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Q.
Which of the following is the pair of biofertilizers
AIPMTAIPMT 2001Microbes in Human Welfare
Solution:
The term biofertilizers refer to the substance containing living or dried powder of microorganisms, it may be used to include all organic resources (manure) for plant growth which are rendered in an available form for plant absorption through microorganisms or plant associations or interactions. Biofertilizers are three types, nitrogen fixing bacteria, nitrogen-fixing cyanobacteria and mycorrhiza e.g., Rhizobium, Azotobacter, Azolla, Nostoc, Azospirilium and blue-green algae have been in use a long time.