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Q.

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

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a

Anabaena

b

Nostoc

c

Azotobacter

d

Pseudomonas

answer is D.

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Detailed Solution

Anabaena, Nostoc, Azotobater are nitrogen fixing bacteria. Pseudomonas is a type of bacteria (germ) that is found commonly in the environment, like in soil and in water.

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