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Which cyanobacterium is a free-living nitrogen fixer?

AAmoebaena
BAlternaria
CAspergillus
DAnabaena
Answer & Solution
Correct answer: D. Anabaena
1. Nostoc is named beside it. 2. Both are cyanobacteria. 3. It is Anabaena. _Source: syllabus Biology, Ch 12 'Mineral Nutrition'_
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