Protozon Questions and Answers

Q: Which one of the following protozoan parasites belongs to the phylum Apicomplexa?

The apicomplexan parasite is Toxoplasma gondii.Apicomplexa are obligate intracellular parasites named after the apical complex, a group of organelles at one end of the cell used to invade host cells. The phylum also includes Plasmodium (malaria) and Cryptosporidium.The others belong to different groups. Leishmania donovani, the cause of kala-azar, is a flagellated kinetoplastid. Entamoeba histolytica is an amoeba that moves by pseudopodia. Trichomonas vaginalis is a flagellate (a parabasalid). None of them has an apical complex.

Q: Which of the following protozoa causes amoebiasis?

Amoebiasis is caused by E. histolytica, Entamoeba histolytica.The infection spreads by swallowing cysts in contaminated food or water. The trophozoites invade the wall of the large intestine, causing amoebic dysentery with flask-shaped ulcers, and can spread to the liver to form an amoebic liver abscess.Giardia intestinalis causes giardiasis, a small-intestinal infection with fatty diarrhoea. Toxoplasma gondii causes toxoplasmosis, and Trichomonas vaginalis causes trichomoniasis, a genital infection. None of these is an amoeba.

Q: In Amoeba and Paramecium, the cell organelle for osmoregulation is

Correct answer: contractile vacuoleFresh water is hypotonic to the cell, so water enters continuously by osmosis and would burst it. The contractile vacuole collects that surplus and expels it, doing osmotic rather than excretory work - which is why marine and parasitic protozoa, living in isotonic surroundings, mostly lack one.

Q: Pseudopodia of Amoeba are:

Correct answer: LobopodiaAmoeba extends blunt, rounded, finger-like lobopodia containing both ectoplasm and endoplasm, which is the characteristic form for the genus. Filopodia are fine and pointed, axopodia are slender and stiffened by an internal axial rod, and reticulopodia branch and rejoin as a net - each belonging to a different group of sarcodines.

Q: Name protozoa was given by:

Correct answer: GoldfussGoldfuss introduced the name Protozoa in 1818, from the Greek for first animals. He applied it more widely than we do now - his group included some organisms since moved elsewhere - but the name and the sense of a first grade of animal life come from him.

Q: Trypanosoma belongs to which of the following group?

Correct answer: mastigophoraTrypanosoma moves by a flagellum running along an undulating membrane, which places it among the Mastigophora, the flagellates. The genus includes the agents of sleeping sickness and of Chagas disease, both transmitted by biting insects.

Q: Biurete and triurete crystals of Amoeba are formed of:

Correct answer: Carbonyl diureaThe biuret and triuret crystals of the amoeba’s cytoplasm are carbonyl diurea, a nitrogenous waste product. They accumulate as excretory granules and are voided at the cell surface, the amoeba having no organ of excretion beyond the general membrane and the contractile vacuole.

Q: Unicellular eukaryotes are grouped in

Correct answer: ProtistaProtista is the kingdom for eukaryotes that are single-celled or simple colonial forms, and it holds the protozoa along with the algae and the slime moulds. Monera and Archaea are prokaryotic, having no nucleus at all, and fungi are multicellular with chitinous walls.

Q: Protozoa were first discovered by:

Correct answer: LeeuwenhoekLeeuwenhoek saw protozoa in the 1670s through the simple single-lens microscopes he ground himself, calling the moving forms animalcules. His observations are the first record of the group, and they preceded any classification of it by a century and a half.

Q: Pellicle is found in:

Correct answer: Euglena and parameciumBoth have a pellicle - a firm proteinaceous layer beneath the plasma membrane that gives the cell a definite shape. In Euglena it is flexible enough to permit the wriggling euglenoid movement; in Paramecium it is rigid enough to fix the slipper shape. Amoeba has none, which is why it has no shape of its own.

Which one of the following protozoan parasites belongs to the phylum Apicomplexa?

A.Toxoplasma gondii
B.Leishmania donovani
C.Entamoeba histolytica
D.Trichomonas vaginalis

Exam Year(s)

IIT JAM - 2018,

Answer: A

The apicomplexan parasite is Toxoplasma gondii.

Apicomplexa are obligate intracellular parasites named after the apical complex, a group of organelles at one end of the cell used to invade host cells. The phylum also includes Plasmodium (malaria) and Cryptosporidium.

