Which one of the following is autotrophic?

Clostridium

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Rhizobium

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Anabaena

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Azotobacter

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Solution

The correct option is C Anabaena
Anabaena is a cyanobacteria, so it is autotrophic. It is a nitrogen-fixing filamentous cyanobacterium that lives freely in most waters and moist habitats. It also occurs as a symbiont in Azolla (a water fern) and cycad roots. The filaments may be straight or coiled. The cells are moniliform. Heterocysts do not possess mucilage covering.

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