Azotobacter
A) are the chief suppliers of fixed nitrogen in grasslands.
B) form symbiotic associations with algae.
C) have a very low respiratory rate.
D) are methanogens.
E) are the chief suppliers of fixed nitrogen in grasslands AND form symbiotic associations with algae.

Question

Quizplus · Accepted Answer

Azotobacter are free-living nitrogen-fixing bacteria that can be found in soil, particularly in grasslands. They are known to be the chief suppliers of fixed nitrogen in these ecosystems. Option B is incorrect as Azotobacter do not form symbiotic associations with algae. Option C is incorrect as Azotobacter have a high respiratory rate. Option D is incorrect as Azotobacter are not methanogens. Option E is partially correct, but not the best choice as Azotobacter do not form symbiotic associations with algae.