The others belong to different groups. Leishmania donovani, the cause of kala-azar, is a flagellated kinetoplastid. Entamoeba histolytica is an amoeba that moves by pseudopodia. Trichomonas vaginalis is a flagellate (a parabasalid). None of them has an apical complex.

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Which of the following protozoa causes amoebiasis?

A.Giardia intestinalis
B.E. Histolytica
C.Toxoplasma
D.Trichomonas

Exam Year(s)

RSMSSB - 2025, RSMSSB Lab Technician - 2025,

Answer: B

Amoebiasis is caused by E. histolytica, Entamoeba histolytica.

The infection spreads by swallowing cysts in contaminated food or water. The trophozoites invade the wall of the large intestine, causing amoebic dysentery with flask-shaped ulcers, and can spread to the liver to form an amoebic liver abscess.

Giardia intestinalis causes giardiasis, a small-intestinal infection with fatty diarrhoea. Toxoplasma gondii causes toxoplasmosis, and Trichomonas vaginalis causes trichomoniasis, a genital infection. None of these is an amoeba.

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In Amoeba and Paramecium, the cell organelle for osmoregulation is

A.nucleus
B.body surface
C.contractile vacuole
D.pseudopodia

Answer: C

Correct answer: contractile vacuole

Fresh water is hypotonic to the cell, so water enters continuously by osmosis and would burst it. The contractile vacuole collects that surplus and expels it, doing osmotic rather than excretory work - which is why marine and parasitic protozoa, living in isotonic surroundings, mostly lack one.

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Pseudopodia of Amoeba are:

A.Lobopodia
B.Filopodia
C.Axopodia
D.All of these

Answer: A

Correct answer: Lobopodia

Amoeba extends blunt, rounded, finger-like lobopodia containing both ectoplasm and endoplasm, which is the characteristic form for the genus. Filopodia are fine and pointed, axopodia are slender and stiffened by an internal axial rod, and reticulopodia branch and rejoin as a net - each belonging to a different group of sarcodines.

Discuss in Forum

Name protozoa was given by:

A.Goldfuss
B.Hall
C.Jablot
D.None of these

Answer: A

Correct answer: Goldfuss

Goldfuss introduced the name Protozoa in 1818, from the Greek for first animals. He applied it more widely than we do now - his group included some organisms since moved elsewhere - but the name and the sense of a first grade of animal life come from him.

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Trypanosoma belongs to which of the following group?

A.mastigophora
B.sarcodina
C.sporozoa
D.ciliata

Answer: A

Correct answer: mastigophora

Trypanosoma moves by a flagellum running along an undulating membrane, which places it among the Mastigophora, the flagellates. The genus includes the agents of sleeping sickness and of Chagas disease, both transmitted by biting insects.

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Biurete and triurete crystals of Amoeba are formed of:

A.Urea
B.Uric acid
C.Guanine
D.Carbonyl diurea

Answer: D

Correct answer: Carbonyl diurea

The biuret and triuret crystals of the amoeba’s cytoplasm are carbonyl diurea, a nitrogenous waste product. They accumulate as excretory granules and are voided at the cell surface, the amoeba having no organ of excretion beyond the general membrane and the contractile vacuole.

Discuss in Forum

Unicellular eukaryotes are grouped in

A.Monera
B.Protista
C.Archaea
D.Fungi

Answer: B

Correct answer: Protista

Protista is the kingdom for eukaryotes that are single-celled or simple colonial forms, and it holds the protozoa along with the algae and the slime moulds. Monera and Archaea are prokaryotic, having no nucleus at all, and fungi are multicellular with chitinous walls.

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Protozoa were first discovered by:

A.Pasteur
B.Leeuwenhoek
C.Darwin
D.Kudo

Answer: B

Correct answer: Leeuwenhoek

Leeuwenhoek saw protozoa in the 1670s through the simple single-lens microscopes he ground himself, calling the moving forms animalcules. His observations are the first record of the group, and they preceded any classification of it by a century and a half.

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10.

Pellicle is found in:

A.Amoeba
B.Euglena
C.Euglena and paramecium
D.All of these

Answer: C

Correct answer: Euglena and paramecium

Both have a pellicle - a firm proteinaceous layer beneath the plasma membrane that gives the cell a definite shape. In Euglena it is flexible enough to permit the wriggling euglenoid movement; in Paramecium it is rigid enough to fix the slipper shape. Amoeba has none, which is why it has no shape of its own.

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