Biology · General Awareness

Disease Vectors and Pathogens

820 Questions

Disease vectors and pathogens examine how organisms like Plasmodium and Leishmania transmit infections. Test items require matching vectors to specific diseases. Studying these life cycles is essential for scoring well.

Plasmodium infective stagesDisease transmission modesDisease vectors and fleasIntracellular parasitesElephantiasis causes

Disease Vectors and Pathogens Questions

Multiple choice biology living world and classification of microbes pathogen and their mode of transmission economic importance of bacteria and fungi diseases and immunity classification of microbes useful and harmful microbes harmful microorganisms five kingdoms of living organisms

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)
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice biology living world and classification of microbes pathogen and their mode of transmission economic importance of bacteria and fungi diseases and immunity five kingdoms of living organisms

The vector carrying virus which causes yellow fever in humans is a

  1. Mosquito

  2. Bug

  3. Louse

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

Yellow fever is an acute viral fever caused by a flavivirus. It is transmitted by the bite of mosquitoes, usually the Aedes aegypti mosquito. It is characterized by a headache, chills, loss of appetite, nausea etc. In severe cases, yellow fever causes a high fever, bleeding into the skin and the death of cells in the liver and kidneys. Liver damage results in severe jaundice i.e., yellowing of the skin; hence the name "yellow fever". Thus, the correct answer is option A.

Multiple choice animal diseases economic importance of bacteria and fungi bacteria keeping diseases away biology

'Plague' is transmitted by

  1. Housefly

  2. Tsetse fly

  3. Rat flea

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

Plague is a deadly infectious disease, that is caused by the enterobacteria Yersinia pestis. Contrary to popular belief, rats did not directly start the spread of the bubonic plague. It is mainly a disease in the fleas (Xenopsylla cheopis), that infested the rats, making the rats themselves the first victims of the plague. Infection in a human occurs, when a person is bitten by a flea that has been infected by biting a rodent that itself has been infected by the bite of a flea carrying the disease. The bacteria multiply inside the flea, sticking together to form a plug that blocks its stomach and causes it to starve. The flea then bites a host and continues to feed, even though it cannot quell its hunger, and consequently the flea vomits blood tainted with the bacteria back into the bite wound.

Multiple choice bio-chemistry immunology fungal diseases fungal, protozoan and worm diseases useful and harmful microbes

Ringworm infection is caused by 

  1. Wuchereria

  2. Trichophyton

  3. Ascaris

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

Trichophyton is a genus of fungi which includes the parasitic diseases that cause athlete's foot, ringworm, jock itch, and similar infections of the nail, beard, skin and scalp. Dermatophytosis, also known as ringworm is a fungal infection of the skin. Typically it results in a red, itchy, scaly, circular rash. Hair loss may occur in the area affected. Ringworm can spread from other animals or between people.

So, the correct answer is 'Trichophyton'.

Multiple choice

Which of the following is a parasite?

  1. Zebra

  2. Wolves

  3. Ringworm

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

A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host. Ringworm is a fungal infection that acts as a parasite on human or animal skin.

Multiple choice sexually transmitted diseases stds and infertility reproductive health reproduction biology

Sexually transmitted disease caused by protozoa is 

  1. Candidiasis

  2. Chlamydiasis

  3. Giardiasis

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

Candidiasis is a fungal infection typically on skin or mucous membranes caused by candida . While , Chlamydiasis is a common STD spread by bacteria .Giardiasis is an infection that is caused by a parasite , Giardia lambia .On the other hand , genital warts are small bumps on the genitals caused by a common sexually transmitted infection .
So , the correct option is 'Giardiasis'  .
Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

Dengue is caused by 

  1. <p>Female Anopheles</p>

  2. <p>Female Aedes</p>

  3. Male Anopheles

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Dengue fever is a mosquito-borne tropical disease caused by the dengue virus. Dengue is spread by several species of a mosquito of the female Aedes type, principally Aedes aegypti. Symptoms include high fever, headache, vomiting, muscle and joint pains, characteristic skin rash, bleeding, low levels of blood platelets and blood plasma leakage. So, the correct answer is 'Female Aedes'.

