Health and Hygiene – Diseases, Bacteria, Viruses, Parasites Quiz - ICSE Class 9 Biology

Free practice quiz: Health and Hygiene – Diseases, Bacteria, Viruses, Parasites (ICSE Class 9 Biology). 49 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This ICSE Class 9 Biology practice quiz has 49 multiple-choice questions on Health and Hygiene – Diseases, Bacteria, Viruses, Parasites, and 49 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following diseases is primarily transmitted through contaminated water and sanitation, often leading to severe dehydration due to profuse watery diarrhea?

   1. Tuberculosis
   2. Malaria
   3. Cholera
   4. Dengue Fever
   Show answer

   Answer: C. Cholera

   Cholera is an acute diarrheal illness caused by infection of the intestine with Vibrio cholerae bacteria. The infection is often associated with consuming contaminated water or food, leading to severe dehydration. Tuberculosis is airborne, Malaria is mosquito-borne, and Dengue Fever is also mosquito-borne.

2. The life cycle of *Schistosoma mansoni*, a parasitic flatworm causing schistosomiasis, involves an aquatic snail as an intermediate host. Humans are infected when:

   1. Consuming undercooked fish containing cercariae.
   2. Inhaling airborne spores from infected snails.
   3. Larval forms (cercariae) penetrate the skin during contact with contaminated water.
   4. Ingesting eggs passed in the feces of infected animals.
   Show answer

   Answer: C. Larval forms (cercariae) penetrate the skin during contact with contaminated water.

   Schistosomiasis is contracted when free-swimming larval forms of the parasite (cercariae), released from infected freshwater snails, penetrate the skin of humans during contact with infested water. Consuming undercooked fish might transmit other parasites. Inhaling spores is related to fungi. Ingesting eggs is a route for some roundworms and tapeworms, but not the primary route for Schistosoma.

3. The antibiotic penicillin works by inhibiting:

   1. Bacterial protein synthesis
   2. Bacterial DNA replication
   3. Bacterial cell wall synthesis
   4. Viral RNA polymerase
   Show answer

   Answer: C. Bacterial cell wall synthesis

   Penicillin and its derivatives are beta-lactam antibiotics that interfere with the synthesis of peptidoglycan, a crucial component of bacterial cell walls. This weakens the cell wall, leading to cell lysis. Bacterial protein synthesis is targeted by drugs like tetracyclines and macrolides. DNA replication is targeted by quinolones. Viral RNA polymerase is a target for some antiviral drugs.

4. Which of these diseases is caused by a rickettsia bacterium and transmitted by ticks, characterized by fever, headache, and a rash that often starts on the extremities?

   1. Malaria
   2. Lyme Disease
   3. Rocky Mountain Spotted Fever
   4. Plague
   Show answer

   Answer: C. Rocky Mountain Spotted Fever

   Rocky Mountain Spotted Fever (RMSF) is caused by *Rickettsia rickettsii*, a bacterium transmitted by ticks. Symptoms typically include fever, headache, and a rash that often appears on the wrists and ankles. Lyme disease is caused by *Borrelia burgdorferi* and transmitted by ticks. Malaria is caused by *Plasmodium* protozoa and transmitted by mosquitoes. Plague is caused by *Yersinia pestis* and transmitted by fleas.

5. Which of the following is a protozoan parasite that causes malaria and is transmitted to humans by the bite of an infected female *Anopheles* mosquito?

   1. *Trypanosoma brucei*
   2. *Plasmodium falciparum*
   3. *Leishmania donovani*
   4. *Giardia lamblia*
   Show answer

   Answer: B. *Plasmodium falciparum*

   *Plasmodium falciparum* is one of the species of *Plasmodium* that causes malaria in humans. The other parasites listed cause different diseases: *Trypanosoma brucei* causes sleeping sickness, *Leishmania donovani* causes visceral leishmaniasis (kala-azar), and *Giardia lamblia* causes giardiasis.

More questions in this quiz

Answers and explanations are in the full quiz.

