A) Rhizobium
B) Azospirillum
C) Oscillatoria
D) Frankia
Correct Answer: B
Solution :
| [B] Azospirillum is a nitrogen fixing bacterium in paddy fields. It is very useful soil and root bacterium. It is an associative symbiotic \[{{N}_{2}}\]-fixing bacteria. When it is added to the soil, it multiplies in millions and can supply 20-40 Kg of nitrogen per hectare, per season. It also produces growth promoting substances like Indole Acetic Acid (IAA), gibberellins and promotes root proliferation. These substances improve the plant growth and yield. |
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