Biology · General Awareness

Disease Vectors and Pathogens

844 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 evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

We should not allow mosquitoes to breed in our surroundings because they

  1. Multiply very fast and contaminate food

  2. Are vectors for many diseases.

  3. Bite and cause skin diseases.

  4. Are not important insects.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mosquitoes cause more human suffering than any other organism. Mosquito acts as a vector for the bacteria and viruses, responsible for the diseases such as malaria, dengue, encephalitis and yellow fever etc. When mosquito bites a human it causes severe skin irritation through an allergic reaction to the mosquito's saliva, this is what causes the red bump and itching.

Multiple choice evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

Vector of malarial parasite is____________.

  1. Male Culex

  2. Female Anopheles

  3. Female Aedes

  4. Female Culex
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Malaria is caused by Plasmodium parasites. The parasites are spread to people through the bites of infected female Anopheles mosquitoes, called "malaria vectors."

So, the correct answer is 'Female Anopheles'.
Multiple choice evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

Which of the following pair is correct?

  1. E. Coli - parasitic

  2. Culex - elephantiasis

  3. Bed bug - kala-azar

  4. Plasmodium - sleeping sickness
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Elephantiasis is painful, swelling of the legs and genital organs. It is a classic sign of late-stage disease. It is caused by Culex mosquito which carries filarial worms. 
E.coli lives in our intestine and it is not parasitic.
Kala-azar is a parasitic disease transmitted by the bite of infected female sandflies.
Sleeping sickness is a parasitic disease of humans and other animals. It is caused by protozoa of the species Trypanosoma brucei.
So the correct option is 'Culex- elephantiasis'.
Multiple choice evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

Female Anopheles mosquito is carrier of a pathogen that causes

  1. malaria

  2. dengue

  3. yellow fever

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

Malaria is caused by the toxins produced in the human body by malarial parasite Plasmodium. Malarial parasite is carried from the infected to the healthy persons by the female Anopheles mosquito.

Multiple choice evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

Choose the correct answers from the alternatives given.
In the malarial parasite, oocyst is formed in the:

  1. erythrocytes of man

  2. liver cells of man

  3. stomach wall of the female mosquito

  4. blood of the female mosquito
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The female Anopheles mosquito, when it withdraws blood the infected malarial patient, the male and female gametes enter into the mosquito gut, when the two male and female gametes fuse together and form a zygote, which develops into ookinetes that burrow into the mosquito midgut wall to develop into oocysts.

So, the correct option is 'stomach wall of the female mosquito'.

Multiple choice evs mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease water borne diseases mosquito and human health

Choose the correct answers from the alternatives given.
The vector of sleeping sickness is:

  1. house fly

  2. sand fly

  3. mosquito

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

Trypanosoma brucei rhodesiense and Trypanosoma brucei gambiense are the two parasites causes sleeping sickness. Tsetse flies which acts as a carrier of the infection. 

So, the correct option is 'tsetse fly'.

Multiple choice evs hygiene - a key to healthy life mosquito and human health mosquitoes and malaria diseases caused by mosquitoes contaminated water spreads disease

Mosquito breeding occurs in 

  1. Stagnant water.

  2. Sea.

  3. River.

  4. All of the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Mosquitoes breed in stagnant, standing fresh water oftentimes found around the home. In tin cans, buckets discarded tires and other artificial containers that hold stagnant water. In untended pools, birdbaths, clogged rain gutters, and plastic wading pools that hold stagnant water.

So, the correct answer is 'Stagnant water.'.
Multiple choice biology classification and variation dna - history and structure biotechnology commercial applications of biotechnology

Intererons have been used in the treatment of

  1. Ascariasis

  2. Influenza

  3. Filariasis

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

Interferons (IFNs) are a group of signalling proteins made and released by host cells in response to the presence of several viruses. A virus-infected cell will release interferons causing nearby cells to heighten their anti-viral defences. Interferons are named for their ability to "interfere" with viral replication (multiplication) by protecting cells from virus infections. Hence, interferons are used in the treatment of viral infections such as influenza. Influenza, commonly known as the flu is an infectious disease caused by an influenza virus.

So, the correct answer is 'Influenza'.

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

Dengue fever is transmitted by

  1. Aedes aegypti

  2. Culex fatigans

  3. Anopheles

  4. Aedes donovoni
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

The vector of 'break bone fever' is

  1. Culex

  2. Aedes

  3. Anopheles

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

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

Dengue is transmitted by

  1. Aedes

  2. Male Anopheles

  3. Female Anopheles

  4. Tsetse fly
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 

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'.