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

Which of the following causes sleeping sickness?

  1. Trichomonas Vaginalis

  2. Entamoeba histolytica

  3. Trypanosoma brucei

  4. Leishmania donovani

  5. Leishmania tropica
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is correct answer because sleeping sickness or Trypanosomiasis is caused by Trypanosoma brucei.

Multiple choice

Biological false positive widal is seen in ________________.

  1. malarial infection

  2. myocardial infection

  3. leptospirosis

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

Widal test It is a serological test to diagnose typhoid. It measures H and Q agglutinins for typhoid and paratyphoid bacilli. It is a tube agglutination reaction. Causes of false negative widal are a. Carrier state b. Inadequate amount of bacterium in the host c. Technical errors d.  Previous antibiotic treatment

Multiple choice

Match the following:

   
Disease Causative agent Vector
P. Dumdum fever i. Flavivirus spp. 1. Tse-tse fly
Q. African trypanosomiasis ii. Leishmania donovani 2. Sand fly
R. Jail fever iii. Trypanosoma brucei 3. Mosquito
S. Yellow plague 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

This option is correct because all are correctly matched. Dumdum fever is caused by Leishmania donovani and transmitted by the bite of the sand fly. African Trypanosomiasis is caused by Trypanosoma brucei and transmitted by the tse-tse fly. Jail fever is caused by Rickettsia prowazekii and transmitted by the human body louse (Pediculus humanus corporis). Yellow plague is a mosquito-borne infectious disease of humans and other animals caused by parasites of the Flavivirus spp.

 

Multiple choice

Which of the following is a pair of Helminth disease?

  1. Filariasis and Leucorrhea

  2. Enterobiasis and Tuberculosis

  3. Tuberculosis and Leucorrhea

  4. Enterobiasis and Filariasis

  5. Filariasis and Influenza
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Causative agent of enterobiasis is Enterobius vermicularis (Helminth).
Causative agent of filariasis is Wuchereria bancrofti (Helminth).

Multiple choice

Which of the following is a set of vector borne diseases?

  1. African sleeping sickness, Lyme disease, Cretinism, Malaria

  2. African sleeping sickness, Chancroid, Kala azar, Cretinism

  3. African sleeping sickness, Lyme disease, Kala azar, Malaria

  4. African sleeping sickness, Kala azar, Malaria, Chancroid

  5. Cretinism, Chancroid, Malaria, Kala azar
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

African sleeping sickness is transmitted by tse-tse fly (Glossina palpalis). Lyme disease is caused by an arachnid, the deer tick (Ixodes scapularis), which carries a bacterium called Borrelia bugdorferi. Kala-azar is a vector borne disease. Sandfly of genus Phlebotomus are vectors of kala-azar. Malaria, a life-threatening blood disease caused by a parasitic protozoans of the genus Plasmodium, is transmitted to humans by the female Anopheles mosquito.

Multiple choice

The agent of amoebic dysentery is:

Amoebic dysentery is a frequently occuring disease in humans and other primates. It especially occurs in the tropical areas. If it is not treated timely, it may be serious and in some cases fatal.

  1. Entamoeba histolytica

  2. Toxoplasma

  3. Staphylococcus

  4. Dinoflagellates

  5. Trypanosoma evansi

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

Entamoeba histolytica is an anaerobic, protozoan parasite. It predominantly infects human and other primates.

Multiple choice

The pathogenic stage of the agent causing amoebic dysentery:

Amoebic dysentery is a frequently occuring disease in humans and other primates. It especially occurs in the tropical areas. If it is not treated timely, it may be serious and in some cases fatal.

  1. merozoite

  2. Sporozoite

  3. trophozoite

  4. Cilia

  5. none of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It is the active stage, and exists only in host and in fresh faeces. Cysts survive outside the host in water, in soils and on foods, especially under moist conditions.

Multiple choice

Which of the following conditions though harmful in itself, is a potential saviour from all mosquito borne infectious disease like malaria?

  1. Pernicious anaemia

  2. Hemolytic anaemia

  3. Leukemia

  4. Thalassemia

  5. Sickle cell anaemia
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Sickle cell anemia is a blood disease in which red blood cells reveal an abnormal crescent (or sickle) shape when observed under a conventional microscope. It provides immunity against malaria.

Multiple choice

Match the following:

Causative agent Disease
a. Staphylococci 1. Sleeping sickness
b. Trypanosoma 2. Kala-azar
c. Leishmania 3. Acne

  1. a - 1, b - 2, c - 3

  2. a - 2, b - 1, c - 3

  3. a - 2, b - 3, c - 1

  4. a - 3, b - 2, c - 1

  5. a - 3, b - 1, c - 2
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The correct matching is given below. Staphylococci : the bacteria that can cause acne Trypanosoma : the protozoan that causes sleeping sickness Leishmania : the protozoan that causes kala-azar

Multiple choice

Treponema pallidum is a

  1. prokaryotic commensal

  2. eukaryotic parasite

  3. spirochete

  4. protozoan parasite

  5. mycoplasma
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Treponema pallidum is a spirochete because it is spiral shaped and moves with the help of axial filaments or endo-flagella. It is a prokaryote and a pathogenic spirochete - the causative agent of syphilis in human beings.

Multiple choice

Which of the following is a pair of protozoan diseases?

  1. Chagas’ disease and malaria

  2. Ebola haemorrhagic fever and dengue haemorrhagic fever

  3. Typhoid fever and yellow fever

  4. Cholera and diphtheria

  5. Bubonic plague and rabies
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chagas’ disease is caused by Trypanosoma cruzi (protozoan). Malaria is caused by Plasmodium falciparum (protozoan).