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

Aedes spreads 

  1. Malaria

  2. Dengue

  3. Sleeping sickness

  4. Kala-azar
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Dengue fever is a mosquito-borne tropical disease caused by the dengue virus. Dengue is spread by several species of a mosquito of the  Aedes Type, principally A.aegypti.
  • Symptoms typically begin three to fourteen days after infection.[2] This may include a high fever, headache, vomiting, muscle and joint pains, and a characteristic skin rash
  • Arbovirus is an informal name used to refer to any viruses that are transmitted by arthropod vectors. As dengue is transmitted by an arthropod vector(mosquito) its causative organism is called arbovirus. Hence Aedes spreads Dengue'.
  • So,the correct answer is 'Dengue'.
Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

The disease not transmitted by house-fly is 

  1. Dysentery

  2. Cholera

  3. Enteric fever

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

House flies are strongly suspected of transmitting at least 65 diseases to humans, including typhoid fever, dysentery, cholera, poliomyelitis, anthrax, tularemia, leprosy and tuberculosis. Flies regurgitate and excrete wherever they come to rest and thereby mechanically transmit disease organisms. Dengue is transmitted by mosquito.

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

Aedes mosquito is a vector for

  1. Plague

  2. Malaria

  3. Filaria

  4. Encephalitis and Dengue
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Aedes is a genus of mosquitoes originally found in tropical and subtropical zones but now found on all continents except Antarctica. Some species of this genus (like Aedes albopictus and Aedes aegypti) transmit serious diseases, including dengue fever, yellow fever, eastern equine encephalitis and chikungunya. So, the correct answer is option D.

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

Dengue fever is spread by

  1. Anopheles

  2. Aedes

  3. Culex

  4. Musca.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Dengue fever is spread through the bite of the female mosquito (Aedes aegypti). 
  • The mosquito becomes infected when it takes the blood of a person infected with the virus. After about one week, the mosquito can then transmit the virus while biting a healthy person.
  • Hence Dengue fever is spread by Aedes.
  • So, the correct answer is 'Aedes'.
Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

Aedes is vector of

  1. Plague

  2. Malaria

  3. Filaria

  4. Encephalitis and Dengue.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • A disease vector is an agent who carries and transmits an infectious pathogen into another living organism.
  • Aedes mosquito is known to transmit dengue virus, yellow fever virus, chikungunya virus, Zika virus and Encephalitis(inflammation of the brain).
  • It can be recognized by white markings on its legs and a marking in the form of a lyre on the upper surface of its thorax.
  • Hence Aedes is a vector of 'Encephalitis and Dengue'.
  • So, the correct answer is 'Encephalitis and Dengue'.
Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

Aedes is the carrier of

  1. Dengue fever

  2. Relapsing fever

  3. Malaria

  4. None of the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The dengue virus is transmitted to humans via the bite of an infected mosquito. Only a few mosquito species are vectors for the dengue virus. The dengue virus is carried and spread by mosquitoes in the genus Aedes, which includes a number of mosquito species. Of these species, the primary vector of the dengue virus is the species Aedes aegypti.

So, the correct answer is 'Dengue fever'.
Multiple choice classification of microbes living world and classification of microbes useful and harmful microbes harmful microorganisms biology

Aedes aegypti is vector of

  1. Yellow fever

  2. Dengue fever

  3. Both A and B

  4. Japanese encephalitis.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
  • A disease vector is an agent who carries and transmits an infectious pathogen into another living organism.
  • Aedes aegypti is known to transmit dengue virus, yellow fever virus, chikungunya virus, and Zika virus.
  • It can be recognized by white markings on its legs and a marking in the form of a lyre on the upper surface of its thorax.
  • Hence Aedes aegypti is a vector of Yellow fever and Dengue fever.
  • So, the correct is 'Both A and B'.