STANDARDBotany-Microbes in Human Welfare
STANDARD Botany Biofertilizers MCQ Question
Type: MCQ-conceptual-Medium-Class 12
The common nitrogen-fixer in paddy fields is
A
Frankia
B
Rhizobium
C
Azospirillum
D
Oscillatoria
Correct Answer
Option C
Detailed Explanation
Azospirillum is nitrogen fixing bacteria in paddy fields. It is an associative symbiotic N₂ fixing bacteria. When it is added to the soil it multiply in millions and can supply 20-40 kg of nitrogen per hectare per season. It also produces growth promoting substance like Indole Acetic acid, gibberellins and promotes root proliferation. It improve plant growth and yield.
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