Biology ยท Science General

Disease Causative Agents

2,531 Questions

Disease causative agents questions test your understanding of viral, bacterial, and fungal infections, along with their transmission methods. These are common topics in general science sections of SSC and railways exams. Practice these questions to accurately identify disease pathogens and symptoms.

Viral diseasesFoodborne illnessesDisease transmission methodsExtrinsic disease factorsCommon pathogens

Disease Causative Agents Questions

Multiple choice
  1. haemophilia B

  2. hepatitis B

  3. the Down's syndrome

  4. sleeping sickness

  5. None of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is a blood clotting disorder caused by a mutation of the Factor IX gene, leading to a deficiency of Factor IX. It is the second most common form of haemophilia, rarer than haemophilia A. It is sometimes called Christmas disease

Multiple choice
  1. kidneys

  2. liver

  3. heart

  4. brain

  5. none of these

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Meningitis is inflammation of the meninges. The meninges is the collective name for the three membranes that envelope the brain and spinal cord (central nervous system), called the dura mater, the arachnoid mater, and the pia mater. The meninges' main function, alongside the cerebrospinal fluid is to protect the central nervous system.

Multiple choice
  1. Syphilis

  2. Gonorrhea

  3. Typhoid

  4. AIDS

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Syphilis, Gonorrhea, and AIDS (HIV) are sexually transmitted infections. Typhoid fever is caused by Salmonella typhi bacteria transmitted through contaminated food and water, not sexual contact.

Multiple choice
  1. bacteria

  2. fungi

  3. virus

  4. worm

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gonorrhea is caused by the bacterium Neisseria gonorrhoeae, which is a gram-negative diplococcus. It primarily infects the mucous membranes of the reproductive and urinary tracts. Unlike fungal, viral, or worm infections, gonorrhea responds to antibiotic treatment targeting bacterial cell structures.

Multiple choice
  1. Diabetes

  2. Diarrhoea

  3. Brain fever

  4. Malaria

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Japanese encephalitis is a viral brain infection transmitted by mosquitoes, often colloquially called 'brain fever' due to the inflammation and swelling of brain tissue it causes. Diabetes is a metabolic disorder, diarrhoea is a gastrointestinal condition, and malaria is a blood infection affecting different systems entirely.

Multiple choice
  1. Kala-azar

  2. Hepatitis

  3. SARS

  4. Amoebiasis

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hepatitis specifically causes inflammation of the liver, whether from viral infection (Hepatitis A, B, C), alcohol, toxins, or autoimmune conditions. Kala-azar primarily affects the spleen and liver but is a parasitic disease called visceral leishmaniasis, SARS is a respiratory illness, and amoebiasis mainly infects the intestines.

Multiple choice
  1. Lungs

  2. Heart

  3. Gut

  4. Liver

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When microbes enter through the nose, they travel down the respiratory tract and primarily infect the lungs and respiratory system. The heart is vascular and not directly accessible this way, while the gut requires swallowing through the mouth, and the liver would require bloodstream circulation from the lungs.

Multiple choice
  1. gastrointestinal disorder

  2. brain disorder

  3. lung disorder

  4. kidney disorder

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Diarrhoea is fundamentally a gastrointestinal disorder involving frequent loose or watery bowel movements, typically caused by infections, toxins, or malabsorption in the digestive tract. It does not involve the brain, lungs, or kidneys as primary affected organs.

Multiple choice
  1. Bacteria

  2. Virus

  3. Protozoa

  4. Fungi

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Brain fever (Japanese encephalitis) is caused by a flavivirus transmitted by mosquitoes, not by bacteria, protozoa, or fungi. The virus directly infects and inflames brain tissue, causing the characteristic symptoms of encephalitis.

Multiple choice
  1. By accidents

  2. By animal bite

  3. By sexual contact

  4. By physical contacts

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rabies virus is transmitted through the saliva of infected animals, typically entering the body through a bite wound. It does not spread through accidents, sexual contact, or casual physical touching.