Civil Services Examination · પ્રશ્ન 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?
જવાબ બતાવો અને સમજૂતી
જવાબ: (B) II only
સમજૂતી
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.