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Question

One of the free-living anaerobic nitrogen fixer is:


A

Azotobacter

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B

Beijerinckia

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C

Clostridium

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D

Rhizobium

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Solution

The correct option is C

Clostridium


Nitrogen fixers can be of two types - free-living and symbiotic. Free-living or non-symbiotic nitrogen fixers are the microorganisms that live freely or outside the plant cell. For example free-living non-photosynthetic aerobic nitrogen fixing bacteria are Azotobacter, Beijerinckia and Derxia. Free-living non-photosynthetic anaerobic nitrogen fixing bacteria include Clostridium. Symbiotic nitrogen fixers are microbes which are mutually associated with plants and fix atmospheric nitrogen within plant cell. Example of a nitrogen fixer is Rhizobium that fixes nitrogen in roots of leguminous plants.

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