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

Through its bite, tse-tse fly (Glossina) transmits

  1. Trypanosoma gambiense

  2. Plasmodium falciparum

  3. Leishmanis donovani

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

Trypanosomiasis is most serious protozoan disease caused by a flagellate protozoan, Trypanosomiasis gambiense. It is found firstly in blood, than in lymph and finally in the cerebrospinal vfluid of man. Its secondary host is a blood sucking insect Glossina (tse-tse fly). Wuchereria bancrofti causes filariasis or elephantiasis in man. 

Multiple choice

Cerebral malaria is caused by

  1. Plasmodium vivax

  2. Plasmodium ovale

  3. Plasmodium malariae

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

Type of Malaria                                               Pathogen Cerebral malaria             -                      Plasmodium falciparum Benign tertian malaria     -                      Plasmodium vivax Quartan malaria             -                      Plasmodium malariae Oval malaria                  -                      Plasmodium ovale 

Multiple choice

Schizont stages of malarial parasite in man are found in

  1. Erythrocytes

  2. Erythrocytes and liver cells

  3. Erythrocytes, liver and spleen

  4. Erythrocytes, brain and liver cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sporozoites are carried by the blood to the liver, where they mature into forms known as schizonts.

Multiple choice

Where will you look for the sporozoites of the malarial parasite?

  1. Red blood corpuscles of human suffering from malaria

  2. Spleen of infected humans

  3. Salivary glands of freshly moulted female Anopheles mosquito

  4. Salivary glands of freshly moulted female Anopheles mosquito
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sporozoites are the infective stage of malarial parasite. They are present in the saliva of infected femaleAnopheles mosquito. This infective stage is directly goes to parenchyma cells of liver.

Multiple choice

Filaria is caused by a worm called

  1. Trichinella spiralis

  2. Wuchereria bancrofti

  3. Ancylostoma duodenale

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

Wuchereria bancrofti is a nematode which infects the lymphatic system causing swelling of certain body parts in humans.

Multiple choice

Which of the following set of diseases are caused by the protozoans?

  1. Kala-azar, poliomyelitis, chikungunya, amoebiasis

  2. Influenza, poliomyelitis, mumps, chikungunya

  3. Measles, giardiasis, ascariasis, AIDS

  4. Anthrax, malaria, tuberculosis, diphtheria

  5. Kala-azar, giardiasis, balantidiasis, malaria,
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Balantidiasis is a protozoan infection caused by infection with Balantidium coli. Malaria parasites belong to the genus Plasmodium (protozoan). Kala-azar (Leishmaniasis) is caused by Leishmania donovani (protozoan). Giardiasis is caused by microscopic protozoan parasites known as Giardia intestinalis.

Multiple choice

Which of the following set of diseases are caused by nematodes?

  1. Trypanosomiasis, giardiasis, ascariasis, amoebiasis

  2. Trypanosomiasis, balantidiasis, enterobiasis, filariasis

  3. Filariasis, ascariasis, ancylostomiasis, enterobiasis

  4. Filariasis, balantidiasis, ancylostomiasis, tuberculosis

  5. Filariasis, giardiasis, ancylostomiasis, trypanosomiasis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

All are caused by nematodes. Ascariasis is an infection caused by Ascaris lumbricoides, giant roundworm of humans belonging to the phylum Nematoda. Ancylostomiasis is the condition of infection by Ancylostoma hookworms. Enterobiasis (pinworm infection) is caused by a small, thin, white roundworm called Enterobius vermicularis. Wuchereria bancrofti is a human parasitic roundworm that is the major cause of filariasis.

Multiple choice

In which of the following sets of diseases, Aedes aegypti is a carrier?

  1. Breakbone fever, yellow plague, chikungunya

  2. Breakbone fever, malaria, yellow plague

  3. Breakbone fever, malaria, nervous fever

  4. Malaria, gastric fever, chikungunya

  5. Slow fever, chikungunya, yellow fever
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Aedes aegypti is a mosquito that can spread the breakbone fever, yellow plague and chikungunya, apart from other diseases.

Multiple choice

Malaria and yellow fever germs are carried by

  1. birds

  2. flies

  3. mosquitoes

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

Mosquitoes act as vectors for various diseases, including malaria (Anopheles) and yellow fever (Aedes). They transmit the pathogens by biting humans and transferring the germs through their saliva.