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Classification of Unicellular Eukaryotic Organisms

Description: This test will help the learning aspirants to revise the above mentioned topic thoroughly as it contains the questions from various subtopics like Protozoa ,slime moulds and dinoflagellates.
Number of Questions: 24
Created by:
Tags: Protozoa and dinoflagellates Protozoans Chlorophycae Euglenoids Dinoflagellates
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Which of the following statements is not true for euglena?

  1. Euglena divides horizontally.

  2. Euglena possesses a red eyespot.

  3. Euglena lacks a cell wall.

  4. Euglena can form a protective wall around itself during unfavourable conditions.

  5. Euglena's chloroplasts are surrounded by three membranes.

Show answer
Correct Option: A
Explanation:

Euglena reproduces asexually through binary fission. 

The protozoa commonly known as giant amoeba is

  1. acanthamoeba

  2. amoeba

  3. balamuthia

  4. chaos

  5. clydonella

Show answer
Correct Option: D
Explanation:

Chaos is a genus of amoebae in the family Amoebidae. The largest and best known species, the so-called giant amoeba Chaos carolinense, can reach upto a length of 5 mm.

Which of the following amoebozoa occurs predominantly as internal parasites or commensals of various organisms?

  1. Gephyramoeba

  2. Conosa

  3. Paramoeba

  4. Endamoeba

  5. Entamoeba

Show answer
Correct Option: E
Explanation:

Entamoeba is a genus of amoebozoa found as internal parasites or commensals of animals. 

Which of the following dinoflagellates causes harmful algal blooms?

  1. Alexandrium

  2. Pfiesteria

  3. Gonyaulax

  4. Symbiodinium

  5. Lingulodinium

Show answer
Correct Option: B
Explanation:

Pfiesteria is a genus of heterotrophic dinoflagellates that causes harmful algal blooms that kill fishes. 

Which of the following is used as a booster for paddy crops grown both under upland and lowland conditions?

  1. Azotobacter

  2. Nostoc

  3. Anabaena

  4. Azospirillum

  5. Pseudomonas putida

Show answer
Correct Option: B
Explanation:

Nostoc can fix atmospheric nitrogen and is used as inoculations for paddy crops grown both under upland and lowland conditions.

The microorganism used to ripen the surfaces of sausages is

  1. P. roqueforti

  2. P. nalgiovense

  3. P. camemberti

  4. S. cerevisiae

  5. S. pastorianus

Show answer
Correct Option: B
Explanation:

P. nalgiovense is used to ripen the surfaces of sausages. 

Which of the following is the causative agent for acute diarrhoea?

  1. Cystoisospora belli

  2. Isospora belli

  3. Isospora hammondi

  4. Isospora

  5. Cyclospora cayetanensis

Show answer
Correct Option: E
Explanation:

Cyclospora cayetanensis is an apicomplexan, cyst-forming coccidian protozoa that causes acute self-limiting diarrhoea.

Spirulina is a blue-green freshwater algae that is rich in proteins and can help boost the immune system of the body. It is utilised in

  1. single cell protein

  2. toddy

  3. dosa, uppma and idli

  4. sour cream

  5. butter milk

Show answer
Correct Option: A
Explanation:

It is used as a supplementary food for humans and animals.

Which of the following protists is used to add sparkle to fingernail polishes as well as paints?

  1. Red algae

  2. Brown algae

  3. Slime molds

  4. Diatoms

  5. Gonyaulax

Show answer
Correct Option: D
Explanation:

Diatoms are found in seawater and freshwater habitats. They are used as water filters, abrasives and to add sparkling to products, such as paints and fingernail polishes.

Schüffner's dots are fine, round, uniformly red or red-yellow staining dots occurring in red blood cells of humans. Schuffner's dots observed in erythrocytes are due to

  1. laryngitis

  2. kala-azar

  3. malaria

  4. filariasis

  5. giardiasis

Show answer
Correct Option: C
Explanation:

Schüffner's dots refer to a hematological finding that is associated with malaria.

