Class 8 Science chapter 3 Health The Ultimate Treasure explores how healthy habits, clean environments, and awareness about communicable and non-communicable diseases can help us lead healthier lives.
Health is often misunderstood as merely the absence of disease, but it’s a much broader concept. According to WHO, it is a state of complete physical, mental, and social well-being.
You’ll also learn how lifestyle, environment, and emotions affect your health, and how prevention is better than cure through the use of vaccines, hygiene, and balanced living.
Health The Ultimate Treasure Worksheet
Our worksheets include different types of practice questions like MCQs, fill in the blanks, and short and long answers. The questions cover concepts such as health and well-being, healthy lifestyle, hygiene, communicable and non-communicable diseases, pathogens, disease transmission, immunity, vaccines, antibiotics, antibiotic resistance, and disease prevention.
With our engaging and well-structured worksheets, students can reinforce their classroom learning, prepare for exams, and develop a strong foundation in science.
Also download:
Class 8 Social Science Worksheet
Class 8th Science NCERT Solutions Curiosity
Science Class 8 Chapter 3 Study Notes
What is Health?
Health is a state of complete physical, mental, and social well-being.
Not just absence of disease, but ability to handle stress, adapt socially, and stay physically fit.
Factors Affecting Health
– Lifestyle (diet, exercise, sleep)
– Environment (clean air/water, hygiene)
– Emotional health (stress, loneliness)
Healthy Habits
– Balanced diet
– Regular exercise
– Personal hygiene
– Proper sleep
– Limiting screen time
– Mental relaxation (e.g., meditation, yoga)
Diseases: Types & Causes
Communicable diseases – spread from person to person via air, water, food, contact.
Caused by pathogens: bacteria, viruses, fungi, worms.
Examples: Flu, Measles, Tuberculosis, Dengue, Cholera.
Non-communicable diseases (NCDs) – not spread from person to person.
Caused by poor lifestyle or nutrition.
Examples: Diabetes, Asthma, Obesity, Cancer.
Deficiency Diseases – caused by lack of nutrients.
Examples: Scurvy (Vitamin C), Anaemia (Iron), Goitre (Iodine)
Immunity & Vaccination
Immunity: Body’s defense system.
Vaccines help build immunity without causing disease.
Edward Jenner created the first vaccine (for smallpox).
Antibiotics
Kill bacteria but do NOT work on viruses.
Overuse leads to antibiotic resistance—bacteria no longer respond to treatment.
Health The Ultimate Treasure Extra Questions
Q1. What is meant by health?
Ans: Health is a state of complete physical, mental, and social well-being and not just the absence of disease.
Q2. What are communicable diseases? Give two examples.
Ans: Communicable diseases are diseases caused by pathogens that can spread from one person to another. They may spread through air, direct or indirect contact, contaminated food and water, or vectors such as mosquitoes.
Examples include influenza and typhoid. Other examples are chickenpox, measles, tuberculosis, cholera, malaria, and dengue.
Q3. What are vaccines? How do they help protect us from diseases?
Ans: Vaccines are preparations that help the body’s immune system develop protection against particular diseases. They may contain weakened or dead pathogens, harmless parts of pathogens, or other forms that safely train the immune system.
Vaccines help the immune system recognise and attack harmful germs. Therefore, vaccination can prevent serious infectious diseases and reduce their spread.
Q4. What are deficiency diseases?
Ans: Diseases caused by lack of nutrients, e.g., Anaemia, Scurvy, Goitre.