The book's fifth chapter is very interesting as the chapter's name raises many questions in a student's mind. This chapter is important as it informs the students about what exactly an illness is, its causes, and the measures that can be taken to prevent it. This chapter mainly revolves around health. It is a state where the individual can perform all the functions well, physically and mentally. This chapter separately explains the concept of healthy and disease-free. It informs the students about the various factors that predict good health and the factors that affect good health. We also learn about the various causes, infecting agents, and germs that can cause disease. Also, the precautions that can be taken to protect oneself from that kind of disease.
The chapter is designed to clear all the doubts that might arise in a student's mind while reading the textbook. The book contains a hundred questions, and every answer in the Aakash Lakhmir Singh Solutions for class 9th Biology is written in an easy language. The solutions cover all the questions on the chapter's topics and might arise while reading the textbook. Continuous practising of the questions helps the students to be confident. It helps them to answer all the questions with the right kind of approach. It is the best guide that a student can ask for as it is a one-stop solution to all the kinds of questions that might be asked in an exam. The chapter also contains pictures and various diagrammatic representations that keep the students interested in the subject matter and provide a visual knowledge base.