Which of the following is/are incorrect statements? I. Anabaena and Nostoc are not capable of fi...

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Which of the following is/are incorrect statements?
I. Anabaena and Nostoc are not capable of fixing nitrogen in free-living state.
II. Phosphorus is a constituent of cell membranes, certain nucleic acid and cell proteins.
III. Root nodule forming nitrogen fixers live as aerobes under free-living conditions.
IV. Nitrosomonas and Nitrobacter are chemoautotrophs.
Choose the correct option.
(a) I and II
(b) I and III
(c) II and IV
(d) None of these
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