PG TRB ZOOLOGY | Unit I - ANIMAL DIVERSITY AND PHYLOGENY | Structure, life history and disease of Protozoa – Entamoeba histolytica.

PG TRB ZOOLOGY ONLINE TEST / QUIZ AS PER LATEST SYLLABUS | Unit I - ANIMAL DIVERSITY AND PHYLOGENY | Structure, life history and disease of Protozoa – Entamoeba histolytica.

1. Which stage of Entamoeba histolytica is the infective stage for humans?

• a) Trophozoite
• b) Precystic stage
• c) Metacystic trophozoite
• d) Quadrinucleate cyst

2. The movement of Entamoeba histolytica is by...

• a) Cilia
• b) Flagella
• c) Pseudopodia
• d) Contractile vacuole

3. The main site of infection of Entamoeba histolytica in humans is the...

• a) Small intestine
• b) Liver
• c) Large intestine
• d) Stomach

4. What is the hallmark symptom of amoebic dysentery caused by E. histolytica?

• a) Diarrhea without blood
• b) Constipation
• c) Diarrhea with blood and mucus
• d) Vomiting

5. The cytoplasm of Entamoeba histolytica is differentiated into...

• a) Ectoplasm and endoplasm
• b) Cortex and medulla
• c) Protoplasm and cytoplasm
• d) Pellicle and cell membrane

6. The parasite multiplies by which method in the host's intestine?

• a) Binary fission
• b) Budding
• c) Multiple fission
• d) Schizogony

7. The term "histolytica" means...

• a) Tissue dissolving
• b) Blood eating
• c) Gut dwelling
• d) Pathogenic

8. The trophozoite of E. histolytica feeds on...

• a) Red blood cells and tissue fragments
• b) Bacteria and yeast
• c) Undigested food particles
• d) Only water

9. Which of the following is not a morphological form of Entamoeba histolytica?

• a) Minuta form
• b) Magna form
• c) Cyst form
• d) Sporozoite form

10. The cyst wall of Entamoeba histolytica is composed of...

• a) Chitin
• b) Cellulose
• c) Protein
• d) Glycogen

11. A non-pathogenic amoeba that resides in the human colon and is often confused with E. histolytica is...

• a) Entamoeba coli
• b) Acanthamoeba
• c) Naegleria fowleri
• d) Giardia lamblia

12. The most common extra-intestinal manifestation of amoebiasis is the formation of...

• a) Pulmonary abscess
• b) Brain abscess
• c) Liver abscess
• d) Skin ulcer

13. The trophozoite of E. histolytica is characterized by...

• a) Centrally located karyosome
• b) Eccentrically located karyosome
• c) Large glycogen vacuole
• d) The presence of red blood cells in food vacuoles

14. What is the mode of transmission for Entamoeba histolytica?

• a) Vector-borne
• b) Airborne
• c) Fecal-oral route
• d) Sexual contact

15. The final host for Entamoeba histolytica is...

• a) Pig
• b) Mosquito
• c) Human
• d) Dog

16. The nucleus of the trophozoite of E. histolytica contains a single, centrally located nucleolus called a...

• a) Karyosome
• b) Chromatin
• c) Nucleolus
• d) Endosome

17. Which of the following is responsible for tissue destruction by E. histolytica?

• a) Hyaluronidase
• b) Amylase
• c) Lipase
• d) Cellulase

18. The life cycle of Entamoeba histolytica is...

• a) Simple with one host
• b) Complex with two hosts
• c) Involving an intermediate vector
• d) Asexual and sexual in different hosts

19. Which form of the parasite is usually found in the feces of an asymptomatic carrier?

• a) Trophozoite
• b) Cyst
• c) Precyst
• d) Metacyst

20. The trophozoite of E. histolytica typically has how many nuclei?

• a) One
• b) Two
• c) Four
• d) Multiple

21. The precystic stage of E. histolytica is characterized by the loss of...

• a) Nucleus
• b) Cytoplasm
• c) Pseudopodia
• d) Food vacuoles

22. The term "amoebiasis" refers to a disease caused by...

• a) Any species of amoeba
• b) Entamoeba histolytica
• c) Entamoeba coli
• d) All intestinal protozoa

23. In the life cycle of E. histolytica, encystment takes place in the...

• a) Liver
• b) Small intestine
• c) Large intestine
• d) Human mouth

24. What is the primary method of diagnosis for amoebiasis?

• a) Blood test
• b) CT scan
• c) Stool examination
• d) Urine analysis

25. The presence of chromatoid bodies is a characteristic of which stage of E. histolytica?

• a) Trophozoite
• b) Precyst
• c) Cyst
• d) Metacyst

26. The metacystic stage of E. histolytica undergoes...

• a) Asexual reproduction
• b) Nuclear division and cytokinesis
• c) Encystment
• d) No change

27. The large intestine of the host is the primary location for the formation of "flask-shaped ulcers" by the parasite's action. This is done by the...

• a) Trophozoites
• b) Cysts
• c) Precysts
• d) Metacysts

28. Which of the following is not a common treatment for amoebiasis?

• a) Metronidazole
• b) Iodoquinol
• c) Penicillin
• d) Tinidazole

29. The pathogenic nature of E. histolytica is primarily due to its ability to...

• a) Produce toxins
• b) Invade the intestinal wall
• c) Multiply rapidly
• d) Inhibit host immune response

30. The cyst of E. histolytica can survive outside the host for...

• a) A few hours
• b) A few days
• c) Several weeks
• d) Several months

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