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 the world’s oxygen.

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Q: 117 (IAS/2025)
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 the world’s oxygen.

question_subject: 

Ecology

question_exam: 

IAS

Statement I is incorrect because rainforests do not produce more oxygen than oceans. The net contribution of rainforests to global oxygen levels is minimal due to the balance between oxygen production and consumption within the ecosystem. Statement II is correct as marine phytoplankton and photosynthetic bacteria are responsible for about 50% of the world's oxygen production.