Biological Classification And System Of Classification Question 131
Question: Which one of the following bacteria has potential for nitrogen fixation
[MP PMT 1995; Bihar MDAT 1995]
Options:
A) Nitrosomonas
B) Nitrobacter
C) Nitrosococcus
D) Rhizobium
Show Answer
Answer:
Correct Answer: A
Solution:
Only Rhizobium can fix atmospheric nitrogen symbiotically in the root nodules of leguminous plants, mostly belonging to the family Fabaceae.
Nitrosomonas and Nitrosococcus are rod-shaped chemoautotrophic bacteria, that oxidize ammonia into nitrite.
Nitrobacter plays an important role in the nitrogen cycle by oxidizing nitrite into nitrate in the soil.
BETA
