Questions on Protozoa
Multiple-Choice Questions – Protozoa
1. Protozoa are best described as:
A) Multicellular fungi
B) Unicellular prokaryotes
C) Unicellular eukaryotic organisms
D) Autotrophic bacteria
E) Colonial algae
2. The main characteristic that distinguishes protozoa from other protists is:
A) Cell wall composition
B) Mode of photosynthesis
C) Ability to form spores
D) Heterotrophic nutrition and animal-like behavior
E) Lack of a nucleus
3. Protozoa are classified into different groups based on their:
A) Pigment color
B) Type of chloroplast
C) Mode of locomotion
D) Number of flagella
E) Shape of nucleus
4. Which of the following protozoa use pseudopodia for movement?
A) Euglena
B) Paramecium
C) Amoeba
D) Plasmodium
E) Trypanosoma
5. A ciliate protozoan moves using:
A) Flagella
B) Pseudopodia
C) Cilia
D) Jet propulsion
E) Gliding mechanism
6. Which structure helps the Amoeba engulf food particles?
A) Cilia
B) Oral groove
C) Contractile vacuole
D) Flagellum
E) Pseudopodia
7. A flagellated protozoan that causes African sleeping sickness is:
A) Giardia
B) Plasmodium
C) Trypanosoma
D) Paramecium
E) Toxoplasma
8. Plasmodium, which causes malaria, is transmitted by:
A) Contaminated water
B) Mosquito bites
C) Sexual contact
D) Soil ingestion
E) Airborne droplets
9. Protozoa reproduce mainly by:
A) Binary fission
B) Budding
C) Spore formation
D) Fragmentation
E) Regeneration
10. Which disease is not caused by protozoa?
A) Malaria
B) Amoebiasis
C) Sleeping sickness
D) Tuberculosis
E) Giardiasis
11. The contractile vacuole in protozoa is used for:
A) Storing nutrients
B) Digestion
C) Osmoregulation
D) Reproduction
E) Movement
12. Protozoa are generally found in:
A) Dry deserts
B) Arctic ice only
C) Moist and aquatic environments
D) Only inside host cells
E) Volcanic rocks
13. Which group of protozoa is non-motile and parasitic?
A) Amoeboids
B) Flagellates
C) Ciliates
D) Sporozoans
E) Euglenoids
14. Which protozoan is commonly studied for its complex cilia-based movement?
A) Amoeba
B) Euglena
C) Giardia
D) Paramecium
E) Plasmodium
15. A unique feature of Euglena is that it:
A) Has no nucleus
B) Is photosynthetic and heterotrophic
C) Reproduces sexually
D) Is a ciliate
E) Forms pseudopodia
16. Trophozoite refers to:
A) Dormant spore form of protozoa
B) Active, feeding stage of protozoa
C) Protective cyst form
D) Reproductive structure
E) None of the above
17. Which structure in protozoa aids in digesting food?
A) Chloroplast
B) Nucleus
C) Food vacuole
D) Cell wall
E) Ribosome
18. Protozoa belong to which domain?
A) Archaea
B) Bacteria
C) Eukarya
D) Virus
E) Prokarya
19. The ability of some protozoa to form a cyst is advantageous because:
A) It increases reproduction
B) It allows for photosynthesis
C) It helps survive unfavorable conditions
D) It aids in movement
E) It enhances oxygen absorption
20. The study of protozoa is called:
A) Bacteriology
B) Mycology
C) Protozoology
D) Virology
E) Cytology
Answer Key with Explanations
1. C – Protozoa are unicellular and eukaryotic.
2. D – They are animal-like and heterotrophic, unlike other protists.
3. C – Classification is primarily based on locomotion: flagella, cilia, pseudopodia, or none.
4. C – Amoeba moves using pseudopodia (false feet).
5. C – Ciliates like Paramecium use cilia for movement.
6. E – Amoeba uses pseudopodia to engulf food by phagocytosis.
7. C – Trypanosoma is the protozoan causing African sleeping sickness.
8. B – Malaria is transmitted by Anopheles mosquito bites.
9. A – Most protozoa reproduce asexually by binary fission.
10. D – Tuberculosis is caused by bacteria, not protozoa.
11. C – Contractile vacuoles help maintain osmotic balance.
12. C – Protozoa thrive in moist environments like freshwater, marine, and inside organisms.
13. D – Sporozoans like Plasmodium are non-motile and parasitic.
14. D – Paramecium is a classic example of a ciliate.
15. B – Euglena is both autotrophic (photosynthetic) and heterotrophic.
16. B – Trophozoite is the active, feeding stage.
17. C – Food vacuoles digest ingested nutrients.
18. C – Being eukaryotes, protozoa are part of the domain Eukarya.
19. C – Cysts help protozoa survive harsh environmental conditions.
20. C – The study of protozoa is known as protozoology.
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