CBSE Class 9 Science NCERT Solutions: Chapter 13, Why Do We Fall Ill

Find here the Science NCERT Solutions for CBSE Class 9 chapter - Why Do We Fall Ill. It includes a detailed explanation of the NCERT Solutions and clears the various methods and techniques of solving the questions assigned in the NCERT textbooks.

Class 9 Science NCERT Solutions
Class 9 Science NCERT Solutions

To help students retrieve the right solutions for all the questions given in CBSE Class 9 Science NCERT book we have collated detailed and accurate answers here at Explained by subject matter experts, all these solutions will help students learn the right technique to write perfect answers in the annual exams to get high scores.

In this article we are providing the NCERT solutions for Class 9 Science chapter 13, Why Do We Fall Ill. Our subject experts have reviewed these NCERT solutions to provide you the error free content which will make it easy for you to prepare easily and effectively for the annual exams.

All the class 9 Science NCERT solutions are available in PDF format which students may easily download free of cost. 

Main topics discussed in Class 9 Science chapter- Why Do We Fall Ill are:

Career Counseling
  • Health and its failure
  • The significance of ‘health’
  • Distinctions between ‘healthy’ and ‘disease-free’
  • Disease and its causes
  • Acute and chronic diseases
  • Chronic diseases and poor health
  • Causes of diseases
  • Infectious and non-infectious diseases
  • Organ-specific and tissue specific manifestations
  • Principles of treatment of a disease
  • Principles of prevention of a disease

Students may download all the NCERT Solutions for CBSE Class 9 Science chapter – Why Do We Fall Ill, in the form of PDF.

Some of the questions and their solutions from NCERT Solutions for Class 9: Why Do We Fall Ill, are as follows:

Q. State any two conditions essential for good health.


Good health of a person depends on

a) Social environment.

b) Public cleanliness.

c) Good economic conditions and earnings.

d) Social equality and harmony.

Q. Are the answers to the above questions necessarily the same or different? Why?


The answers are not same all the time, because the meaning of health varies from person to person.

For example, good health for a dancer may be being able to stretch his body into difficult but graceful positions. On the other hand, good health for a musician may mean having enough breathing capacity in his/her lungs to control his/her voice. There is one similarity in both the cases. If the conditions essential for good health are maintained, then the chance of getting any disease is zero.

Q. Why are we normally advised to take bland and nourishing food when we are sick?


All the normal functions of the body get disturbed in case illness. So, a nourishing food is required, which is easily digestible and contains all the nutrients. This is the main reason that bland and nourishing food is advised to take during sickness.

Q. What precautions can you take in your school to reduce the incidence of infectious diseases?


To prevent the incidence of infectious diseases in school following precautions can be taken:

a) Avoid contact of students suffering from air borne diseases like common cold, cough, eye, flu, etc.

b) By checking the availability of clean drinking water in school.

c) Clean surroundings in school will not allow the growth and multiplication of vectors.

d) Starting childhood immunisation programmers in schools.

Q. How many times did you fall ill in the last one years? What were the illnesses?

(a) Think of one change you could make in your habits in order to avoid any of/most of the above illnesses.

(b) Think of one change you would wish for in your surroundings in order to avoid any of/most of the above illnesses.


I fell ill twice in the last one year. The disease, I first suffered from was diarrhoea and secondary the dengue fever.

(a) The changes I brought in my habits after suffering from these disease to protect myself in near future are:-

(i) I will always drink clean, pure water and wash hands before eating anything.

(ii) I will live in clean surroundings where disease spreading vectors could not mulitply.

For example: mosquitoes.

(b) Pure drinking water should be available always. The intake of impure water is the main cause of many infectious diseases.

To get the complete solution click on the following link:

CBSE Class 9 Science NCERT Solutions: Why Do We Fall Ill

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