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  4. The first organisms which released oxygen in the environment by its photosynthesis were:

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Q. The first organisms which released oxygen in the environment by its photosynthesis were:

NTA AbhyasNTA Abhyas 2020Biological Classification

Solution:

Cyanobacteria or BGA are first photosynthetic organism on earth which stared production of oxygen in their photosynthesis, thus their photosynthesis is called as oxygenic photosynthesis. They had chlorophyll a similar to higher plants thus were capable of causing photolysis of water to release oxygen.