Human Health And Diseases Mock Tests

21 questions available

Human Health And Diseases Mock Test 1

Questions: 21

Sample Questions

Class 12 Biology

In HIV infection, the virus primarily targets and destroys:

A Erythrocytes

B Helper T-cells (CD4+ T-cells)

C B-lymphocytes

D Platelets

Class 12 Biology

Which of the following is a correct match between a disease and its causative agent?

A Malaria — Trypanosoma; Ringworm — Wuchereria; Typhoid — Salmonella

B Malaria — Plasmodium; Ringworm — Trichophyton; Typhoid — Salmonella

C Malaria — Leishmania; Ringworm — Ascaris; Typhoid — E. coli

D Malaria — Plasmodium; Ringworm — Candida; Typhoid — Vibrio

Class 12 Biology

Which diagnostic test is considered the gold standard for confirming typhoid fever during the first week of illness:

A Widal test

B Blood culture

C Stool culture

D Skin test (Typhoid test)

Class 12 Biology

Primary immune response differs from secondary immune response in which of the following ways:

A Secondary response is faster, stronger, and produces higher levels of antibodies

B Primary response produces IgG antibodies while secondary response produces only IgM

C Secondary response requires a different antigen than the primary response

D Primary response involves only B cells while secondary response involves T cells

Class 12 Biology

The "membrane attack complex" (MAC) in the human complement system functions by:

A Creating pores in the pathogen's cell membrane, leading to cell lysis and death

B Coating the pathogen surface to enhance phagocytosis by macrophages

C Neutralising bacterial toxins by binding to their active sites

D Stimulating B cells to produce antibodies specific to the pathogen

Class 12 Biology

Memory cells in the human adaptive immune system are responsible for immunological memory because they:

A Survive long-term after initial exposure and mount a faster, stronger secondary response upon re-encountering the same antigen

B Produce antibodies continuously without needing antigen stimulation, providing permanent passive immunity

C Directly phagocytose and destroy pathogens without requiring activation by helper T cells

D Mutate their receptor genes randomly to generate new specificities against novel pathogens

Class 12 Biology

Kaposi's sarcoma, non-Hodgkin's lymphoma, and certain types of carcinoma are classified as:

A AIDS-defining cancers caused by immunosuppression from HIV

B Occupational diseases caused by chemical exposure

C Genetic disorders linked to chromosomal abnormalities

D Vegetative phase disorders of the endocrine system

Class 12 Biology

The primary nitrogenous waste product excreted by adult amphibians and most fish is:

A Ammonia — an aquatic (ammonotelic) mode of excretion that requires large amounts of water for dilution

B Urea — a terrestrial (ureotelic) mode of excretion that is less toxic than ammonia

C Uric acid — a terrestrial (uricotelic) mode of excretion that conserves water

D Nitrogen gas — released directly into the atmosphere

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