Question

Is nostoc a free-living nitrogen fixer?

Answer 1

Free-living nitrogen fixer:

1. Many heterotrophic bacteria live in the soil and fix significant levels of nitrogen without direct interaction with other organisms.
2. Examples of such nitrogen-fixing bacteria include Bacillus, Azotobacter, Klebsiella, and Clostridium.
3. Yes, Nostoc is a free-living nitrogen fixer but it can also fix nitrogen that binds symbiotically to some plants such as Sycamore and Cycas.