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a
Anoxygenic without nitrogenase.
b
Anoxygenic with nitrogenase.
c
Oxygenic with nitrogenase.
d
Oxygenic without nitrogenase.
answer is C.
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Detailed Solution
Cyanobacteria is the only type of bacteria that undergoes oxygenic photosynthesis. It also contains heterocyst which contains the enzyme nitrogenase which helps in nitrogen fixation.