Biology · 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 of the following diseases is caused by a DNA virus?

  1. Infectious hepatitis

  2. Serum hepatitis

  3. Hepatitis C

  4. Hepatitis D

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

Serum hepatitis or 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 are examples of human sexually transmitted infection caused by bacteria?

  1. The clap
  2. Trich
  3. Syphilis
  4. Chlamydia

  1. Only 1 and 2

  2. Only 1, 2 and 3

  3. Only 1, 3 and 4

  4. All of these

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

Yes, it is the correct answer. The clap 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 viral diseases is/are caused by double-stranded DNA viruses?

  1. Morbilli
  2. Epidemic parotitis
  3. Varicella disease
  4. Red plague

  1. Only 1 and 2

  2. Only 1 and 3

  3. Only 2 and 3

  4. Only 2 and 4

  5. Only 3 and 4
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Yes, it is the correct answer. Varicella disease (Chickenpox) is caused by the varicella zoster virus (VZV), an enveloped double-stranded DNA virus. Red plague or Smallpox is caused by the variola virus, a double stranded DNA virus of the Poxviridae family.

Multiple choice

Which of the following diseases is/are caused by Gram-positive spore forming bacteria?

  1. Anthrax
  2. Tetanus
  3. Cholera
  4. Typhoid

  1. Only 1 and 2

  2. Only 1 and 3

  3. Only 2 and 3

  4. Only 2 and 4

  5. Only 3 and 4
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yes, it is correct. 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

Match the following diseases with their causative agent and vector |||| |---|---|---| |Disease |Causative agent |Vector| |P. Dumdum fever|i. Plasmodium spp.|1. Tse-tse fly| |Q. African trypanosomiasis|ii. Leishmania donovani|2. Sandfly| |R. Epidemic louse-borne typhus|iii. Trypanosoma brucei |3. Mosquito| |S. Malaria|iv. Rickettsia prowazekii|4. Body louse|

  1. P-ii-3, Q-iv-1, R-i-2, S-iii-4

  2. P-iii-1, Q-iv-2, R-ii-4, S-i-3

  3. P-i-2, Q-ii-4, R-iii-2, S-iv-3

  4. P-ii-2, Q-iii-1, R-iv-4, S-i-3

  5. P-i-4, Q-iii-1, R-ii-3, S-iv-2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Yes, it is correct. Dumdum fever is caused by Leishmania donovani and transmitted by the bite of the sand fly. African trypanosomiasis (also known as sleeping sickness) is caused by Trypanosoma brucei and transmitted by the tse-tse fly. Epidemic louse - borne typhus is caused by Rickettsia prowazekii and transmitted by the human body louse (Pediculus humanus corporis). Malaria is a mosquito - borne infectious disease of humans and other animals caused by parasites of the Plasmodium spp.

Multiple choice

Which of the following is caused by bacteria?

  1. Small pox

  2. Dysentery

  3. Influenza

  4. Cholera

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

Cholera is caused by the bacterium Vibrio cholerae. Smallpox and influenza are caused by viruses, and dysentery can be caused by either bacteria or amoebae, but cholera is the classic bacterial example here.

Multiple choice

Which of the following statements regarding Bird Flu Virus is/are correct?I. Bird flu is an infection caused by influenza (flu) virus.II. Domesticated birds worldwide carry the viruses in their intestines, but usually do not get sick from them.III. H5N1 is one of the few bird flu viruses to infect humans, and it is the most deadly of those that have crossed the barrier.

  1. Only I

  2. Only II

  3. Only III

  4. Both I and II

  5. Both I and III
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Both the statements are correct, hence this is the correct answer option.

Multiple choice

__________ is commonly called flu.

  1. Hepatitis

  2. Delta agent

  3. Influenza

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

Influenza, commonly called the flu, is an acute, contagious, respiratory tract infection, which is caused by one of the influenza viruses. The severity of influenza symptoms depends on the type of influenza virus, and the age and health of the patient. Influenza may produce no symptoms, mild-to severe symptoms, or fatal illness.

Multiple choice

Which one of the following is known as the 'silent killer'?

  1. Leprosy

  2. Tuberculosis

  3. Hypertension

  4. Hepatitis-B

  5. Malaria
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hypertension is widely known as the silent killer because it often presents no symptoms until it causes severe damage to the heart, brain, or kidneys. Other diseases listed typically present with noticeable symptoms.

Multiple choice

Match the following:

 
Human diseases Method of spreading
a. Common cold 1. taking infected food or water
b. Cholera 2. sharing infected needles, injections or by sexual contact with the infected person
c. AIDS 3. breathing air containing microorganisms

  1. a - 3, b - 1, c - 2

  2. a - 3, b - 2, c - 1

  3. a - 2, b - 1, c - 3

  4. a - 2, b - 3, c - 1

  5. a - 1, b - 3, c - 2
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is the correct option. Common cold spreads by breathing air containing microorganisms. Cholera spreads by taking infected food or water. AIDS spreads by sharing infected needles, injections or by sexual contact with the infected person.