Multiple choice

Organisms that fix nitrogen in aquatic habitats are

  1. diatoms

  2. protozoans

  3. desmids

  4. cyanobacteria
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Cyanobacteria, also known as blue-green algae, are the primary organisms responsible for nitrogen fixation in aquatic habitats. They possess specialized cells called heterocysts to convert atmospheric nitrogen into usable forms.

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