UPSC • Prelims • 2025 • Prelims GS Paper I
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Official Final Answer Key — Series A, 2025 1 questions
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Question 40
UPSCEnvironment2025Prelims GS Paper ISeries A
With reference to the planet Earth, consider the following statements:
I. Rain forests produce more oxygen than that produced by oceans.
II. Marine phytoplankton and photosynthetic bacteria produce about 50% of world's oxygen.
III. Well-oxygenated surface water contains several folds higher oxygen than that in atmospheric air.
पृथ्वी ग्रह के संदर्भ में, निम्नलिखित कथनों पर विचार कीजिए : I. वर्षा वन, महासागरों द्वारा उत्पादित ऑक्सीजन की तुलना में अधिक ऑक्सीजन उत्पादित करते हैं। II. समुद्री पादप-प्लवक और प्रकाश-संश्लेषी जीवाणु विश्व की लगभग 50% ऑक्सीजन पैदा करते हैं। III. सुवातित पृष्ठीय जल में वायुमंडलीय वायु की तुलना में कई गुना अधिक ऑक्सीजन होती है।
Official Final Answer Key — Series A, 2025
Question 1 of 1
Author / EditorGoldej Kumar
Goldej Kumar is the Founder and Editor of Sri Ram Exams (Exam2.in), an independent educational platform for UPSC, State Public Service Commission, SSC and other competitive examinations. His editorial focus is on exam-relevant current affairs, source-based analysis, MCQ reasoning, previous-year-question patterns and clear bilingual learning for English- and Hindi-medium aspirants.