NCERT Important Questions Class 9 Science biology Chapter 13
Important NCERT Extra Questions
Chapter 13 Why do We Fall ill
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
Why do some children fall ill more frequently than others living in the same locality?
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Children fall ill more frequently due to (i) poor personal hygiene; (ii) poor domestic hygiene; (iii) unclean food; (iv) lack of proper nutrition and balanced diet. All these factors make the immune system weak.