उपर्युक्त परिच्छेद के आधार पर निम्नलिखित पूर्वधारणाएँ बनाई गई हैं :
- 1.भूमंडलीय तापन के कारण अन्य क्षेत्रों की अपेक्षा हिमनदों के क्षेत्र तेजी से गर्म होते हैं ।
- 2.भूमंडलीय तापन के परिणामस्वरूप कुछ क्षेत्रों में समुद्र अधस्तलीय अवसादन हो सकता है ।
- 3.पिघलते हुए हिमनद कुछ क्षेत्रों में समुद्री जैव-विविधता को कम कर सकते हैं ।
उपर्युक्त में से कौन-सी पूर्वधारणा/पूर्वधारणाएँ वैध है/हैं ?
Read this question in English
On the basis of the above passage, the following assumptions have been made:
1. Regions of glaciers warm faster than other regions due to global warming.
2. Global warming can lead to seafloor sedimentation in some areas.
3. Melting glaciers can reduce marine biodiversity in some areas.
Which of the above assumptions is/are valid?
(a) 1 and 2 only · (b) 3 only · (c) 2 and 3 only · (d) 1, 2 and 3
उत्तर और व्याख्या · explanation in English
Answer: (c) केवल 2 और 3
Warming melts glaciers, meltwater raises suspended sediment in coastal water, and that sediment cuts seafloor biodiversity. This supports statements 2 and 3, both hedged with 'can' and 'some areas'. The fast warming is reported for one peninsula, not for glacier regions in general.
- ✗ 1. Only the Western Antarctic Peninsula is said to have warmed five times as fast; extending this to all glacier regions overreaches.
- ✓ 2. Warming melts glaciers, raising 'suspended sediment in water' over the seafloor ecosystem; 'can' and 'some areas' keep the claim modest.
- ✓ 3. Melting glaciers 'are causing a loss of species diversity among benthos' in the coastal waters.
Remember · Data from one region cannot support a rule for all such regions; 'can … in some areas' is usually the safe claim.
Question and answer: UPSC's official GS Paper II (2019, Series A) — paper ↗ · answer key ↗. Explanation: Minimalist IAS, checked 30 Sept 2026 (how we verify). ·