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biology

Which of the following is a non-symbiotic nitrogen fixing prokaryote?

A

Azotobacter

B

Clostridium

C

Beijerinckia

D

All of these

Answer

Two kinds of nitrogen-fixing bacteria are recognized. The first kind, the free-living (non-symbiotic) bacteria, includes the cyanobacteria (or blue-green algae), Anabaena and Nostoc and genera such as Azotobacter, Beijerinckia, and Clostridium
Thus, the correct answers is 'All of these.'

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