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?
Oxygen on Earth mainly comes from photosynthesis, especially by phytoplankton (marine organisms), and oxygen levels differ between air and water. ❌ Statement I is incorrect:
* Oceans (phytoplankton) produce more oxygen than rainforests. ✅ Statement II is correct:
* Marine phytoplankton and photosynthetic bacteria produce about 50% of the world’s oxygen. ❌ Statement III is incorrect:
* Atmospheric air has much more oxygen than surface water; water does not contain several folds higher oxygen than air. So, the correct answer is: B