Protozon Questions and Answers

Q: Who gave acellular concept for protozoans?

Correct answer: DobellDobell argued that a protozoan should not be called unicellular, since it is not a cell comparable to one in a metazoan body but a complete organism whose functions are carried out by organelles. The acellular view treats the animal as a whole rather than as a single cell, and it is why the organelles are named for the functions they perform.

Q: Pellicle is present in:

Correct answer: Amoeba verrucosaA. verrucosa is unusual among the amoebae in having a thick wrinkled pellicle, which is where its name comes from. The covering makes it sluggish, with short blunt pseudopodia, and it is the exception to the rule that an amoeba is naked.

Q: First studied protozoa by Leeuwenhoek was:

Correct answer: VorticellaVorticella is a stalked ciliate common in pond water and conspicuous under a simple lens because of the way its stalk contracts into a spiral. That visible movement is why it was among the first of the animalcules Leeuwenhoek recorded.

Q: Food vacuole in Amoeba is analogous to:

Correct answer: Digestive tract of higher animalsThe food vacuole is where digestion happens: enzymes are secreted into it, the food is broken down, the products pass into the cytoplasm and the residue is expelled. That is the whole function of a gut, performed within a single cell - which is the point of calling a protozoan acellular rather than unicellular.

Q: Which of the following protozoan causes African sleeping sickness

Correct answer: Trypanosoma gambienseT. gambiense causes the chronic West African form of sleeping sickness and T. rhodesiense the acute East African form, both carried by the tsetse fly. T. lewisi is a parasite of rats and harmless to man, and the other two options belong to quite different diseases.

Q: Which of these is a marine amoeba:

Correct answer: Thecamoeba orbisThecamoeba orbis is a marine form, while Amoeba proteus, A. verrucosa, A. radiosa and A. dubia are all freshwater. The distinction has a physiological consequence: living in seawater, which is close to isotonic, the marine forms have little or no need of a contractile vacuole.

Q: Protozoa are classified on the basis of

Correct answer: locomotory organelleThe traditional classification turns on how the animal moves: pseudopodia in Sarcodina, flagella in Mastigophora, cilia in Ciliata, and nothing at all in Sporozoa. Shape, size and nuclear number vary too widely within each group to serve, whereas the organelle of locomotion is constant and easily observed.

Q: Organ of defense in protozoans is

Correct answer: trichocystsTrichocysts lie beneath the pellicle of Paramecium and discharge as fine threads when the animal is disturbed, serving in defence and in anchorage. Nematocysts belong to the cnidarians, and statocysts and otocysts are organs of balance in higher animals.

Q: Amoeba is called naked because:

Correct answer: It has a delicate plasma membraneNaked here means unprotected: the amoeba has only its thin plasma membrane, with no pellicle, test or shell over it. That is precisely what allows the cell to change shape freely and put out pseudopodia, and it is the feature distinguishing the naked amoebae from the shelled forms such as Arcella and Difflugia.

Q: Hay-infusion method is used for the culture of:

Correct answer: Amoeba and parameciumA hay infusion is prepared by steeping dried hay or grass in water and leaving it to stand. Bacteria multiply on the decaying material and provide food for the protozoa, which appear in succession over days - flagellates first, then ciliates such as Paramecium, then amoebae. It is the standard laboratory method for obtaining both.

11.

Who gave acellular concept for protozoans?

A.Dobell
B.Von Seibold
C.Cuvier
D.None of these

Answer: A

Correct answer: Dobell

Dobell argued that a protozoan should not be called unicellular, since it is not a cell comparable to one in a metazoan body but a complete organism whose functions are carried out by organelles. The acellular view treats the animal as a whole rather than as a single cell, and it is why the organelles are named for the functions they perform.

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12.

Pellicle is present in:

A.Amoeba verrucosa
B.Amoeba proteus
C.Amoeba dubia
D.None of these

Answer: A

Correct answer: Amoeba verrucosa

A. verrucosa is unusual among the amoebae in having a thick wrinkled pellicle, which is where its name comes from. The covering makes it sluggish, with short blunt pseudopodia, and it is the exception to the rule that an amoeba is naked.

