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Home / CBSE Class 9 / Biology / Why Do We Fall Ill?

Why Do We Fall Ill? CBSE Class 9

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Why Do We Fall Ill? Topics

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Question 1/20

Q 1. What is required for being healthy and disease-free?

Solution

To be disease-free, balanced diet, good sanitation and personal hygiene are necessary. 

Q 2. Which of the following causes kala azar?

Solution

Kala azar is a chronic infectious disease caused by parasites of the Leishmania donovani complex. 

Q 3. Which of the following is an airborne disease?

Solution

Diphtheria is a bacteria caused by Corynebacterium diphtheriae which is spread through air. 

Q 4. Which of the following is not caused by bacteria?

Solution

Malaria is caused by the protozoan Plasmodium vivax. 

Q 5. Which of the following is a fungal infection?

Solution

Ringworm of the body is a fungal infection which develops on the top layer of the skin. 

Q 6. Which of the following can make you ill if you come in contact with an infected person?

Solution

Sneezing can make you ill if you come in contact with an infected person. 

Q 7. Which of the following is not a viral disease?

Solution

Typhoid is bacterial disease caused by Salmonella typhi. 

Q 8. Which of the following is a mismatch?

Solution

Typhoid is caused by the bacteria Salmonella typhi. 

Q 9. Which of the following is a major aspect of personal hygiene?

Solution

Physical exercise is a major aspect of personal hygiene. 

Q 10. Mosquito is not a vector for

Solution

Typhoid fever is caused by Salmonella typhi bacteria. 

Q 11. Which health refers to individuals emotional well-being?

Solution

Mental health refers to an individuals emotional and psychological well-being. 

Q 12. The droplet method of transmission of disease is found in

Solution

Common cold is transmitted by infected air borne droplets. 

Q 13. The only way to get all the nutrients you need is

Solution

All the nutrients we eat are a combination of carbohydrates, proteins and fats which is a perfect balanced diet. 

Q 14. What are the major factors which affect health?

Solution

Major factors which affect health are nutrition, physical activity and personal hygiene. 

Q 15. Hepatitis is transmitted by

Solution

Transmission of hepatitis is chiefly caused by drinking contaminated water or eating contaminated food. 

Q 16. Which of the following is not a healthy habit?

Solution

We should stay away from alcohol, narcotic drugs and smoking as these are habit-forming and have a harmful effect on our health. They also cause physical weakness, high blood pressure and heart diseases. 

Q 17. Which of the following is not transferred by houseflies?

Solution

AIDS is not transferred by houseflies. It is transferred by HIV. 

Q 18. Which of the following is a chronic disease?

Solution

Diabetes mellitus is a chronic disease caused by inherited and/or acquired deficiency in the production of insulin by the pancreas. 

Q 19. Which of the following is not a reason for following a vegetarian diet?

Solution

All the options are valid reasons. 

Q 20. Which of the following is not a symptom?

Solution

Common cold is a disease. 

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Why Do We Fall Ill? Notes

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