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 sexually transmitted diseases stds and infertility reproductive health reproduction biology

Which one of the following groups includes all sexually transmitted disease?

  1. AIDS, Syphilis, Cholera

  2. HIV, Malaria, Trichomoniasis

  3. Gonorrhoea, Hepatitis- B, Chlamydiasis

  4. Hepatitis-B, Haemophilia, AIDS
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

All of the diseases like AIDS, Gonorrhoea, hepatitis- B, chlamydiosis, and syphilis are sexually transmitted diseases. While cholera, malaria, hemophilia are water-borne, parasitic and Mendelian disorders respectively.

So the correct option is 'Gonorrhoea, hepatitis- B, chlamydiasis'.

Multiple choice biology the world of microbes medicinal use of microorganisms use of microorganisms in medicine vaccines

Microorganisms are our friends and foes. Some of them are useful for us while some of them are harmful. From the given list sort out useful and harmful actions of microorganisms.
Production of antibiotics, food spoiling, curd preparation, vaccine production, citrus canker.

  1. Useful: Curd preparation, citrus canker, production of antibioticsHarmful: Food spoiling, vaccine production

  2. Useful: Production of antibiotics, curd preparation, vaccine productionHarmful: Food spoiling, citrus canker

  3. Useful: Citrus canker, vaccine production, curd preparationHarmful: Food spoiling, production of antibiotics

  4. Useful: Vaccine production, curd preparationHarmful: Food spoiling, citrus canker, production of antibiotics
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
An antibiotic is a chemical substance that inhibits the growth of bacteria. They hinder the reproductive cycle of the bacteria inside the body of the host.
Lactobacillus is a genus of bacteria, which can convert sugars into lactic acid by means of fermentation. 
A vaccine is a biological preparation that provides active acquired immunity to a particular disease. It has killed or weakened suspension of microorganism which generates the immune response.
Citrus canker is a disease affecting citrus species caused by the bacterium Xanthomonas axopods. The infection causes lesions on the leaves, stems, and fruit of citrus trees, including lime, oranges, and grapefruit. 

Micorganism like fungus releases toxins which spoils the food.
So, the correct answer is option B.

Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

The disease pneumonia in humans which infects the alveoli of the lungs is caused by

  1. Plasmodium

  2. Haemophilus influenzae

  3. Salmonella typhii

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Haemophilus influenzae is a small, pleomorphic bacteria which is the most often cause of pneumonia, a lung infection.
Therefore, the correct answer is option B.

Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

Which of the following diseases is caused by a virus?

  1. Typhoid

  2. Cholera

  3. Influenza

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

Common viral diseases include: chickenpox, flu, influenza, herpes, human immunodeficiency virus (HIV/AIDS), human papilloma virus (HPV), mumps, measles and rubella. Bacteria cause disease by secreting or excreting toxins (as in botulism), by producing toxins internally, which are released when the bacteria disintegrate (as in typhoid), or by inducing sensitivity to their antigenic properties (as in tuberculosis). Other serious bacterial diseases include cholera, diphtheria, bacterial meningitis and syphilis.

Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

What is responsible for diphtheria and influenza?

  1. Virus and bacteria

  2. Bacteria and virus

  3. Bacteria

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

Diphtheria is caused by a bacterium, Corynebacterium diphtheriae. The actual disease is caused when the bacteria release a toxin into a person's body. Diphtheria bacteria live in the mouth, throat, and nose of an infected person and can be passed to others by coughing or sneezing. Influenza, commonly known as the flu, is an infectious disease caused by the influenza virus. The most common symptoms include: a high fever, runny nose, sore throat, muscle pains, headache, coughing, and feeling tired. These symptoms typically begin two days after exposure to the virus and most last less than a week. 

Therefore, the correct answer is option B.

Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

Which of the following diseases is caused by a virus? 

