9th Class Science Improvement in food resources Question Bank 9th CBSE Science Improvement in food resources

  • question_answer
      Why should preventive measures and biological control methods be preferred for protecting crops?                                 [NCERT]

    Answer:

                      Preventive measures and biological control methods are preferred because:   (i) They are simple.                                                     (ii) They are more economic. (iii) They minimise pollution without affecting the soil quality.


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