Tag: useful and harmful microbes

Questions Related to useful and harmful microbes

Dengue fever is transmitted by

  1. Aedes aegypti

  2. Culex fatigans

  3. Anopheles

  4. Aedes donovoni


Correct Option: A
Explanation:

Dengue fever is a mosquito-borne disease caused by the dengue virus. There is a characteristic skin rash that is similar to measles. It is transmitted by several species of mosquito within the genus Aedes, mainly Aedes aegypti.
Therefore, the correct answer is option A.

The vector of 'break bone fever' is

  1. Culex

  2. Aedes

  3. Anopheles

  4. None of the above


Correct Option: B
Explanation:

Break bone fever is another name for dengue fever. It is a mosquito-borne tropical disease caused by the dengue virus. It is transmitted by several species of the mosquito within the genus Aedes aegypti.
Therefore, the correct answer is option B.

Influenza is caused by 

  1. Virus

  2. Bacteria

  3. Algae

  4. Fungus


Correct Option: A
Explanation:

Influenza is commonly known as 'flu' and is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness and at times can lead to death. The best way to prevent the flu is by getting a flu vaccination each year.

Dengue is transmitted by

  1. Aedes

  2. Male Anopheles

  3. Female Anopheles

  4. Tsetse fly


Correct Option: A
Explanation:

Aedes aegypti, the principal mosquito vector of dengue viruses is an insect closely associated with humans and their dwellings. People not only provide the mosquitoes with blood meals but also water-holding containers in and around the home needed to complete their development. The mosquito lays her eggs on the sides of containers with water and eggs hatch into larvae after a rain or flooding. A larva changes into a pupa in about a week and into a mosquito in two days. 

Match the following with refernce to the insects and diseases.

List I List II
(A) Aedes (I) Dermatobiasis
(B) Cimex (II) Typhoid
(C) Psorophora (III) Encephalitis
(D) Musca (IV) Bubonic plague
(V) Break bone fever

Identify the sequence of list II with respect to List I.

  1. A- (V), B- (I), C- (III), D- (II)

  2. A- (IV), B- (V), C- (III), D- (I)

  3. A- (V), B- (IV), C- (I), D- (II)

  4. A- (V), B- (IV), C- (II), D- (I)


Correct Option: A
Explanation:

The Aedes aegypti mosquito can transmit the viruses that cause dengue fever or breakbone fever.
Psorophora columbiae mosquito is a known vector of encephalitis.
Diseases carried by house flies (musca domestica) include typhoid, cholera and dysentery.
Cimex (bed bug) causes dermatobiasis.

Which of the following microorganisms causes ringworm?

  1. Bacteria

  2. Protozoa

  3. Fungi

  4. Virus


Correct Option: C
Explanation:

Ringworm is a skin infection which is characterized by the formation of a ring-like a pattern in the rash. It is caused by the fungal species name Tenia. The ringworm infection can occur in different parts of the body like feet, armpits, scalp, thighs, groin, etc.

Thus, the correct answer is option C. 

Which of these pathogens causes ringworm and athlete's foot?

  1. Protozoa

  2. Bacteria

  3. Fungi

  4. Algae


Correct Option: C
Explanation:

Athlete's foot and ringworm are caused by fungus. They are collectively known as tinea. Ringworm is caused by a worm known as ringworm. It is characterised by ring-like red patches on the skin.

Athelete foot is mainly caused in between the fingers of the toes due to excessive sweating or moisture.
So, the correct answer is option C.

One of the common fungal disease of man is

  1. Cholera

  2. Plague

  3. Typhoid

  4. Ring worm


Correct Option: D
Explanation:

  • Ringworm is actually a skin infection caused by fungus. No worms involved. The name “ringworm” probably comes from the rash that many people see. On the skin, the rash often has a ring-shaped pattern and a raised, scaly border that snakes its way around the edge like a worm. Ringworm is common.
  • Cholera is an infectious disease that causes severe watery diarrhoea, which can lead to dehydration and even death if untreated. It is caused by eating food or drinking water contaminated with a bacterium called Vibrio cholerae.
  • Typhoid fever, also known simply as typhoid, is a bacterial infection due to a specific type of Salmonella that causes symptoms.
  • Plague is a disease that affects humans and other mammals. It is caused by the bacterium, Yersinia pestis. Humans usually get plague after being bitten by a rodent flea that is carrying the plague bacterium or by handling an animal infected with the plague.

So, the correct answer is 'Ringworm'.

Ringworm is a ___________ disease.

  1. Fungal

  2. Bacterial

  3. Viral

  4. Nematode


Correct Option: A
Explanation:

Ringworm is a fungal disease caused by the mold-like fungus that grows on the skin, nails, and scalp of humans. It is contagious and spreads by sharing of articles and skin contact. 

Hence, the correct answer is 'Fungal'

Causative agent of ringworm s:

  1. Corynebacterium

  2. Microsporum

  3. Clostridium

  4. Salmonella


Correct Option: B
Explanation:

Ringworm is a fungal infection of the skin. Typically it results in red, itchy, scaly, circular each. The causative agent of ringworm is Trichophyton, Microsporum, etc.


So the correct option is "Microsporum".