How do biofertilizers enrich the soil ?

Biofertilizers play a vital role to solve the problems of soil fertility and soil productivity.

1. Anabaena, a cyanobacterium increases the fertility, enriches soil with organic material and fixes nitrogen.

2. Rhizobium also fix atmospheric nitrogen as nitrates and nitrites and lives as a symbiont in the roots of leguminous plants.

3. Mycorrhizae formed by association of bacteria and roots of higher plants increase soil fertility.

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Three water samples namely river water, untreated sewage water and secondary effluent discharged from a sewage treatment plant were subjected to BOD test. The samples were labelled A, B and C; but the laboratory attendant did not note which was which. The BOD values of the three samples A, B and C were recorded as 20 mg / L, 8 mg / L, and 400 mg / L, respectively. Which sample of the water is most polluted ? Can you assign the correct label to each assuming the river water is relatively clean ?

Find out the name of the microbes from which Cyclosporin A (an immunosuppressive drug) and Statins (blood cholesterol lowering agents) are obtained.

Arrange the following in the decreasing order (most important first) of their importance, for the welfare of human society. Give reasons for your answer.

Biogas, Citric acid, Penicillin and Curd.

Find out the role of microbes in the following and discuss it with your teacher.

(a) Single cell protein (SCP) (b) Soil.

Microbes in Human Welfare

How do biofertilizers enrich the soil ?