Choose the correct answers from the alternatives given..
Cyanobacteria are

photoautotrophs

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photoheterotrophs

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chemoautotrophs

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chemoheterotrophs

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Solution

The correct option is A photoautotrophs
Cyanobacteria or the blue-green algae are aerobic photoautotrophs. They require only water, carbon dioxide, inorganic substances and most importantly light.
Hence, the correct answer is, 'photoautotrophs'.

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