9th Class Science Why do we fall Ill? Question Bank 9th CBSE Science Why do we fall Ill?

  • question_answer
      Give any four factors necessary for a healthy person.

    Answer:

                      For a healthy person it is necessary that (i) the surrounding environment should be clean. Air and water-borne diseases should not spread. (ii) personal hygiene is maintained to prevent infectious diseases. (iii) proper, sufficient nourishment and food is available for good immune system of our body. (iv) body is immunised against severe diseases.


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