Question
Biology Question on Nutrition
Which of the following is a free living nitrogen fixing bacteria present in the soil?
A
Pseudomonas
B
Rhizobium
C
Azotobacter
D
Nitrosomonas
Answer
Azotobacter
Explanation
Solution
The genus Azotobacter comprises large, free living, Gram negative, obiigately aerobic, rod shaped bacteria which are capable for fixation of nitrogen non-symbiotically. Rhizobium is a symbiotic nitrogen fixing bacteria, Nitrosomonas is a nitrifying bacteria, while Pseudomonas sp. is denitrifying bacteria.