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 not covered under any special disease control programme of the Govt. of India?

  1. Malaria

  2. Dengue

  3. Chikungunya

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

Heart attack is a cardiovascular condition, not an infectious disease. Malaria, Dengue, and Chikungunya are vector-borne diseases covered under the National Vector Borne Disease Control Programme (NVBDCP). The government runs special disease control programmes only for infectious and communicable diseases, not for lifestyle or chronic conditions like heart attacks.

Multiple choice

Which of the following is caused by a virus?

  1. T. B.

  2. Typhoid

  3. Diphtheria

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

Polio (poliomyelitis) is caused by the poliovirus, which is a virus that attacks the nervous system. Tuberculosis (T.B.) is caused by the bacterium Mycobacterium tuberculosis. Typhoid is caused by the bacterium Salmonella typhi. Diphtheria is caused by the bacterium Corynebacterium diphtheriae. Only polio among these options is a viral disease.

Multiple choice

Assertion (A): Some mycoplasmas (PPLO’S) are named as L-forms. Reason (R): L-forms can be obtained by treating the bacterial cultures with enzymes like lysozyme or an antibiotic such as penicillin.

Directions: In the following question, there are two statements: Assertion (A) and Reason (R). Consider both the statements independently and mark your answer as: 

1. If A and R both are correct and R is the correct explanation of A
2. If A and R both are correct and R is not the correct explanation of A
3. If A is correct and R is incorrect
4. If A is incorrect and R is correct
5. If A and R both are incorrect

  1. 1

  2. 2

  3. 3

  4. 4

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

Correct answer:

Both (A) and (R) is correct but (R) is not the correct expalanation of (A).

Some mycoplasmas (PPLO’S) are named as L-forms where ‘L’ stands for Lister Institute. L-forms can be obtained by treating the bacterial cultures with enzymes like lysozyme or an antibiotic such as penicillin. They lyse the cell walls, due to which small spherical bodies resembling mycoplasmas (PPLO'S) are formed.

Multiple choice

Which viral disease can affect nerves and lead to partial or full paralysis?

  1. Tabes dorsalis

  2. Syringomyelia

  3. Facial palsy

  4. Poliomyelitis

  5. Hemiplegia
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In this infectious disease, a specific neurotropic virus causes muscular paralysis by the destruction of the anterior horn cell or the corresponding cell of the spinal cord and medulla respectively. This disease will spread from person to person primarily via. the fecal oral route.

Multiple choice

Which of the following diseases affects the central nervous system?

  1. Mumps

  2. Measles

  3. Rabies

  4. Taeniasis

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

Rabies is a preventable viral disease of mammals and most often transmitted through the bite of a rabid animal. The rabies virus infects the central nervous system, and ultimately causing disease in the brain and can lead to death.

Multiple choice

Which of the following is a communicable disease?

  1. Small pox

  2. Diabetes

  3. Heart attack

  4. Beri beri

  5. Colour blindness
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is a type of communicable or infectious disease caused by some germs. These germs somehow must reach a new healthy person before he can suffer from the disease. The cause of the disease is called pathogen and its transmission from one person to another is called infection. Other common infectious diseases are cholera, malaria, etc.