Human Health and Diseases Chapter-Wise Test 18

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following statements about histamine is incorrect?

Histamine is released by mast cells.
Histamine is involved in allergic reactions.
Histamine inhibits inflammation.
Histamine causes vasodilation.
3

Histamine does not inhibit inflammation; instead, it promotes inflammation and allergic responses.

Which of the following statements about antibodies is incorrect?

Antibodies are produced by B-lymphocytes.
Antibodies help neutralize pathogens.
Antibodies can directly destroy bacteria.
Antibodies recognize and bind to specific antigens.
3

Antibodies do not directly destroy bacteria; instead, they mark them for destruction by immune cells.

Which class of immunoglobulin is responsible for allergic reactions?

IgA
IgG
IgM
IgE
4

IgE antibodies are involved in allergic reactions by triggering the release of histamines from mast cells.

Which of the following statements about cancer is TRUE?

Benign tumors spread to distant organs
Malignant tumors undergo metastasis
Cancerous cells have controlled growth
Cancer is always hereditary
2

Malignant tumors exhibit metastasis, meaning they spread to distant organs through the blood or lymph.

Which of the following diseases is caused by a virus?

Typhoid
Pneumonia
AIDS
Amoebiasis
3

AIDS is caused by the Human Immunodeficiency Virus (HIV), which attacks the immune system.

Which of the following statements about vaccines is correct?

Vaccines provide passive immunity.
Live-attenuated vaccines contain dead pathogens.
Vaccines stimulate the immune system to produce memory cells.
Toxoid vaccines contain live pathogens.
3

Vaccines work by stimulating the immune system to produce memory cells that provide long-term immunity.

Which of the following statements about lymph is incorrect?

Lymph carries white blood cells.
Lymph plays a role in immune defense.
Lymph contains red blood cells.
Lymphatic vessels transport lymph throughout the body.
3

Lymph does not contain red blood cells; it carries white blood cells and helps in immune defense.

Which of the following statements about malaria is incorrect?

Malaria is caused by Plasmodium species.
Malaria is transmitted by Anopheles mosquitoes.
Malaria can be prevented by eliminating mosquito breeding sites.
Malaria is a bacterial infection.
4

Malaria is caused by Plasmodium, a protozoan, and not by bacteria.

Which disease is characterized by severe muscle spasms and lockjaw?

Tuberculosis
Tetanus
Pneumonia
Typhoid
2

Tetanus is caused by Clostridium tetani and is characterized by severe muscle stiffness and lockjaw.

Which of the following pathogens causes typhoid fever in humans?

Streptococcus pneumoniae
Salmonella typhi
Haemophilus influenzae
Plasmodium vivax
2

Typhoid fever is caused by the bacterium Salmonella typhi, which spreads through 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