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13.

First studied protozoa by Leeuwenhoek was:

A.Amoeba
B.Euglena
C.Vorticella
D.None of these

Answer: C

Correct answer: Vorticella

Vorticella is a stalked ciliate common in pond water and conspicuous under a simple lens because of the way its stalk contracts into a spiral. That visible movement is why it was among the first of the animalcules Leeuwenhoek recorded.

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14.

Food vacuole in Amoeba is analogous to:

A.Digestive tract of higher animals
B.Circulatory system of high animals
C.Only mouth of higher animals
D.None of these

Answer: A

Correct answer: Digestive tract of higher animals

The food vacuole is where digestion happens: enzymes are secreted into it, the food is broken down, the products pass into the cytoplasm and the residue is expelled. That is the whole function of a gut, performed within a single cell - which is the point of calling a protozoan acellular rather than unicellular.

Discuss in Forum

15.

Which of the following protozoan causes African sleeping sickness

A.Plasmodium vivax
B.Entamoeba gingivalis
C.Trypanosoma lewsii
D.Trypanosoma gambiense

Answer: D

Correct answer: Trypanosoma gambiense

T. gambiense causes the chronic West African form of sleeping sickness and T. rhodesiense the acute East African form, both carried by the tsetse fly. T. lewisi is a parasite of rats and harmless to man, and the other two options belong to quite different diseases.

Discuss in Forum

16.

Which of these is a marine amoeba:

A.Amoeba radiosa
B.Thecameoba orbis
C.Amoeba verrucosa
D.Amoeba dubina

Answer: B

Correct answer: Thecamoeba orbis

Thecamoeba orbis is a marine form, while Amoeba proteus, A. verrucosa, A. radiosa and A. dubia are all freshwater. The distinction has a physiological consequence: living in seawater, which is close to isotonic, the marine forms have little or no need of a contractile vacuole.

Discuss in Forum

17.

Protozoa are classified on the basis of

A.locomotory organelle
B.shape
C.number of nuclei
D.size

Answer: A

Correct answer: locomotory organelle

The traditional classification turns on how the animal moves: pseudopodia in Sarcodina, flagella in Mastigophora, cilia in Ciliata, and nothing at all in Sporozoa. Shape, size and nuclear number vary too widely within each group to serve, whereas the organelle of locomotion is constant and easily observed.

Discuss in Forum

18.

Organ of defense in protozoans is

A.statocysts
B.trichocysts
C.otocysts
D.nematocysts

Answer: B

Correct answer: trichocysts

Trichocysts lie beneath the pellicle of Paramecium and discharge as fine threads when the animal is disturbed, serving in defence and in anchorage. Nematocysts belong to the cnidarians, and statocysts and otocysts are organs of balance in higher animals.

Discuss in Forum

19.

Amoeba is called naked because:

A.It is single celled
B.It has a delicate plasma membrane
C.It is uninucleated
D.It has all of these

Answer: B

Correct answer: It has a delicate plasma membrane

Naked here means unprotected: the amoeba has only its thin plasma membrane, with no pellicle, test or shell over it. That is precisely what allows the cell to change shape freely and put out pseudopodia, and it is the feature distinguishing the naked amoebae from the shelled forms such as Arcella and Difflugia.

Discuss in Forum

20.

Hay-infusion method is used for the culture of:

A.Amoeba and paramecium
B.Euglena
C.Balantidium
D.None of these

Answer: A

Correct answer: Amoeba and paramecium

A hay infusion is prepared by steeping dried hay or grass in water and leaving it to stand. Bacteria multiply on the decaying material and provide food for the protozoa, which appear in succession over days - flagellates first, then ciliates such as Paramecium, then amoebae. It is the standard laboratory method for obtaining both.

Discuss in Forum

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