Biology · 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

Which disease is also known as the Henson's disease?

  1. Malaria

  2. Leprosy

  3. Measles

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

Hansen's disease, commonly known as leprosy, is a chronic infectious disease caused by the bacterium Mycobacterium leprae. It is named after Gerhard Armauer Hansen, who discovered the bacterium.

Multiple choice

Hay fever and asthma belong to the category of

  1. deficiency diseases

  2. degenerative diseases

  3. hormonal diseases

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

Hay fever and asthma are immune system responses to external triggers, which classifies them as allergies. They are not caused by nutrient deficiencies, hormonal imbalances, or natural degeneration.

Multiple choice

Which of the following diseases are caused by Gram-positive spore forming bacteria? P. Anthrax Q. Tetanus R. Cholera S. Typhoid Select the correct answer using codes given below:

  1. P and Q

  2. P and R

  3. Q and R

  4. Q and S

  5. R and S
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Anthrax is an infectious disease caused by the Gram-positive, spore-forming rod-shaped bacterium Bacillus anthracis. Tetanus is an infectious disease caused by the anaerobic Gram-positive, spore-forming bacterium Clostridium tetani.

Multiple choice

Which of the following bacterial diseases are caused by members of genus Clostridium?

  1. Botulism
  2. Gas gangrene
  3. Lyme disease

  1. 1 and 2 only

  2. 1 and 3 only

  3. 2 and 3 only

  4. 1, 2 and 3

  5. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Botulism is a rare and potentially fatal paralytic illness caused by a toxin produced by the bacteria Clostridium botulinum. Gas gangrene is a bacterial infection that produces gas in tissues in gangrene. It is a deadly form of gangrene usually caused by the bacteria Clostridium perfringens.

Multiple choice

Which of the following viral diseases are caused by double stranded DNA viruses? P. Measles Q. Mumps R. Chickenpox S. Smallpox Select the correct answer using codes given below:

  1. P and Q

  2. P and R

  3. Q and R

  4. Q and S

  5. R and S
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Chickenpox is caused by the varicella zoster virus (VZV), an enveloped double-stranded DNA virus. Smallpox is caused by the variola virus, a double stranded DNA virus of the Poxviridae family.

Multiple choice

Which of the following are bacterial diseases?

  1. SARS
  2. Hepatitis B
  3. Kawasaki disease
  4. Plague
  5. Diphtheria Select the correct answer using codes given below:

  1. 1 and 2

  2. 1, 3 and 5

  3. 2, 3 and 4

  4. 3, 4 and 5

  5. 4 and 5
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Plague is a deadly infectious disease that is caused by enterobacteria Yersinia pestis. Diphtheria is an upper respiratory tract illness caused by Corynebacterium diphtheriae, a facultative anaerobic and gram-positive bacterium.

Multiple choice

Which of the following are examples of sexually transmitted infections caused by bacteria in humans?

  1. Gonorrhoea
  2. Trichomoniasis
  3. Syphilis
  4. Chlamydia infection Select the correct answer using codes given below:

  1. 1 and 2

  2. 1, 2 and 3

  3. 1, 3 and 4

  4. 1, 2, 3 and 4

  5. 2, 3 and 4
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Gonorrhoea is a common human sexually transmitted infection caused by the bacterium Neisseria gonorrhoeae. Syphilis is a human sexually transmitted infection caused by bacterium Treponema pallidum. Chlamydia infection is a common sexually transmitted infection in humans caused by the bacterium Chlamydia trachomatis.

Multiple choice

Which of the following diseases is caused by a DNA virus?

  1. Hepatitis A

  2. Hepatitis B

  3. Hepatitis C

  4. Hepatitis D

  5. Hepatitis E
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hepatitis B is an infectious illness of the liver caused by the hepatitis B virus. Hepatitis B virus is a DNA virus and is enveloped. The DNA is only partly double stranded and forms a circle of around 3,200 bases.

Multiple choice

Which of the following is a pair of diseases caused by gram-positive bacteria?

  1. Gonorrhoea and Typhoid

  2. Cholera and Botulism

  3. Typhoid and Listeriosis

  4. Gonorrhoea and Cholera

  5. Botulism and Listeriosis
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Botulism is a rare and potentially fatal paralytic illness caused by a toxin produced by Clostridium botulinum (Gram-positive bacterium). Listeriosis is a bacterial infection most commonly caused by Listeria monocytogenes (Gram-positive bacterium).

Multiple choice

Which of the following diseases is/are caused by virus(es) with single stranded RNA genome?

  1. Rabies
  2. Dengue
  3. Polio

Select the correct answer using codes given below:

  1. 1 only

  2. 2 only

  3. 3 only

  4. 1, 2 and 3

  5. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rabies virus is a neurotropic virus that causes rabies in humans and animals. These viruses are enveloped and have a single stranded RNA genome with negative-sense. Dengue virus single stranded RNA virus of the family Flaviviridae. Poliovirus is composed of an RNA genome and a protein capsid. The genome is a single-stranded positive-sense RNA genome.

Multiple choice

Which of the following is a set of non-communicable diseases?

  1. Albinism, hemophilia, asthma and glaucoma

  2. Albinism, hemophilia, tuberculosis and glaucoma

  3. Albinism, hemophilia, asthma and tetanus

  4. Amoebiasis, hemophilia, asthma and glaucoma

  5. Albinism, gonorrhea, asthma and glaucoma
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Albinism, hemophilia, asthma, glaucoma: All are non-communicable diseases. Albinism is a rare group of genetic disorders that cause the skin, hair, or eyes to have little or no colour. Hemophilia is a group of inherited blood disorders in which the blood does not clot properly. Asthma is a chronic and non-communicable lung condition. Glaucoma is a chronic and non-communicable disease that causes damage to eye's optic nerve.

Multiple choice

Tuberculosis is caused by

  1. bacteria

  2. virus

  3. fungus

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

Tuberculosis (TB) is an infectious disease caused by the bacterium Mycobacterium tuberculosis. It primarily affects the lungs.

Multiple choice

Polio is caused by

  1. protozoa

  2. virus

  3. fungus

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

Polio is caused by the poliovirus, which is a highly infectious virus that can invade the nervous system.