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Nine-tenth of all photosynthesis of world (85-90%) is carried out by:

1. large trees with millions of branches and leaves
2. algae of the ocean
3. chlorophyll containing ferns of the forest
4. scientists in the laboratories

Correct answer: algae of the ocean

Solution

Most of the planet’s photosynthesis happens in the oceans because microscopic and other algae are extremely abundant and cover vast areas. They collectively contribute the majority of global oxygen production and carbon fixation.

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