Civil Services Examination · प्रश्न 20
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 photo-synthetic 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?
उत्तर देखें और व्याख्या
उत्तर: (B) II only
व्याख्या
Oceans (via phytoplankton/bacteria) produce roughly half of Earth's oxygen — more than rainforests; dissolved oxygen in water is actually far lower in concentration than in air.