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Nitrogen Fixing Bacteria

Which one of ...

Question

Which one of the following is not a nitrogen-fixing organism ?

A

Anabaena

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B

Nostoc

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C

Azotobacter

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D

Pseudomonas

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Solution

The correct option is D Pseudomonas
Anabaena, Nostoc and Azolobacter help in nitrogen fixation. But Pseudomonas perform Denitrification which is the reduction of nitrates back into Nitrogen gas.
So, the correct option is 'Pseudomonas'

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