Microbes in Human WelfareMedium

Question

Which one of the following statements is correct ?

Options

A.Extensive use of chemical fertilizers may lead to eutrophication of neardy water bodies
B.Both Azotobacter and Rhizobium fix atmospheric nitrogen in root nodules of plants
C.Cyanobacteria such as Anabaena and Nostoc are important mobilizers of phosphates and potassium for plant nutrition in soil
D.At present it is not possible to grow maize without chemical fertilized

Solution

Eutrophication is caused by run off water from fertilized field, sub-urban lawns, feed lots and detergent rich sewage. It is phenomenon of nutrient enrichment of a water body.

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