Hello Students for your better preparation of CBSE CLASS 9 here we are sharing complete solution of NCERT CLASS 9 SCIENCE Chapter 13 Why Do We Fall ill – with Complete explanation, Summary, NCERT CLASS 9 SCIENCE  Short Answer Questions, NCERT CLASS 9 SCIENCE  Long Answers, NCERT CLASS 9 SCIENCE MCQS, NCERT CLASS 9 SCIENCE mind maps.