Human Health and Diseases Chapter-Wise Test 25

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about autoimmunity is incorrect?

Autoimmune diseases occur when the immune system attacks the body's own cells.
Autoimmune diseases are caused by external pathogens.
Rheumatoid arthritis is an example of an autoimmune disease.
Multiple sclerosis is an autoimmune disease.
2

Autoimmune diseases are not caused by external pathogens; they occur when the immune system mistakenly attacks the body's own cells.

Which of the following is the causative agent of typhoid fever?

Vibrio cholerae
Plasmodium vivax
Salmonella typhi
Mycobacterium tuberculosis
3

Typhoid fever is caused by the bacterium Salmonella typhi, which spreads through contaminated food and water.

Which lymphoid organ is responsible for the maturation of T-lymphocytes?

Spleen
Liver
Thymus
Bone marrow
3

The thymus gland is responsible for the maturation of T-lymphocytes, which are essential for immune responses.

Which organ in the human body acts as a filter for blood-borne pathogens and is a major lymphoid organ?

Liver
Spleen
Thymus
Lymph nodes
2

The spleen is a major lymphoid organ that filters blood-borne pathogens and contains lymphocytes and macrophages.

Which of the following statements about B-lymphocytes is incorrect?

B-lymphocytes are responsible for humoral immunity.
B-lymphocytes mature in the bone marrow.
B-lymphocytes directly destroy virus-infected cells.
B-lymphocytes differentiate into plasma cells to produce antibodies.
3

B-lymphocytes do not directly destroy virus-infected cells; they produce antibodies that neutralize pathogens.

Which type of hypersensitivity reaction involves IgE antibodies and mast cells?

Type I
Type II
Type III
Type IV
1

Type I hypersensitivity reactions, such as allergies, involve IgE antibodies binding to mast cells, leading to histamine release.

Which class of immunoglobulin is primarily responsible for primary immune response?

IgA
IgG
IgM
IgE
3

IgM is the first antibody produced during the primary immune response to infection.

Which of the following diseases is caused by a helminth parasite?

Tuberculosis
Pneumonia
Filariasis
Dengue
3

Filariasis is caused by the helminth Wuchereria bancrofti, which affects the lymphatic system.

Which of the following is an example of passive immunity?

Vaccination
Injection of pre-formed antibodies
Natural infection and recovery
Development of memory cells
2

Passive immunity occurs when pre-formed antibodies are directly introduced into the body, such as in tetanus antitoxin administration.

Which of the following is a mode of transmission for ascariasis?

Inhalation of airborne spores
Consumption of contaminated food and water
Mosquito bite
Direct contact with an infected person
2

Ascariasis is transmitted through the ingestion of Ascaris lumbricoides eggs present in contaminated food and water.

Performance Summary

Score:

Category Details
Total Attempts:
Total Skipped:
Total Wrong Answers:
Total Correct Answers:
Time Taken:
Average Time Taken per Question:
Accuracy:
0