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 are incorrect regarding Plasmodium vivax?

P. The duration of exoerythrocytic cyle is 14-15 days. Q. The duration of erythrocytic cyle is 48 hours. R. Incubation period is 20-24 days. S. The duration of sexual cycle is 10 days.

  1. P and Q

  2. P and R

  3. P and S

  4. Q and R

  5. Q and S
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct because the duration of exoerythrocytic cyle is 8 days in Plasmodium vivax, while it is 14-15 days in Plasmodium malariae. Incubation period is 12-14 days in Plasmodium vivax, while it is 20-24 days in Plasmodium malariae.

Multiple choice

Which is the largest and the most common parasitic worm in humans?

  1. Entamoeba histolytica

  2. Ascaris lumbricoides

  3. Plasmodium

  4. Giardia lamblia

  5. Amoeba
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ascaris lumbricoides is the largest nematode (roundworm) parasitising the human intestine. Ascariasis is a disease of humans caused by the parasitic roundworm Ascaris lumbricoides.

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

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.