Anaerobic photosynthetic bacteria appeared on the earth about

500 million years ago

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1500 million years ago

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2500 million years ago

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3500 million years ago

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Solution

The correct option is D 3500 million years ago
Evolution of life occurred 3800-4200 million years ago. Evolution of bacteria occurred 3300-3500 million years before. Evolution of eukaryotic algae occured 1600 million years ago. So, anaerobic photosynthetic bacteria appeared on the earth about 3500 million years ago because, in that time only cyanobacteria which is the photosynthetic bacteria evolved.
Therefore, the correct answer is option D.

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