Immune System and Diseases Quiz. The immune system is the body’s natural defense mechanism that protects it from harmful microorganisms and diseases. It works through specialized cells, tissues, and organs that recognize and destroy foreign substances. Understanding how the immune system functions and how diseases affect the body helps individuals maintain good health and prevent infections.
Immune System and Diseases Quiz
1. Which system of the body protects against diseases and infections?
A. Digestive system
B. Respiratory system
C. Immune system
D. Circulatory system
2. The main function of white blood cells is to
A. Carry oxygen
B. Fight infections
C. Digest food
D. Produce hormones
3. Which blood cells are responsible for producing antibodies?
A. Red blood cells
B. Platelets
C. Lymphocytes
D. Neutrophils
4. Antibodies are best described as
A. Digestive enzymes
B. Protective proteins
C. Hormones
D. Vitamins
5. Which organ produces white blood cells?
A. Liver
B. Kidney
C. Bone marrow
D. Pancreas
Immune System and Diseases Quiz
6. The first line of defense in the body includes
A. Antibodies and lymphocytes
B. Skin and mucus membranes
C. White blood cells only
D. Red blood cells
7. Which of the following is a communicable disease?
A. Diabetes
B. Cancer
C. Tuberculosis
D. Hypertension
8. Vaccination helps the body by
A. Killing all bacteria directly
B. Producing natural antibiotics
C. Stimulating antibody production
D. Increasing blood volume
9. Which organ filters harmful microorganisms from blood?
A. Heart
B. Spleen
C. Lung
D. Liver
10. A disease that cannot be transmitted from person to person is called
A. Infectious disease
B. Hereditary disease
C. Communicable disease
D. Non-communicable disease
Immune System and Diseases Quiz
11. HIV mainly attacks which type of cells?
A. Red blood cells
B. Platelets
C. White blood cells
D. Nerve cells
12. Which microorganism causes malaria?
A. Virus
B. Bacterium
C. Fungus
D. Protozoan
13. The substance that destroys invading microorganisms is called
A. Antigen
B. Antibody
C. Enzyme
D. Hormone
14. Which of the following is a viral disease?
A. Cholera
B. Tuberculosis
C. Measles
D. Typhoid
15. The swelling of lymph nodes during infection shows that
A. Blood pressure is high
B. White blood cells are active
C. Red blood cells are reduced
D. Platelets are increasing
16. Which of these improves the immune system?
A. Poor diet
B. Lack of sleep
C. Balanced nutrition
D. Drug abuse
17. The process by which white blood cells engulf germs is called
A. Respiration
B. Diffusion
C. Phagocytosis
D. Osmosis
18. Which disease affects the respiratory system mainly?
A. Asthma
B. Malaria
C. Typhoid
D. Diarrhoea
19. Antibiotics are used mainly to treat
A. Viral infections
B. Bacterial infections
C. Fungal infections
D. Protozoan infections
20. The natural resistance of the body to disease is known as
A. Immunity
B. Sensitivity
C. Allergy
D. Adaptation
Immune System and Diseases Quiz
21. Which gland plays a role in developing immune cells in children?
A. Thyroid
B. Thymus
C. Adrenal
D. Pituitary
22. An antigen is a substance that
A. Produces hormones
B. Triggers immune response
C. Digests food
D. Stores energy
23. Which method best prevents the spread of infectious diseases?
A. Poor hygiene
B. Sharing utensils
C. Regular hand washing
D. Crowded living
24. Which disease is caused by bacteria in contaminated water?
A. Malaria
B. Cholera
C. Measles
D. Influenza
25. Which of the following weakens the immune system?
A. Regular exercise
B. Adequate rest
C. Balanced diet
D. Excessive alcohol intake
Immune System and Diseases Quiz Answers And Explanations
1. C – Immune system
The immune system is responsible for protecting the body against disease-causing organisms such as bacteria, viruses, fungi, and parasites. It works by recognizing harmful substances and destroying them before they can cause serious illness.
2. B – Fight infections
White blood cells help the body defend itself by attacking and destroying harmful microorganisms. They move to infected areas and work to remove germs and damaged cells to keep the body healthy.
3. C – Lymphocytes
Lymphocytes are special white blood cells that produce antibodies. These antibodies recognize specific germs and help the body remember them for faster response in the future.
4. B – Protective proteins
Antibodies are proteins made by the immune system to identify and neutralize foreign substances. They bind to germs and mark them for destruction by other immune cells.
5. C – Bone marrow
Bone marrow is the main site where blood cells, including white blood cells, are produced. It plays a major role in maintaining the body’s defense system.
6. B – Skin and mucus membranes
The skin and mucus membranes act as physical barriers that prevent germs from entering the body. They are the first line of defense against infections.
7. C – Tuberculosis
Tuberculosis is a communicable disease because it can spread from one person to another through air droplets when an infected person coughs or sneezes.
8. C – Stimulating antibody production
Vaccination introduces weakened or dead germs into the body, helping the immune system produce antibodies without causing disease, thus preparing the body for future infections.
9. B – Spleen
The spleen filters blood and removes damaged cells and microorganisms. It also stores white blood cells that help fight infections.
10. D – Non-communicable disease
Non-communicable diseases cannot be passed from one person to another. They are often caused by lifestyle, genetics, or environmental factors.
11. C – White blood cells
HIV attacks white blood cells, especially helper T-cells, weakening the immune system and making the body vulnerable to many infections.
12. D – Protozoan
Malaria is caused by a protozoan called Plasmodium, which is transmitted to humans through the bite of infected mosquitoes.
13. B – Antibody
Antibodies destroy or neutralize invading microorganisms by binding to them and helping immune cells recognize and eliminate them.
14. C – Measles
Measles is caused by a virus and spreads easily through air and contact, making it a common viral disease.
15. B – White blood cells are active
Swollen lymph nodes indicate that white blood cells are multiplying and fighting infection, showing that the immune system is responding.
16. C – Balanced nutrition
A balanced diet provides essential nutrients such as vitamins and minerals that strengthen the immune system and improve the body’s resistance to disease.
17. C – Phagocytosis
Phagocytosis is the process by which certain white blood cells surround and digest harmful microorganisms, helping to remove them from the body.
18. A – Asthma
Asthma mainly affects the respiratory system by causing difficulty in breathing due to narrowing of airways and inflammation.
19. B – Bacterial infections
Antibiotics are effective against bacteria but do not work on viruses. They help kill bacteria or stop their growth in the body.
20. A – Immunity
Immunity refers to the body’s ability to resist and fight infections through natural defenses and previous exposure to diseases.
21. B – Thymus
The thymus gland helps in the development and maturation of T-lymphocytes, which are important immune cells, especially in children.
22. B – Triggers immune response
An antigen is any foreign substance that stimulates the immune system to produce antibodies and activate defense mechanisms.
23. C – Regular hand washing
Hand washing removes germs from the hands and prevents them from entering the body or spreading to others, reducing disease transmission.
24. B – Cholera
Cholera is caused by bacteria found in contaminated water and leads to severe diarrhoea and dehydration if not treated quickly.
25. D – Excessive alcohol intake
Excessive alcohol weakens the immune system by reducing the effectiveness of white blood cells, making the body more prone to infections.
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