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UPSC Prelims 2011 · World Geography · Oceans, Seas and Straits
In the context of ecosystem productivity, marine upwelling zones are important as they increase the marine productivity by bringing the
- decomposer microorganisms to the surface.
- nutrients to the surface.
- bottom-dwelling organisms to the surface.
- (a) 1 and 2
- (b) 2 only
- (c) 2 and 3
- (d) 3 only
Show the answer and explanation
Answer: (b) 2 only
Upwelling lifts nutrients to the surface.
Statement by statement
1. ✗ NO Upwelling isn’t valued for lifting decomposers.
2. ✓ YES It brings nutrient-rich deep water to the sunlit surface.
3. ✗ NO It doesn’t bring bottom-dwellers up.
Why the others are wrong
(a) Adds decomposers.
(c) Adds bottom-dwellers.
(d) Keeps only bottom-dwellers.
The trap
None.
🔒 Upwelling: Peru, California, Benguela, Somali coast → big fisheries.
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