Maximum $O_{2}$ evolution occurs from

Forests

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Marine phytoplankton

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Crops

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Land mass.

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Solution

The correct option is B Marine phytoplankton
Most of this oxygen comes from tiny ocean plants – called phytoplankton – that live near the water’s surface and drift with the currents. Like all plants, they photosynthesize – that is, they use sunlight and carbon dioxide to make food. A byproduct of photosynthesis is oxygen.
Scientists believe that phytoplankton contributes between 50 to 85 per cent of the oxygen in Earth’s atmosphere.
So the correct option is 'Marine phytoplankton'.

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Maximum O2 evolution occurs from

Maximum $O_{2}$ evolution occurs from