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UPSC Civil ServicesPrelims2025General Studies Paper I
Question
QQ40. 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. Which of the statements given above is/are correct?
Options
- A I and II
- B II only
- C I and III
- D None of the above statements is correct
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Correct Answer
B II only
Model Answer
Answer: option B, as per UPSC's final answer key (Series A).