A) Oxygenic with nitrogenase
B) Oxygenic without nitrogenase
C) Non-oxygenic with nitrogenase
D) Non-oxygenic without nitrogenase
Correct Answer: A
Solution :
Cyanobacteria (Greek: Kyanos?dark blue and bakterion? a staff) is also known as blue green algae. It is a very important group of photosynthetic bacteria in the history of life on earth. The cyanobacteria fix atmospheric nitrogen through the help of enzyme nitrogenase and are oxygenic photosynthetic also.
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