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

Which of the following statements does NOT characterise the life cycle of P. falciparum in the female Anopheles mosquito?

  1. The sporozoites complete their differentiation in the salivary glands of mosquito.

  2. Immature sporozoites break through the oocyst wall into the haemolymph.

  3. The ookinete is an invasive form of P. falciparum within the mosquito.

  4. During the ookinete stage, genetic recombination can occur.

  5. The ookinete is the only haploid stage of P. falciparum.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Fertilisation of the female gamete by the male gamete occurs rapidly after gametogenesis.

Multiple choice

The parasitic protozoan capable of developing immediately beneath the brush-border of the intestinal epithelium after infection is

  1. acroeimeriaa

  2. eimeria

  3. hemiptera

  4. anthemosoma

  5. ascetosporea
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Acroeimeria is a genus of protozoan parasite that contains those parasites which initially develop immediately beneath the brush-border of the intestinal epithelium, but the meronts and gamonts of which are early on extruded to form a layer on the surface of the gut mucosa.

Multiple choice

Which one of the following pairs is not correctly matched?

  1. Ascaris lumbricoides: Round worm

  2. Enterobius vermicularis: Pin worm

  3. Dracunculus medinensis: Filarial worm

  4. Plasmodium vivax: Malarial Parasite
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Dracunculus medinensis is the Guinea worm, not a filarial worm (which are typically Wuchereria species). The other pairs are correctly matched.

Multiple choice

Which of the following causes kala-azar?

  1. Mosquitoes

  2. Rat-flea

  3. Sand-fly

  4. Tsetse-fly
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Kala-azar (visceral leishmaniasis) is a disease caused by Leishmania parasites, which are transmitted to humans through the bite of an infected sand-fly.

Multiple choice

The causative agents of which of the following sets of diseases are carried by insects?

  1. African horse sickness, babesiosis and leishmaniasis

  2. African horse sickness, crimean fever and malaria

  3. Babesiosis, malaria and bubonic plague

  4. Leishmaniasis, caliciviridae and capillariasis

  5. Crimean fever, caliciviridae and bubonic plague
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because causative agents of all these diseases are carried by insects.

Multiple choice

Which of the following diseases infects horses, donkeys and zebras and causes death due to disorders of the central nervous system?

  1. Venezuelan haemorrhagic fever

  2. Viral pneumonia

  3. Yersinia pseudotuberculosis infection

  4. Venezuelan equine encephalitis

  5. Vibrio parahaemolyticus
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Venezuelan equine encephalitis causes infection in horses, donkeys and zebras. They suddenly die due to disorders of the central nervous system.

Multiple choice

Nutrition in the causative agent of malaria is

  1. saprotrophic

  2. phagotrophic

  3. mixotrophic

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

 Parasite is an organism that lives on or in an organism of another species, known as the host, from the body of which it obtains nutriment. Nutrition in the causative agent of malaria is parasitic.

Multiple choice

Sleeping sickness is caused by

  1. Trypanosoma

  2. Trichonympha

  3. Trichomonas

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

 Sleeping sickness is caused by two germs (protozoa), Trypanosoma brucei rhodesiense and Trypanosomoa brucei gambiense . The more severe form of the illness is caused by T. b. rhodesiense .

Multiple choice

Kala Azar Fever is caused by

  1. Trypanosoma

  2. Leishmania

  3. Plasmodium

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

 Visceral leishmaniasis (VL), also known as kala-azar, black fever, and Dumdum fever, is the most severe form of leishmaniasis. Leishmaniasis is a disease caused by protozoan parasites of the Leishmania genus.

Multiple choice

In women, Leucorrhoea disease is caused by

  1. Trichonympha

  2. Trichomonas

  3. Leishmania

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

 Leucorrhoea, also known as vaginal discharge is a very common condition that has been experienced by most women of all ages, at some time or the other. Leucorrhoea is cuased by trichomonads, a group of parasitic protozoan specifically Trichomonas vaginalis.