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What Are Gaseous Cycles

Which of the ...

Question

Which of the following is nitrogen fixing algae

A

Azolla, Anabaena , Azotobacter

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B

Nostoc, Anabaena, Oscillatoria

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C

Oscillatoria, Anabaena, Azolla

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D

Azolla, Nostoc, Oscillatoria

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Solution

The correct option is B Nostoc, Anabaena, Oscillatoria
Nostoc, Anabaena and Oscillatoria are all types of cyanobacteria and are involved in nitrogen fixation. Azolla also plays a role in nitrogen fixation, but is a fern. Azotobacter is a eubacteria.

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