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

Malaria is a disease caused by

  1. virus

  2. bacteria

  3. protozoa

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

Malaria is caused by Plasmodium parasites, which are single-celled microorganisms known as protozoa. It is transmitted to humans through the bites of infected female Anopheles mosquitoes.

Multiple choice

Which of the following causes kala-azar?

  1. Mosquitoe

  2. Rat flea

  3. Sand fly

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

Kala-azar, also known as visceral leishmaniasis, is caused by Leishmania parasites and is transmitted to humans through the bite of an infected female sand fly.

Multiple choice

The primary host of Taenia solium is:

  1. Pig

  2. Human

  3. Female Anopheles mosquito

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

It is the primary host of Taenia solium .It is a parasite in the small intestine

Multiple choice

What does Balantidium coli cause?

  1. Trypanosomiasis

  2. Cholera

  3. Ciliary dysentry

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

It is present in human intestine and feeds on RBCs, tissue fragments undigested food and bacteria.

Multiple choice

Which organ is affected by the malaria?

  1. Stomach

  2. Intestine

  3. Liver

  4. Spleen

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Malaria is a disease caused by Plasmodium parasites that infect red blood cells and the liver. The spleen is significantly affected because it works to filter out the damaged and infected red blood cells, which often leads to its enlargement (splenomegaly). While the liver is also involved, the spleen is a classic clinical indicator of the disease's impact.

Multiple choice

Match the following diseases with their causative agents and vectors.

   
Disease
Causative agent
Vector
P. Kala azar i. Plasmodium spp. 1. Tse-tse fly
Q. African sleeping sickness ii. Leishmania donovani 2. Sand fly
R. Epidemic typhus iii. Trypanosoma brucei 3. Mosquito
S. Malaria iv. Rickettsia prowazekii 4. Body louse

  1. P - ii - 3, Q - iv - 1, R - i - 2, S - iii - 4

  2. P - iii - 1, Q - iv - 2, R - ii - 4, S - i - 3

  3. P - i - 2, Q - ii - 4, R - iii - 2, S - iv - 3

  4. P - ii - 2, Q - iii - 1, R - iv - 4, S - i - 3

  5. P - i - 4, Q - iii - 1, R - ii - 3, S - iv - 2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Kala azar is caused by Leishmania donovani and transmitted by the bite of sand fly. African Trypanosomiasis (also known as sleeping sickness) is caused by Trypanosoma brucei and transmitted by tse-tse fly. Epidemic typhus is caused by Rickettsia prowazekii and transmitted by the human body louse (Pediculus humanus corporis). Malaria is a mosquito-borne infectious disease of humans and other animals caused by parasites of Plasmodium spp.

Multiple choice

Malaria is caused by

  1. bacteria

  2. virus

  3. protozoa

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

Malaria is a disease caused by parasitic protozoa of the genus Plasmodium. It is transmitted to humans through the bite of an infected Anopheles mosquito.

Multiple choice

Bird Flu has spread to new areas of which of the following states

  1. Meghalaya

  2. Assam

  3. Tripura

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

Bird flu (avian influenza) primarily spreads to Assam among the given options. Assam has experienced multiple outbreaks of bird flu, particularly affecting poultry. The northeastern region including Assam is vulnerable due to migratory bird routes and poultry farming practices. While other states have also had outbreaks, Assam has been frequently affected.

Multiple choice

Chagas disease is an inflammatory, infectious disease caused by a parasite found in the faeces of the triatomine (reduviid) bug. Which of the following trypanosoma species has been proposed for the prevention of Chagas disease?

  1. Trypanosoma rangeli

  2. Trypanosoma suis

  3. Trypanosoma irwini

  4. Trypanosoma brucei

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

Trypanosoma rangeli is considered non pathogenic in humans. It has been proposed for the prevention of Chagas disease.