Multiple choice

A blue- green algae that has the tendency to fix nitrogen of the atmosphere is:

  1. Aulosira

  2. Anabaea

  3. Nostoc

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aulosira, Anabaena, and Nostoc are all blue-green algae (cyanobacteria) capable of atmospheric nitrogen fixation. They possess nitrogenase enzymes for this purpose. The question correctly identifies that all these genera have nitrogen-fixing capability. Note: 'Anabaea' appears to be a typo for 'Anabaena'.

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