Mineral Nutrition Question 45

45. One of the free -living, anaerobic nitrogen fixer is:

[2010]

(a) Beijernickia

(b) Rhodospirillum

(c) Rhizobium

(d) Azotobacter

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Answer : b

Hints & Solution

(b) Rhodospirillum is a free-living, anaerobic nitrogen fixer bacteria. It can synthesize its food in presence of light under anaerobic conditions. Beijernickia and Azotobacter are free living aerobic nitrogen fixing bacteria. Rhizobium is a symbiotic nitrogen fixing bacteria.