Multiple choice

Example of non symbiotic is

  1. Azolla

  2. Rhizobium

  3. BGA

  4. Bradyrahzobium

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

While Rhizobium and Bradyrhizobium are obligate symbiotic nitrogen fixers, and Azolla forms an obligate symbiosis with Anabaena, many Blue-Green Algae (BGA) can fix nitrogen in a free-living, non-symbiotic state.