Question
Biology Question on Kingdom Monera
Which of the following is free-living, aerobic and non-photosynthetic nitrogen fixing bacterium?
A
Azospirillum
B
Nostoc
C
Azotobacter
D
Rhizobium
Answer
Azotobacter
Explanation
Solution
The atmospheric nitrogen is not available to plants. There are some nitrogen fixing bacteria which converts atmospheric nitrogen into ammonia which is readily available to plants. Anabaena is a free-living as well as symbiotic nitrogen fixing bacteria. Clostridium is a free-living, anaerobic nitrogen fixing bacteria. Azotobacter are free-living, aerobic, and non-photosynthetic nitrogen fixing bacteria. Rhizobium is non free living symbiotic nitrogen fixing bacteria.