effects on ocean water properties (density, freezing point).
- Climatological and biological effects (conveyor belt, marine biodiversity).
- Common pitfalls
- Focusing only on surface factors and ignoring vertical salinity gradients (the Halocline).
- Missing the 'Account for' directive by listing factors without explaining 'how' they create variations.
- Neglecting the impact of inland drainage and meltwater in polar regions.
- Limiting 'effects' to just climate, ignoring economic (shipping) and biological (osmotic pressure) dimensions.
- Dimensions required
- Physical Geography (Density and Buoyancy)Climatological (Global Conveyor Belt/THC)Biological (Marine Osmoregulation)Economic (Ice-free ports and Navigation)Spatial/Latitudinal variation
- Marks allocation hint
Devote approximately 125 words to the 'Account for' section by categorizing factors into horizontal and vertical variations. Use the remaining 125 words to address 'multi-dimensional effects,' ensuring at least one paragraph each for physical, climatic, and biological impacts.
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