Prelims GS July 18, 2025

With reference to the planet Earth, consider the following statements:

    1. Rain forests produce more oxygen than that produced by oceans.
    2. Marine phytoplankton and photo-synthetic bacteria produce about 50% of world's oxygen.
    3. Well-oxygenated surface water contains several folds higher oxygen than that in atmospheric air.

Which of the statements given above is/are correct?