Why Do We Fall Ill? Class 9 Science 20 Important Questions with answer

20 important questions related to the chapter "Why Do We Fall Ill?" for Class 9 Science. These questions cover various aspects of the chapter, including the nature of diseases, their causes, prevention, and treatment. Here they are:

1. What is health?

• Health refers to a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity. It encompasses physical fitness, emotional stability, and social adaptability.

2. What is disease?

• A disease is a condition in which the body's normal functioning is impaired due to an abnormal condition that affects its structure or function, leading to symptoms and signs that disrupt daily activities.

3. What are the two main types of diseases?

• Diseases are broadly classified into two types:
  • Communicable diseases: These can be transmitted from one person to another, such as flu, tuberculosis, and COVID-19.
  • Non-communicable diseases: These are not transmitted between individuals and include conditions like diabetes, cancer, and heart disease.

4. How are communicable diseases transmitted?

• Communicable diseases can be transmitted through various means:
  • Direct contact: Through touch or bodily fluids.
  • Indirect contact: Through contaminated surfaces or objects.
  • Airborne: Via droplets in the air.
  • Vector-borne: Through insects like mosquitoes.
  • Food and water: Through contaminated food or water.

5. What are the common symptoms of communicable diseases?

• Symptoms vary by disease but often include fever, cough, sore throat, fatigue, rash, nausea, and vomiting.

6. What are non-communicable diseases?

• Non-communicable diseases are chronic and long-lasting diseases that are not caused by infectious agents. They include cardiovascular diseases, respiratory diseases, diabetes, and cancer.

7. What are the major risk factors for non-communicable diseases?

• Risk factors include unhealthy diet, lack of physical activity, smoking, excessive alcohol consumption, and genetic predisposition.

8. How can we prevent communicable diseases?

• Prevention strategies include:
  • Vaccination: Immunizing against specific diseases.
  • Good hygiene: Regular handwashing, using sanitizers.
  • Avoiding contact: Staying away from infected individuals.
  • Safe food and water: Ensuring food safety and drinking clean water.
  • Vector control: Using repellents and eliminating breeding grounds for insects.

9. How can non-communicable diseases be managed or prevented?

• Management and prevention strategies include:
  • Healthy lifestyle: Regular exercise and a balanced diet.
  • Regular screenings: For early detection of diseases.
  • Avoiding risk behaviors: Such as smoking and excessive drinking.
  • Medical check-ups: For monitoring and managing health conditions.

10. What is immunity?

• Immunity is the body’s ability to resist or fight off infections and diseases through its immune system, which includes various cells and proteins.

11. What are the types of immunity?

• Innate Immunity: The natural defenses present from birth, such as skin and mucous membranes.
• Acquired Immunity: Developed through exposure to diseases or vaccination, and includes both active (developed after infection or vaccination) and passive (acquired through antibodies from another source) immunity.

12. How do vaccines work?

• Vaccines stimulate the immune system to recognize and fight specific pathogens by introducing a weakened or inactive form of the pathogen, or its components, into the body, thereby providing immunity against future infections.

13. What is a chronic disease?

• A chronic disease is a long-lasting condition that can be controlled but not cured completely, such as diabetes, arthritis, and hypertension.

14. What is an acute disease?

• An acute disease is one that has a rapid onset and a short duration, such as the common cold or influenza.

15. How does lifestyle affect health?

• Lifestyle choices such as diet, physical activity, smoking, and alcohol consumption significantly impact overall health and can either prevent or contribute to the development of diseases.

16. What is the role of sanitation in disease prevention?

• Proper sanitation practices, including clean drinking water, proper waste disposal, and maintaining hygiene, play a crucial role in preventing the spread of diseases, especially communicable ones.

17. What is the significance of personal hygiene in health?

• Personal hygiene practices such as regular handwashing, dental care, and bathing help prevent infections and the spread of diseases by removing pathogens from the body.

18. How do environmental factors influence health?

• Environmental factors like air and water pollution, exposure to chemicals, and living conditions can impact health by increasing the risk of diseases and affecting overall well-being.

19. What is the role of a balanced diet in maintaining health?

• A balanced diet provides essential nutrients required for maintaining bodily functions, preventing deficiencies, and supporting the immune system, thereby contributing to overall health and disease prevention.

20. How can public health policies contribute to disease prevention?

• Public health policies, such as vaccination programs, health education, and regulations for safe food and water, play a vital role in preventing disease outbreaks and promoting community health.

These questions and answers should provide a comprehensive overview of the chapter "Why Do We Fall Ill?" and help in understanding the various aspects of health and disease.