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 statements are true regarding 'Trypanosoma gambiense'?

P. Endoparasite of blood and cerebrospinal fluid of man Q. Tse-tse fly acts as a secondary host R. Reserves food material in the form of glycogen S. Reproduces sexually as well as asexually

  1. P and Q

  2. P and S

  3. Q and R

  4. Q and S

  5. R and S
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Reserve food material of Trypanosoma gambiense is in the form of volutin granules. Trypanosoma gambiense reproduces only asexually by binary fission.

Multiple choice

Which of the following statements are false regarding Plasmodium?

P. It is commonly known as malarial parasite. Q. Female Anopheles mosquito serves as a reservoir host for Plasmodium. R. Gametophytes of Plasmodium are formed in the lumen of stomach of a mosquito. S. Zygote of Plasmodium is known as ookinete.

  1. P and Q

  2. P and R

  3. P and S

  4. Q and R

  5. R and S
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This option is correct because monkeys serve as a reservoir host for Plasmodium. Female Anopheles mosquito serves as a vector. Gametophytes of Plasmodium are formed in the RBC of blood of man. Gametes are formed in the lumen of stomach of a mosquito.

Multiple choice

Life cycle(s) of which of the following pathogenic protozoa is/are digenetic?

  1. Entamoeba histolytica
  2. Plasmodium vivax
  3. Trypanosam cruzi

  1. Only 1

  2. Only 2

  3. Only 3

  4. 1 and 2

  5. 2 and 3
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This option is correct because Plasmodium vivax (malaria parasite) completes its asexual part of life cycle in people and the sexual part in the female Anopheles mosquito (digenetic life cycle) and Trypanosam cruzi possesses a digenetic life cycle, involving a hematophagous insect vector and a mammalian host.

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.