Which of the following statements is correct ?

Options

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

Answer

A

Explanation

Out of the following statement (a) is correct as eutrophication is caused by run off water from fertilised fields, sub-urban lawns, feed lots and detergents rich sewage. It is phenomenon of nutrient enrichment of a water body.