Tag: protozoa

Questions Related to protozoa

Which protistian structure is not correctly matched with its function?

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Pseudopodia- movement and feeding

  2. Cyst- reproductive structure

  3. Eyespot- light detection

  4. Trichocyst- defense and capture of prey

Show answer
Correct Option: B
Explanation:

An organism in it's dormant stage is called a cyst. In these conditions, an organism is inactive and does not perform any daily activities. Thus, they help the organisms survive in unfavourable conditions.

So, option B is the correct answer.

Which of the following kingdoms is intermediate between kingdom monera and muiticellular organisms?

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Fungi

  2. Animalia

  3. Plantae

  4. Protista

Show answer
Correct Option: D
Explanation:
The monera is the kingdom which comprises of the prokaryotes. The Protista is a kingdom of simple single-celled eukaryotic organisms. They have well-developed cellular components like the nucleus, mitochondria, chloroplast, etc on the basis of which they have been classified as plant and animals like protists. The kingdom Protista is considered as the link between the prokaryotes and the multicellular eukaryotes. 
Thus, the correct answer is option D.  

Which of the following are the characteristics of kingdom Protista?

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Multicellular organisms whose chromosomes are not enclosed in a nuclear membrane.

  2. Unicellular organisms whose chromosomes are not enclosed in a nuclear membrane.

  3. Unicellular organisms whose chromosomes are enclosed in a nuclear membrane.

  4. Multicellular organisms whose chromosomes are enclosed in a nuclear membrane.

Show answer
Correct Option: C
Explanation:
The Protista is a kingdom of simple single-celled eukaryotic organisms. They have well-developed cellular components like the nucleus, mitochondria, chloroplast, etc on the basis of which they have been classified as plant and animals like protists. The chromosomes are enclosed in the nuclear membrane. These are mostly aquatic organisms which have flagellated structures for movement. 
Thus, the correct answer is option C.  

A symbiotic protist is

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Plasmodium

  2. Lophomonas

  3. Fuligo

  4. Trypanosoma

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Correct Option: B
Explanation:

Lophomonas are the protists that can live in a symbiotic relationship or as a parasite in the body of their host. The hosts are arthropods, which could be termites, cockroaches in which lophomonas lives in their digestive system or intestinal tracts.

The correct answer is B.

The first eukaryotes to evolve were

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Bryophytes

  2. Green algae

  3. Blue-green algae

  4. Protistans

Show answer
Correct Option: D
Explanation:

  • The simple protists were similar to bacteria but they gradually evolved as eukaryotes wherein each cell is having a nucleus. 
  • They are not an animal, plant or fungus but they may be closely related to plants. 
  • They may survive alone or may group as per the convenience.
  • The correct answer is D. 

Which of the following is a symbiont?

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Vorticella

  2. Paramecium

  3. Colpidium

  4. Trichonympha

Show answer
Correct Option: D
Explanation:
  • Zootermopsis, the pine woods termite, contains vast numbers of the wood engulfing symbiont Trichonympha, along with a number of other species, such as the primitive flagellate, Streblomastix and Trichomonas, a genus commonly found in warm, moist interiors of virtual all species of animals. 
  • Trichonympha along with these huge cells are bacteria residing in the termite gut assist in breaking down the cellulose. Hence the correct option is D.

Entamoeba histolytica is

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Monogenetic

  2. Digenetic

  3. Free-living

  4. None of the above

Show answer
Correct Option: A
Explanation:
This kind of protozoan parasite resides in the mucous and sub-mucous layer of the large intestine specially at the iliocaecal junction and cause dysentery, diarrhoea, hepatitis and liver abscess in man. Entamoeba  histolytica is a monogenetic parasite as its entire life history is completed in a single host.
So, the correct answer is 'Monogenetic'

Water collecting canals around the contractile vacuole are called _________.

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Incurrent canals

  2. Excurrent canals

  3. Radiating canals

  4. None of the above

Show answer
Correct Option: C
Explanation:

Water collecting canals around the contractile vacuole are called Radiating canals The contractile vacuole is the part that contracts and forces extra water out of the cell. The radiating canals are the paths to the contractile vacuole. In Paramecium, these are two contractile vacuoles while one in Amoeba.

Macronucleus of Paramecium takes part in

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Transmission of hereditary characters

  2. Controlling normal cellular metabolism

  3. Production of variations and adaptability

  4. All the above

Show answer
Correct Option: B
Explanation:
Paramecium has two types of nucleus- micronucleus and macronucleus. Macronucleus perform common cellular functions and micronucleus takes part in sexual reproduction. 
Thus, the correct answer is option (B).

Entamoeba histolytica secretes proteolytic enzyme called _________.

biology the world of microbes protista protozoa five kingdoms of living organisms

  1. Polypeptidase

  2. Histolysin

  3. Pepsin

  4. Trypsin

Show answer
Correct Option: B
Explanation:

Entamoeba histolytica secretes proteolytic enzyme called Histolysin.