Mineral Nutrition Question 53
53. Which of the following is a free living aerobic nonphotosynthetic nitrogen-fixer?
(a) Rhizobium
(b) Azotobacter
(c) Azospirillum
(d) Nostoc
Show Answer
Answer : b
Hints & Solution
(b) Rhizobium is a symbiotic nitrogen fixer. Azospirillum is a nitrogen fixing fungus and Nostoc is anaerobic.