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  3. 9th Class
  4. Science
  5. Improvement in food resources

9th Class Science Improvement in food resources Question Bank Improvement in Food Resources

  • question_answer
    Which of the following is the best method to control plant diseases?

    A) The selection of disease resistant varieties  

    B) The introduction of disease resistant varieties

    C) The breeding of permanent resistant varieties

    D) Biological control

    Correct Answer: A

    Solution :

    Weeds are unwanted plants in the cultivated field e.g., Xanthium, parthenium and cyperinus.


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