Which algae is responsible for main supply of oxygen in the atmosphere? green algae brown algae red algae blue algae

Green algae is the right and the correct answer.

The Green algae is responsible for main supply of oxygen in the atmosphere. There are tiny organisms called as cyanobacteria (or blue-green algae) which photosynthesise carbohydrates for their nutrition and growth using sunlight, water, and carbon dioxide. The waste product of cyanobacteria is the oxygen of atmosphere.

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