Attempt this previous-year question. The correct option stays hidden until you choose.
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?
Pick an option to check yourself.
• Correct Answer: B
• Marine phytoplankton and photosynthetic bacteria produce at least 50% of global oxygen via photosynthesis.
• Rainforests produce only ~6-9% of world oxygen and consume most of it locally.
• Atmospheric air has ~21% oxygen; well-oxygenated surface water has only ~6-10 mg/L.
Attempt Prelims MCQs or open Mains questions by paper — then continue the same bank inside the app with visual decks.
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