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.