2. Questions Bank
  3. 9th Class
  4. Science
  5. Why do we fall Ill?

9th Class Science Why do we fall Ill? Question Bank Health and Diseases

  • question_answer
    Why are houseflies NOT considered as biological vectors?

    A) They do not spread diseases.

    B) They do not transmit disease directly.

    C) They are parasites and not vectors.

    D) All of these  

    Correct Answer: D

    Solution :

    Microorganisms cause infectious diseases.


You need to login to perform this action.
You will be redirected in 3 sec spinner