NCERT Exemplar Solution for Class 9 Science Chapter-13 Why Do We Fall Ill?
Health is one of the most important aspects of human life, and understanding diseases helps students become more aware of how the body functions. The chapter Why Do We Fall Ill? explains the causes of diseases, different types of infections, and methods of prevention. This chapter is highly important for students because it connects science with everyday life. The NCERT Exemplar Solution for Class 9 Science helps learners strengthen their concepts through application-based questions and detailed explanations. By practicing the NCERT Exemplar Solution students can clearly understand the difference between health and disease, the role of immunity, and how proper nutrition and hygiene contribute to a healthy life.
Find the Exercises PDF of NCERT Exemplar Solution for Class 9 Science Chapter-13 Why Do We Fall Ill?
Important Concepts Covered in Why Do We Fall Ill?
The chapter introduces students to the meaning of health and explains why maintaining good health is necessary for a better life. It also describes the causes behind diseases and the ways infections spread from one person to another.
Some major topics discussed in the chapter include:
- Meaning of health and disease
- Acute and chronic diseases
- Infectious and non-infectious diseases
- Causes of diseases
- Spread of communicable diseases
- Importance of hygiene and sanitation
- Vaccination and immunity
- Public health services
- Balanced diet and healthy lifestyle
Students studying through the NCERT Exemplar Solution for Class 9 Science gain conceptual clarity because exemplar questions are designed to test analytical thinking and practical understanding.
Types of Diseases Explained in the Chapter
One of the most important sections in the chapter focuses on diseases and their classification. Diseases are mainly divided into infectious and non-infectious categories.
Infectious Diseases
These diseases are caused by microorganisms such as bacteria, viruses, fungi, and protozoa. They can spread from one person to another through air, water, food, or insects.
Examples include:
- Tuberculosis
- Common cold
- Malaria
- Cholera
- Dengue
The chapter also explains carriers like mosquitoes and houseflies that help diseases spread quickly in crowded or unhygienic surroundings.
Non-Infectious Diseases
These diseases do not spread between people. They may occur due to nutritional deficiencies, genetic disorders, or unhealthy lifestyles.
Examples include:
- Diabetes
- High blood pressure
- Cancer
- Deficiency diseases
The NCERT Exemplar Solution helps students understand the differences between these diseases through real-life examples and conceptual questions.
Prevention and Healthy Living
The chapter strongly emphasizes prevention as the best way to remain healthy. Instead of only treating diseases, people should focus on maintaining good health through proper habits and cleanliness.
Important preventive measures discussed include:
- Drinking clean water
- Eating nutritious food
- Exercising regularly
- Maintaining personal hygiene
- Keeping surroundings clean
- Getting vaccinated on time
- Avoiding stagnant water to prevent mosquito breeding
Vaccination is another major topic in this chapter. Vaccines help the body develop immunity against harmful microorganisms. The chapter explains how immunization programs protect children and communities from dangerous diseases.
The role of public health services is also highlighted. Hospitals, sanitation systems, vaccination drives, and awareness campaigns all contribute to disease prevention and healthier societies.
Practicing the NCERT Exemplar Solution for Class 9 Science enables students to improve their understanding of disease prevention and prepare effectively for school examinations.
Why Students Should Practice NCERT Exemplar Questions?
NCERT Exemplar questions are designed to improve conceptual learning rather than rote memorization. These questions challenge students to think scientifically and apply knowledge in practical situations.
Benefits of practicing exemplar solutions include:
- Better understanding of scientific concepts
- Improvement in logical reasoning
- Strong preparation for exams
- Clear explanations of difficult topics
- Development of analytical thinking skills
Students who regularly practice exemplar questions often perform better in both objective and subjective examinations.