First slide

Microbes as Biofertilisers

Question

Which of the following pair of organisms can increase the nitrogen content of the soil?

Easy

A

Trichoderma and Anabaena
B

Yeast and Penicilium
C

Glomus and Nostoc
D

Azospirillum and Azotobacter

Solution

Bacteria can fix atmospheric nitrogen while free-living in the soil (examples Azospirillum and Azotobacter), thus enriching the nitrogen content of the soil. Glomus is the fungal symbiont in mycorrhizal associations that absorbs phosphorus from soil and passes it to the plant. Trichoderma is mostly used as a biocontrol agent and not a biofertilizer.

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