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Which one of the following statements is correct?

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

Solution & Step-by-step Explanation

Excess nitrogen and phosphorus from chemical fertilizers can be washed into water bodies (leaching/runoff), leading to nutrient enrichment or eutrophication, which causes algal blooms and oxygen depletion.

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Which one of the following statements is correct?
A
Extensive use of chemical fertilizers may lead to eutrophication of nearby water bodies
B
Both Azotobacter and Rhizobium 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 fertilizers

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