The reason that the chemical/synthetic fertilizers should be replaced by biofertilizers…

Biology · Class 12 · CBSEMicrobes in Human Welfare

The reason that the chemical/synthetic fertilizers should be replaced by biofertilizers is that the former
  1. are source of environmental pollution
  2. are expensive
  3. exhaust the valuable energy resources for their manufacture
  4. all of these.

Answer

(D) all of these.

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