1. A virus that infects bacteria is known as a:
2. Which parasitic worm, often contracted by consuming undercooked pork contaminated with its larvae, burrows through the intestinal wall and can migrate to other tissues, forming cysts?
3. The 'common cold' is typically caused by which type of pathogen?
4. Plasmodium falciparum, the causative agent of malaria, is a protozoan parasite transmitted to humans through the bite of an infected:
5. Which of the following is a characteristic of an obligate intracellular parasite?
6. A patient presents with symptoms of fever, cough, and fatigue. A sputum sample is taken and found to contain acid-fast bacilli. Which disease is most likely indicated?
7. Which of these diseases is caused by a prion, a misfolded protein that can induce conformational changes in other proteins?
8. Aedes mosquitoes are vectors for several significant diseases. Which of the following is *NOT* typically transmitted by Aedes aegypti?
9. Which bacterial genus is responsible for causing tetanus, a serious infection characterized by muscle spasms and lockjaw?
10. Hepatitis B is a viral infection that primarily affects which organ?
11. Which of the following describes the mechanism of action for most antiviral drugs?
12. The bacteria responsible for tuberculosis, *Mycobacterium tuberculosis*, are characterized by their unique cell wall composition containing:
13. A person with an active infection of the intestinal tapeworm *Taenia solium* is most likely to exhibit which of the following symptoms?
14. Which of the following viruses is transmitted through the saliva of infected animals, particularly bats and dogs, and causes a fatal neurological disease if not treated promptly with post-exposure prophylaxis?
15. Bacterial endospores are highly resistant structures produced by some bacteria, serving primarily as a means of:
16. The influenza virus belongs to which family of viruses, characterized by their segmented RNA genome and presence of a lipid envelope?
17. Which parasitic disease is characterized by the formation of painful nodules or ulcers on the skin, often starting as a papule at the site of an insect bite, caused by *Leishmania* protozoa transmitted by sandflies?
18. A person who spends time in areas with poor sanitation and consumes contaminated food or water might be at risk of contracting *Giardia lamblia*, an intestinal protozoan parasite. What is the primary mode of transmission for Giardia?
19. Which of the following vaccines utilizes a weakened (attenuated) form of the live virus to stimulate an immune response?
20. The bacterium *Staphylococcus aureus* is known to cause a variety of infections, from minor skin infections to life-threatening conditions like sepsis and pneumonia. It is often characterized by its:
21. Which bacterial disease, historically known as 'consumption', is characterized by chronic inflammation of the lungs, often leading to coughing, fever, and weight loss, and is diagnosed using the Mantoux test and chest X-rays?
22. A common cold or flu can be prevented through measures like frequent handwashing and avoiding close contact with sick individuals. This is an example of:
23. Which virus causes chickenpox and shingles, and belongs to the family Herpesviridae?
24. The transmission of *Ascaris lumbricoides*, the large roundworm, primarily occurs through:
25. Which of the following statements is *TRUE* regarding the mechanism of action of antibiotics versus antivirals?
26. The bacterium *Vibrio cholerae* produces an enterotoxin that causes severe, watery diarrhea by disrupting the normal function of intestinal cells. This leads to rapid fluid and electrolyte loss. What is the primary reservoir and mode of transmission for *Vibrio cholerae*?
27. The phenomenon where a virus remains dormant within host cells for extended periods before becoming active and causing disease (e.g., Varicella-Zoster Virus causing shingles) is known as:
28. Which organ system is primarily targeted by the parasite *Entamoeba histolytica*, causing amoebic dysentery and potentially liver abscesses?
29. The World Health Organization (WHO) recommends vaccination as a key public health strategy. Which type of vaccine typically provides long-lasting immunity by introducing a harmless antigen that mimics the pathogen?
30. Which bacterial pathogen is a common cause of food poisoning, producing heat-stable toxins that can cause vomiting and diarrhea, and is often associated with improperly cooked rice?
31. The Zika virus, which gained significant attention for its association with microcephaly in newborns when pregnant women are infected, is primarily transmitted to humans by:
32. A person suffering from an infection by the filarial worm *Wuchereria bancrofti* might develop lymphedema, commonly known as elephantiasis. This disease is transmitted by:
33. Which of the following is a characteristic of a virus?
34. A bacterial infection that can cause severe respiratory distress, characterized by the production of a potent exotoxin that inhibits protein synthesis, leading to tissue necrosis and potentially paralysis, is:
35. The eradication of smallpox, a major milestone in public health, was achieved primarily through:
36. The ability of certain bacteria to survive in hostile environments by forming a dormant, highly resistant structure is called:
37. Influenza, commonly known as the flu, is caused by influenza viruses. These viruses are characterized by having their genetic material in the form of:
38. Which of the following best describes the hygiene hypothesis regarding allergies and autoimmune diseases?
39. A patient presents with a severe headache, stiff neck, fever, and photophobia. A lumbar puncture reveals bacteria in the cerebrospinal fluid. This patient most likely has:
40. Which of these diseases is caused by a virus that primarily infects the liver and can be transmitted through contaminated food and water or sexual contact?
41. The lifecycle of the tapeworm *Taenia saginata* involves humans as the definitive host and cattle as the intermediate host. Infection occurs when humans consume:
42. Which of the following bacteria is responsible for causing bacterial vaginosis (BV), a common vaginal condition characterized by an imbalance of normal vaginal bacteria, often with a fishy odor and grayish discharge?
43. The discovery of antibiotics revolutionized medicine by providing effective treatments for bacterial infections. Which of the following is NOT a mechanism by which antibiotics work?
44. Which disease, caused by the bacterium *Treponema pallidum*, is a sexually transmitted infection that can progress through several stages, including a primary chancre, a secondary rash, and a latent phase, potentially leading to severe long-term damage to the nervous system and cardiovascular system?

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