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Question

Which of the following is autotrophic bacteria?

A
Azolla
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B
Azotobacter
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C
Nostoc
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D
Anabaena
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Solution

The correct option is B Azolla
Azolla forms a symbiotic relationship with a cyanobacteria that helps it fix nitrogen. Cyanobacteria are bacteria that are capable of carrying out photosynthesis. So, the correct option is 'Azolla'.

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