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 zoology some common diseases diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

Meningo-encephalitis is caused by

  1. Plasmodium

  2. Entamoeba

  3. Trichomonas

  4. Trypanosoma
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Meningoencephalitis is the Inflammation of the brain and surrounding tissues, usually caused by infection.
  • Signs of meningoencephalitis include unusual behavior, personality changes, and thinking problems and Symptoms may include headache, fever, pain in neck movement, light sensitivity, and seizure.
  • Causative organisms include protozoans, viral and bacterial pathogens.
  • The protozoal pathogen responsible for Meningoencephalitis is Trypanosoma.
  • Hence Meningoencephalitis is caused by Trypanosoma.
  • So, the correct answer is 'Trypanosoma'.
Multiple choice zoology some common diseases diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

American trypanosomiasis is also called as

  1. Chagas disease

  2. Dumdum fever

  3. Espundia

  4. Both B and C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Chagas disease, also known as American trypanosomiasis, is a tropical parasitic disease caused by the protist Trypanosoma cruzi. It is spread mostly by insects known as Triatominae, or "kissing bugs".

So, the correct answer is 'Chagas disease'.
Multiple choice zoology some common diseases diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

Entamoeba histolytica infection occurs through

  1. Contaminated water and food

  2. Sweat

  3. Bird droppings

  4. Mosquito bites
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Entamoeba histolytica is an ameba that feeds on cells in the human colon. Infection by Entamoeba histolytica occurs by ingestion of mature cysts in fecally contaminated food, water, or hands.

So, the correct answer is 'Contaminated water and food'.
Multiple choice zoology some common diseases diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

Trypanosoma/Trypanosomiasis is spread by

  1. Housefly

  2. Tse-tse fly

  3. Sand fly

  4. Culex
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • African trypanosomiasis, also known as sleeping sickness is caused by a protozoan parasite called Trypanosoma brucei.
  • Trypanosomiasis is spread by spread by the bite of an infected tsetse fly and is most common in rural areas.
  • Hence Trypanosoma/Trypanosomiasis is spread by Tse-tse fly.
  • So, the correct answer is 'Tse-tse fly'.
Multiple choice zoology some common diseases diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

Causative agent of amoebiasis is

  1. Amoeba proteus

  2. Entamoeba histolytica

  3. Entamoeba coli

  4. Entamoeba gingivalis
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Amebiasis is a disease caused by infection with a parasitic amoeba that, when symptomatic, can cause dysentery and invasive extraintestinal problems. The cause of amebiasis is mainly the protozoan parasite Entamoeba histolytica.

So, the correct answer is 'Entamoeba histolytica'.
Multiple choice zoology some common diseases diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

In patients suffering from sleeping sickness, the critical symptom which may lead to death appears when the parasite invades

  1. Spleen

  2. Heart

  3. Cerebrospinal fluid

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

Sleeping sickness is curable if treatment is given quickly, however, if left untreated the disease is fatal. Once in the second stage of the disease, when the parasite has crossed the blood-brain barrier, treatment becomes much more aggressive with more toxic drugs needed to kill the parasite. So, the correct option is "C" (Cerebrospinal fluid).

Multiple choice zoology some common diseases diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

Which of the following is a protozoan disease?

  1. Malaria

  2. Typhoid

  3. AIDS

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

Protozoan diseases are caused by the organisms belonging to the Kingdom Protista, called Protozoa.

A. Malaria is caused by Plasmodium which is protozoa. It is a protozoan disease.
B. Typhoid is caused by bacteria Salmonella typhi.
C. AIDS is caused by the virus HIV.
D. Cholera is caused by bacteria Vibrio cholerae.
Hence, the correct answer is 'Malaria'

Multiple choice zoology some common diseases diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

Incorrect about Entamoeba histolytica or amoebiasis is:
(a) Parasite of small intestine
(b) Causes dysentery
(c) Houseflies are mechanical carriers
(d) Symptoms include constipation, abdominal pain and cramp.

  1. A

  2. C

  3. A, C

  4. All are correct
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Entamoeba histolytica is a parasite of the large intestine, not the small intestine. Therefore, statement (a) is incorrect.

Multiple choice zoology some common diseases diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

Amoebic dysentery is due to ............... infection

  1. Entamoeba histolystica

  2. Entamoeba gingivalis

  3. Entamoeba hartmanni

  4. Both A and C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Entamoeba histolytica is an endoparasile lives in the large intestine of man. It lives in tissues of caecum and colon of large intestine. The pathogenic form cause amoebiasis and hepatic amoebiasis. Thus, the correct answer is option A.

Multiple choice zoology some common diseases diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

Sleeping sickness is caused by

  1. Trypanosoma

  2. Leishmania

  3. Entamoeba

  4. Plasmodium
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. brucei rhodesiense. Tsetse flies carry the infection. Thus, the correct answer is option A.

Multiple choice zoology some common diseases diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

Trypanosoma causes 

  1. Dysentery

  2. Sleeping sickness

  3. Plague

  4. Malaria
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Human trypanosomiasis, also known as sleeping sickness, is a vector-borne parasitic disease. It is caused by infection with protozoan parasites belonging to the genus Trypanosoma.The common symptoms are fever, headaches, itchiness, and joint pains
So, the correct answer is 'Sleeping sickness'
Multiple choice zoology some common diseases diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

Infective state of Entamoeba histolytica is 

  1. Spore

  2. Tetranucleated cyst

  3. Egg

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

Entamoeba histolytica complete its life cycle in two stage on one host only infective stage and colon invasive trophozoite stage.  In infective stage, infection occurs by the ingestion of tetranucleated cyst through the contaminated food and water. So, the correct answer is option B.

Multiple choice zoology some common diseases diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

Choose the correct statement.

  1. Filariasis occurs by Trichoderma

  2. Housefly is the vector of amoebiasis

  3. Culex acts as vector for malaria

  4. Ascariasis occurs by droplet infection
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  • Filariasis is a parasitic disease caused by an infection with roundworms such as Wuchereria bancrofti.
  • Amoebiasis, also known as amoebic dysentery, is an infection caused by Entamoeba. The housefly transmits pathogens via touch or from bodily fluids, including from their saliva, faeces, vomit, and urine. Housefly act as a vector for amoebic dysentery, typhoid, cholera, Trachoma, tapeworm, roundworm, leprosy, mycoses etc.
  • Malaria is a mosquito-borne infectious disease that affects humans and other animals. The vector for malaria is female Anopheles mosquito.
  • Ascariasis is a disease caused by the parasitic roundworm Ascaris lumbricoides. The source of infection is from objects which have been contaminated with faecal matter containing eggs.
So, the correct answer is 'Housefly is the vector of amoebiasis'.