Which one of the following is regarded as a biofertilizer?
An association between pteridophytes and cyanobacteria Anabaena
An association between gymnosperms and Nostoc
An association between legume and Rhizobium
All of the above
A
An association between pteridophytes and cyanobacteria Anabaena
B
An association between legume and Rhizobium
C
An association between gymnosperms and Nostoc
D
All of the above
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Solution
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Cyanobacteria either free-living or symbiotic are considered as biofertilizer because they fix atmospheric nitrogen in term of nitrates and nitrites by a biological process like Rhizobium.
Blue-green algae belonging to a general Cyanobacteria genus, Nostoc or Anabaena fix atmospheric nitrogen and are used as inoculations for paddy crop grown both under upland and lowland conditions.
So, the correct answer is option D.
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