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  4. Which of the following cyanobacteria can fix atmospheric nitrogen ? I. Nostoc II. Anabaena III. Oscillatoria IV. None of these

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Q. Which of the following cyanobacteria can fix atmospheric nitrogen ? I. Nostoc
II. Anabaena
III. Oscillatoria
IV. None of these

Microbes in Human Welfare

Solution:

Correct answer is (d) I, II, III