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An organism used as biofertilizer for raising soyabean crop is
A
$Nostoc$
B
$Azotobacter$
C
$Azospirillum$
D
$Rhizobium$
Detailed Solution
Soyabean is a leguminous plant.
The roots of legumes form nodules by symbiotic association with the bacterium $Rhizobium$.
$Rhizobium$ fixes atmospheric nitrogen into organic forms in the nodules, which the plant uses as a nutrient; so it is used as the biofertiliser for legume crops.
$Azotobacter$ and $Azospirillum$ are free-living nitrogen fixers of the soil, and $Nostoc$ is a cyanobacterium used mainly in paddy fields.
Hence the biofertiliser used for raising a soyabean crop is $Rhizobium$.
The roots of legumes form nodules by symbiotic association with the bacterium $Rhizobium$.
$Rhizobium$ fixes atmospheric nitrogen into organic forms in the nodules, which the plant uses as a nutrient; so it is used as the biofertiliser for legume crops.
$Azotobacter$ and $Azospirillum$ are free-living nitrogen fixers of the soil, and $Nostoc$ is a cyanobacterium used mainly in paddy fields.
Hence the biofertiliser used for raising a soyabean crop is $Rhizobium$.