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OJEE Human Health — practice questions

Explore 6 free Human Health questions in OJEE Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Human Health questions and exercises with answers

Showing questions 1–6 of 6.

**Innate immunity** is best described as:Read the answer and worked solution →**Malaria** is caused by which protozoan?Read the answer and worked solution →The **Widal test** is used for diagnosis of:Read the answer and worked solution →**Cannabinoids** (active component: THC) are obtained from:Read the answer and worked solution →Tap what a pathogen must doRead the answer and worked solution →True or false: health and diseaseRead the answer and worked solution →

Worked practice questions

**Innate immunity** is best described as:

  1. Acquired after exposure to a pathogen
  2. Non-specific, present from birth, including physical/chemical/cellular barriers
  3. Only against viruses
  4. Inherited only from mother
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Correct answer: B. Non-specific, present from birth, including physical/chemical/cellular barriers

**Innate (natural) immunity:** present from birth, non-specific. Includes physical barriers (skin, mucous), chemical (gastric acid, lysozyme), cellular (phagocytes, NK cells), and cytokines. First line of defence.

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**Malaria** is caused by which protozoan?

  1. *Entamoeba*
  2. *Plasmodium* (spread by female *Anopheles* mosquito)
  3. *Trypanosoma*
  4. *Leishmania*
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Correct answer: B. *Plasmodium* (spread by female *Anopheles* mosquito)

**Malaria:** *Plasmodium* spp. (P. vivax, P. falciparum, P. malariae, P. ovale, P. knowlesi). **Vector:** female *Anopheles* mosquito. **Life cycle:** liver schizogony, then RBC schizogony causing periodic fevers. P. falciparum is the deadliest.

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The **Widal test** is used for diagnosis of:

  1. Malaria
  2. Typhoid (caused by *Salmonella typhi*)
  3. Tuberculosis
  4. AIDS
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Correct answer: B. Typhoid (caused by *Salmonella typhi*)

**Widal test:** detects agglutinating antibodies (anti-O, anti-H) against *Salmonella typhi*/*paratyphi* antigens in patient serum. Useful 7-10 days after symptom onset. **Modern alternative:** blood culture, IgM ELISA.

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