Human Health and Diseases Chapter-Wise Test 21

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about active immunity is incorrect?

Active immunity develops after exposure to an antigen.
Active immunity involves memory cell formation.
Active immunity is short-lived and does not last long.
Vaccination provides active immunity.
3

Active immunity provides long-lasting protection because it involves the formation of memory cells.

Which of the following is a primary lymphoid organ?

Spleen
Thymus
Lymph nodes
Tonsils
2

The thymus is a primary lymphoid organ where T-lymphocytes mature before they become active in immunity.

Which of the following is the site of maturation for B-lymphocytes in humans?

Thymus
Spleen
Bone marrow
Lymph nodes
3

In humans, B-lymphocytes mature in the bone marrow before they circulate in the immune system.

Which of the following acts as a physical barrier in innate immunity?

Antibodies
Interferons
Skin
Macrophages
3

Skin is a physical barrier that prevents the entry of pathogens into the body.

Which of the following diseases is spread by the bite of an infected female Anopheles mosquito?

Filariasis
Dengue
Malaria
Typhoid
3

Malaria is transmitted by the female Anopheles mosquito, which carries Plasmodium.

Which type of immunity is acquired by recovering from a disease?

Innate immunity
Active acquired immunity
Passive immunity
Cell-mediated immunity
2

Active acquired immunity develops when the immune system produces antibodies in response to an infection.

Which of the following statements about antigen-antibody interactions is incorrect?

Antigens stimulate the production of antibodies.
Antibodies bind to specific antigens to neutralize them.
Antigen-antibody interactions help in immune responses.
Antigens are produced by the immune system.
4

Antigens are foreign substances (like pathogens or toxins) that stimulate an immune response; they are not produced by the immune system.

Which of the following statements about immunological memory is correct?

Immunological memory is a characteristic of innate immunity.
Memory cells help provide faster immune responses upon re-exposure to the same pathogen.
Immunological memory does not involve B-lymphocytes.
Immunological memory provides short-term immunity only.
2

Memory cells, formed during an initial infection, enable the immune system to respond faster and more effectively upon re-exposure to the same pathogen.

Which mosquito-borne disease is characterized by recurring fever and chills?

Filariasis
Malaria
Dengue
Chikungunya
2

Malaria, caused by Plasmodium species, is characterized by recurring fever and chills due to the release of haemozoin toxin.

Which class of immunoglobulin is mainly involved in mucosal immunity?

IgG
IgM
IgA
IgE
3

IgA is primarily found in mucosal secretions, providing protection in the respiratory and gastrointestinal tracts.

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