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Question

Which one is concerned the most active and efficient nitrogen fixer ?
  1. Anabaena
  2. Nostoc
  3. Aulosira
  4. Trichodesmium

A
Nostoc
B
Trichodesmium
C
Anabaena
D
Aulosira
Solution
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Many free-living cyanobacteria perform the function of nitrogen fixation. Examples of nitrogen fixer include Anabaena, Nostoc, Aulosira and Trichodesmium. Out of all these, Aulosira fertilissima is the most active and efficient nitrogen fixer of rice field.
Thus, the correct answer is option C.

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