Chapter 13: Why Do We Fall Ill? – NCERT Exemplar Solutions for Class 9 Science
This chapter deals with health and diseases, focusing on the reasons why we fall ill. Students learn that health is not just the absence of disease but a state of complete physical, mental, and social well-being. The factors affecting health, such as personal hygiene, environmental conditions, nutrition, and social lifestyle, are explained in detail.
The chapter categorizes diseases into acute and chronic, infectious and non-infectious, providing examples for each. It also explains how diseases spread through air, water, vectors, or direct contact. The role of microorganisms in causing diseases like malaria, tuberculosis, and AIDS is highlighted, along with methods of prevention and treatment. Immunity and vaccination are important topics, where students learn how the body defends itself from pathogens. The importance of public health measures, sanitation, and awareness in disease prevention is also emphasized. NCERT Solutions for Class 9 Science provide structured answers to exercise questions, while NCERT Exemplar Solutions for Class 9 Science include case-based and application-oriented problems that build deeper understanding. By practicing both, students not only prepare for exams but also develop awareness about maintaining good health in real life.