Question

Which one of the following statements is correct?

(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 plants

(c) Cyanobacteria such as Anabaena and Nostoc are important mobilisers of phosphates and potassium for plant nutrition in soil

(d) At present it is not possible to grow maize without chemical fertilisers

Answer 1

Correct Option (a) Extensive use of chemical fertilisers may lead to eutrophication of nearby water bodies .

Explanation:

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