Human Health And Diseases Mock Tests

21 questions available

Human Health And Diseases Mock Test 1

Questions: 21

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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

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

Malaria in humans is caused by Plasmodium parasites. The symptoms of malaria (fever, chills, vomiting) occur due to:

A Release of toxic substances (haemozoin) when red blood cells are lysed by merozoites

B Direct destruction of liver cells by the parasites

C The rapid multiplication of the parasite in the brain blood vessels

D Destruction of white blood cells by the parasite

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

Bioaccumulation of DDT in an aquatic food chain shows the following concentrations: phytoplankton → zooplankton → fish → fish-eating birds. Which statement best explains the observed pattern?

A DDT is rapidly metabolized and excreted by all organisms in the food chain

B DDT is fat-soluble and biomagnifies — concentration increases at each trophic level, causing eggshell thinning in birds

C Zooplankton absorb DDT directly from water at higher concentrations than phytoplankton

D Fish at higher trophic levels have enzymes that convert DDT into a less toxic form

Class 12 Biology

HIV, a retrovirus, uses reverse transcriptase to:

A Convert its single-stranded RNA genome into double-stranded DNA, which then integrates into the host genome as a provirus

B Translate viral proteins directly from the RNA genome without any DNA intermediate

C Replicate its RNA genome directly without converting it to DNA

D Degrade the host cell's DNA to prevent immune response activation

Class 12 Biology

HIV is classified as a retrovirus because it:

A Contains RNA as genetic material and uses reverse transcriptase to synthesise DNA

B Contains DNA as genetic material and integrates directly into the host genome

C Has a lipid envelope derived from the host cell membrane

D Replicates only inside host cells using host cellular machinery

Class 12 Biology

HIV primarily causes immunodeficiency in humans by:

A Directly destroying red blood cells, reducing oxygen transport

B Infecting and destroying helper T-lymphocytes (CD4+ T cells), reducing immune response

C Blocking the production of antibodies in plasma cells

D Causing uncontrolled cell division in the bone marrow

Human Health And Diseases Mock Tests

Human Health And Diseases Mock Test 1

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