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Microbes In Human Welfare

Question
CBSEENBI12002563
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The common nitrogen -fixer in paddy field is 

  • Rhizobium

  • Azopirillum

  • Oscillatoria

  • Frankia

Solution

B.

Azopirillum

Azopirillum is a nitrogen-fixing bacterium in paddy fields. It is very useful soil and root bacterium. It is an associative symbiotic N2 -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 substance like Indole Acetic acid (IAA). Gibberellins and promotes root proliferation. These substances improve the plant growth and yield.

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