Biology ยท Science General

Disease Causative Agents

2,258 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

Which one of the following is a bacterial disease?

  1. Typhoid

  2. Rabies

  3. Night blindness

  4. Ringworm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Typhoid fever is caused by Salmonella typhi, a bacterium transmitted through contaminated food and water. Rabies is viral, Night blindness is from vitamin A deficiency, and Ringworm is fungal - only Typhoid is bacterial among these options.

Multiple choice

Pyorrhea is a condition of:

  1. infected gums

  2. infected vagina

  3. infected lungs

  4. infected breast
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pyorrhea (periodontitis) is a gum infection causing inflammation, bleeding, and tissue damage around teeth. It affects periodontal tissues. The other options refer to infections in unrelated body systems.

Multiple choice

Which of the following pathogens was not discovered by Robert Koch?

  1. Mycobacterium tuberculosis

  2. Mycobacterium leprae

  3. Bacillus anthracis

  4. Vibrio cholerae
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Gerhard Henrik Armauer Hansen discovered Mycobacterium leprae in 1873. This was the first time that a chronic infectious disease in humans was shown to be related to a bacillus.

Multiple choice

The causal organism of gonorrhea is a _____________.

  1. bacteria

  2. fungi

  3. virus

  4. worm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Gonorrhea is a sexually transmitted infection caused by Neisseria gonorrhoeae, which is a bacterium. It specifically infects the mucous membranes of the reproductive and urinary tracts. Fungi, viruses, and worms cause different types of infections.

Multiple choice

Which of the following microorganisms is associated with comedones?

  1. Staphylococcus aureus

  2. Haemophilus parainfluenzae

  3. Corynaebacterium

  4. Propionibacterium acne
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Comedones are associated with Propionibacterium acne. This bacterium causes acne vulgaris. In the first stage of the disease, comedones are formed where distension of the glands is caused by an accumulation of sebum, hair and bacteria.

Multiple choice

Directions: Select the correct alternative from the given choices.

Which disease is caused by corona virus?

  1. Bronchitis

  2. Diphtheria

  3. SARS

  4. Whooping cough
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

SARS (Severe Acute Respiratory Syndrome) is caused by the SARS-CoV-1, a coronavirus. It emerged in 2002-2003 and caused a global outbreak. The other options are caused by different pathogens: Bronchitis is usually viral or bacterial, Diphtheria is bacterial, and Whooping cough is caused by Bordetella pertussis bacteria.

Multiple choice

Which of the following statements is true regarding enteropathogenic E. coli?

  1. It produces a heat labile toxin.

  2. It invades epithelial cells of the large intestine.

  3. It colonises jejunum and upper ileum of the small intestine.

  4. It is an opportunistic infectant, otherwise it resides on human body as normal flora.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Enteropathogenic E. coli colonises jejunum and upper ileum of the small intestine. It causes a moderate to severe gastroenteritis in humans and animals.