  1. Typhoid

  2. Cholera

  3. Influenza

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

Influenza (also known as the flu) is a contagious respiratory illness caused by influenza virus. Typhoid fever is an acute illness associated with fever caused by the Salmonella typhi bacteria. Cholera is an infectious disease that causes severe watery diarrhoea, caused by bacterium called Vibrio cholerae. Diphtheria is caused by the Corynebacterium diphtheriae bacterium.

Therefore, the correct answer is option C.

Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

Which of the following is a viral infection?

  1. Dipteria

  2. Influenza

  3. Cholera

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

The correct answer is 'influenza'

Influenza is caused by influenza virus whereas dipteria,cholera and typhoid are all bacterial infections caused by Corynebacterium diptheriae, Vibrio cholerae and Salmonella typhi respectively.

Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

Hemorrhagic Septicaemia is caused by ______________.

  1. Pasteurella multocida

  2. Clostridium chauvoei

  3. Both A and B

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

Explanation: It is caused by Pasteurella multocida. Treatment is effective if given in early stage of disease. The nearest Vety officer or paravet of the department should be contacted for treatment and  prevention.

Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

Which of the following is the causative organism of influenza?

  1. Rhinovirus

  2. Myxovirus influenzae

  3. Streptococcus

  4. Salmonella
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Influenza, commonly called 'the flu' is an illness caused by RNA viruses of the family Orthomyxoviridae. For example, Myxovirus influenzae.
  • The most common symptoms include high fever, runny nose, sore throat, muscle pains, headache, coughing, sneezing, and feeling tired.
  • Hence Myxovirus influenzae is the causative organism of influenza.
  • So, the correct answer is 'Myxovirus influenzae'.
Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

............. is an infection of the human beings caused by a virus.

  1. Typhoid

  2. Influenza

  3. Dysentry

  4. Cholera
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Influenza is a viral disease. Influenza virus is of three types, viz; type A, type B and type C. This virus spread even is short distances causing flu-like conditions, fever, runny nose, headache, muscle pain, coughing, etc. 
  • Typhoid is a disease caused by the bacteria named Salmonella typhi. 
  • Dysentery is a gastroenteritis disorder causing diarrhoea. This disorder can be caused by bacteria, viruses, protozoans or parasites. 
  • Cholera is caused by the bacteria named Vibrio cholerae. 
    • So, the correct answer is option B.
Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

Which one of the following is not a bacterial disease?

  1. Cholera

  2. Tuberculosis

  3. Anthrax

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

Causative agent of cholera is Vibrio cholerae. Vibrio cholerae is a bacterium. 
Tuberculosis is caused by bacteria, Mycobacterium tuberculosis.
Anthrax is caused by bacteria Bacillus anthracis. 
Influenza is caused by influenza virus. 

Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

Bacillus haemophilus causes

  1. Influenza

  2. Pneumonia

  3. A form of meningitis in young children

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

Bacillus haemophilus or Bacillus influenzae is a Gram-negative, facultatively anaerobic bacteria that causes influenza disease. It was first described by Richard Pfeiffer during an influenza pandemic. It is usually present in the upper respiratory tract and causes otitis media, epiglottitis, and meningitis.

Thus, the correct answer is 'Influenza.'

Multiple choice biology food production food production and microorganisms microbial products - food, medicines and industrial products uses of microorganisms

Which one of the following is a viral disease of chickens ?

  1. pullorum disease

  2. Ranikhet

  3. mycotic disease

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

Ranikhet disease, also known as new castle disease, is found in young birds. Its symptoms include sneezing, gasping and often  droopiness. The affected birds are depressed with ruffled feathers. Control of Ranikhet disease can be done by sanitary and vaccination measures.

Multiple choice zoology pollution - a rising environmental problem sources of water pollution marine life water pollution

Stiffback and fixed joint disease in human beings is due to

  1. The use of fluoride contaminated water

  2. Bacterial infection

  3. Viral infection

  4. Mycoplasmal and fungal infection
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
 Prolonged exposure to fluoride leads to fluorosis. A disease condition affects teeth and bones where bones become stiff and weak.
So, the correct answer is 'The use of fluoride contaminated water'