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 biology food through digestive tract role of large intestine in digestion busy at work - our internal organs parts of the digestive system: structure and function

The disease due to inflammation of vermiform appendix of the digestive system is known as

  1. Amoebic dysentery

  2. Appendicitis

  3. Intestinal cancer

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

Appendicitis is an inflammation of the appendix, a finger-shaped pouch that projects from the colon on the lower right of the abdomen.
Therefore, the correct answer is option B.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Which of the following is water borne disease?

  1. Malaria

  2. Cholera

  3. Tuberculosis

  4. Both A and B
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cholera is caused by the bacterium Vibrio cholerae. This bacteria is usually found in food or water contaminated by feces of an infected person. This is most likely to happen when sewage water mixes with a source of drinking water. Drinking water after boiling helps to prevent this infection. Thus the correct answer is option B.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Which of the following causes infectious diseases?

  1. Pollutants

  2. Harmful lifestyle

  3. Inheritance

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

Pollutants are the harmful oxides or chemicals which degrade the quality of the environment and causes pollution. 

Harmful lifestyle affects the metabolic process of the body and leading to severe diseases and also causes ageing.
Inheritance is the transfer of characters from the parents to offsprings. 
Microorganisms are the small microorganism which are not visible to naked eye and carries the pathogens responsible for infectious disease.
So, the correct answer is option D.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Which common disease is also known as hydrobhobia?

  1. Rabies

  2. Dengue

  3. Typhoid

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

Rabies is a viral infection that mainly spreads through a bite from an infected animal. It is an RNA virus of the rhabdovirus family.Once inside the nervous system, the virus produces acute inflammatiom of the brain. Coma and death soon follows. Encephelitus Rabies:This occurs in 80% of human cases. The person is more likely to experience hyperactivity and "hydrophobia".

So, the correct option is A. ( Rabies )

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

A disease spread directly by animal bites is 

  1. Syphilis

  2. Scarlet Fever

  3. Rabies

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

Rabies is a viral disease that causes inflammation of the brain in humans and other mammals. Early symptoms can include fever and tingling at the site of exposure. Other symptoms include violent movements, uncontrolled excitement, fear of water, an inability to move parts of the body, confusion, and loss of consciousness. Rabies virus is typically transmitted to humans by the bite of an infected mammal, often a carnivore or a bat.

So, the correct answer is 'Rabies'.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Disease which affects central nervous system is

  1. Polio

  2. Jaundice

  3. Rabies

  4. Both A and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Rabies is a viral disease that is spread most often from the bite of a rabid animal to another animal or to a human. The rabies virus affects the central nervous system including the brain and spinal cord of humans and animals. During the incubation period, the time between exposure to the virus and the appearance of symptoms, the virus travels along nerves towards the brain. This process takes an average of one to three months, but can range from several days to several years after exposure. The infection causes inflammation of the brain and spinal cord that can lead to encephalopathy and later, death.
Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Hydrophobia is related to

  1. Rabies

  2. Hepatitis

  3. Yellow fever

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

Rabies causes hydrophobia in the encephalitic stage which means when it affects the brain and causes swelling and inflammation of multiple areas of the brain. Hence, it affects the complex swallowing areas in the brain. Initially into the course of the disease, the patient has involuntary contractions of neck muscles when he drinks water. At later stages of disease, the patient starts contracting his muscles even at the thought of water. Rabies virus is a neurotropic virus which means that it travels through nerves because of its preference to attach to acetylcholine receptors in the neurons. 

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Which of the following disease is communicable and 100% fatal if not controlled immediately?

  1. Coronary heart attack

  2. Atherosclerosis

  3. Rabies

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

Rabies is a deadly disease caused by a virus that attacks the central nervous system (brain and spinal cord). Infected mammals can transmit rabies virus to humans and other mammals. Rabies is almost always fatal once symptoms appear. People usually get exposed to the rabies virus when an infected animal bites them. Exposure may also occur if saliva from a rabid animal enters an open cut or mucous membrane (eyes, nose or mouth).

Therefore, the correct answer is option C.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

The disease known as hydrophobia is

  1. Rabies

  2. Tetanus

  3. Syphills

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

Rabies is a viral disease that causes acute inflammation of the brain. Rabies is caused by lyssaviruses including: rabies virus and Australian bat lyssavirus. Rabies is spread when an infected animal scratches or bites another animal or human. Hydrophobia (fear of water) is the historic name for rabies. It refers to a set of symptoms in the later stages of the infection in which the person has difficulty swallowing, shows panic when presented with liquids to drink, and cannot quench his or her thirst. Any mammals infected with the virus may demonstrate hydrophobia. 

Therefore, the correct answer is option A.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Rabies is spread by infected animals to other warm-blooded animals including people through saliva (e.g. biting or licking).

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The rabies virus is transmitted to others through the saliva of the infected animal. All mammals can carry the virus. Humans can contract the virus through a bite from the infected animal, or from a scratch, scrape, open wound, or mucous membrane that comes in contact with the saliva. It is not possible to contract the virus by petting a rabid animal or through contact with the blood, urine, or feces of a rabid animal.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Rabies is caused by

  1. Bacteria

  2. Fungi

  3. Virus

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

Rabies infection is caused by the rabies virus. Domestic dogs, cats, and rabbits, and wild animals, such as skunks, raccoons, and bats, are able to transfer the virus to humans via bites and scratches. The virus causes the inflammation of the brain in humans and mammals. it affects the central nervous system.

Therefore, the correct answer is option C.

Multiple choice biology diseases and immunity pathogen and their mode of transmission classification of microbes infectious diseases

Rabies specific signs is/are

  1. Hydrophobia

  2. Hydrophillia

  3. Fever

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

Rabies is a life-threatening condition that causes tens of thousands of deaths worldwide every year. It’s caused by a virus that attacks the central nervous system. The virus is transmitted to humans via bites and scratches from infected animals. The symptoms of rabies can present themselves just a few days after a bite, or they might take as long as 12 weeks. The common symptoms includes fever, headache, nausea and fear of water due to difficulty in swallowing (hydrophobia), insomnia etc. 

Therefore, the correct answer is option A.