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Which of the following is a free living nitrogen fixing bacterium present in the soil?

a)

Nitrosomonas

b)

Rhizobium

c)

Azotobacter

d)

Pseudomanas



Question ID - 20 | SaraNextGen Top Answer

Which of the following is a free living nitrogen fixing bacterium present in the soil?

a)

Nitrosomonas

b)

Rhizobium

c)

Azotobacter

d)

Pseudomanas

1 Answer
127 votes
Answer Key / Explanation : (c) -

(c) 

The genus-Azotobacter  comprises large, free-living, Gram negative, obligately aerobic, rod-shaped bacteria which are capable of fixation of nitrogen non-symbiotically.

Rhizobium is a symbiotic nitrogen fixing bacteria, Nitrosomonas  is a nitrifying bacteria, while Pseudomanas  sp. is denitrifying bacteria.

127 votes


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