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Solution


Q.

Which of following organisms cannot fix nitrogen

A.   Azotobacter

B.   Oscillatoria

C.   Anabaena

D.   Volvox

E.   Nostoc

Choose the correct answer from the options given below:                      [2025]
1 A only  
2 D only  
3 B only  
4 E only  

Ans.

(2)

Azotobacter, Oscillatoria, Anabaena and Nostoc can fix nitrogen but Volvox cannot fix nitrogen.