Which of the following protists can cause certain diseases in plants?

  1. Protostelium

  2. Labyrinthulomycota

  3. Plasmodiophorids

  4. Acrasids

  5. Fonticula

Show answer
Correct Option: C
Explanation:

Plasmodiophorids are the parasitic protists which belong to the super group Rhizaria. 

Chagas disease is an inflammatory, infectious disease caused by a parasite found in the faeces of the triatomine (reduviid) bug. Which of the following trypanosoma species has been proposed for the prevention of Chagas disease?

  1. Trypanosoma rangeli

  2. Trypanosoma suis

  3. Trypanosoma irwini

  4. Trypanosoma brucei

  5. Trypanosoma cruzi

Show answer
Correct Option: A
Explanation:

Trypanosoma rangeli is considered non pathogenic in humans. It has been proposed for the prevention of Chagas disease.

Old world monkeys are a diverse group of primates in terms of body size, habitat and social organisation. Which of the following is a causative agent of malaria in old world monkeys?

  1. Plasmodium inui

  2. Plasmodium garnhami

  3. Plasmodium falciparum

  4. Plasmodium ovale

  5. Plasmodium coatneyi

Show answer
Correct Option: A
Explanation:

Plasmodium inui is one of the species of simian plasmodium that causes malaria in old world monkeys.

Which of the following statements does NOT characterise the life cycle of P. falciparum in the female Anopheles mosquito?

  1. The sporozoites complete their differentiation in the salivary glands of mosquito.

  2. Immature sporozoites break through the oocyst wall into the haemolymph.

  3. The ookinete is an invasive form of P. falciparum within the mosquito.

  4. During the ookinete stage, genetic recombination can occur.

  5. The ookinete is the only haploid stage of P. falciparum.

Show answer
Correct Option: E
Explanation:

Fertilisation of the female gamete by the male gamete occurs rapidly after gametogenesis.

Which of the following micro-organisms is often found associated with HIV-positive patients presenting diarrhoea?

  1. Babesia

  2. Balamuthia mandrillaris

  3. Balantidium coli

  4. Cryptosporidium

  5. Acanthamoeba

Show answer
Correct Option: D
Explanation:

Cryptosporidium is a genus of apicomplexan protozoans that can cause gastrointestinal illness with diarrhoea in humans. 

Neglected Tropical Diseases (NTDs) represent a group of diverse diseases that cause significant morbidity and mortality worldwide. Which of the following is a Neglected Tropical Disease?

  1. Amebiasis

  2. Schistosomiasis

  3. Alveolar echinococcosis

  4. Granulomatous amebic encephalitis

  5. African trypanosomiasis

Show answer
Correct Option: B
Explanation:

Schistosomiasis, also known as bilharzia, is a disease caused by parasitic worms.

Which of the following slime moulds has been found in eyewash stations?

  1. Vexillifera

  2. Himatismenida

  3. Cochliopodium

  4. Dermamoeba

  5. Sappinia

Show answer
Correct Option: C
Explanation:

Cochliopodium is a Himatismenida genus. It has been found in eyewash stations.

The dictyostelids are commonly known as social amoebae. Which of the following statements does not characterise dictyostelids?

  1. They form pseudoplasmodium if the food supply is inadequate.

  2. The slug is capable of responding to light and temperature gradients.

  3. Dictyostelium is an interesting example of the evolution of cooperation and cheating.

  4. Only the heterothallic strains of dictostelium can undergo mating.

  5. Mating is initiated by gametogenesis.

Show answer
Correct Option: D
Explanation:

Sexual development can occur when amoeboid cells are starved for their bacterial food supply and dark humid conditions are present. 

Which of the following amoebozoa is commonly found in the intestines of numerous animals?

  1. Arcella

  2. Centropyxis

  3. Arcellinida

  4. Copromyxa

  5. Endolimax

Show answer
Correct Option: E
Explanation:

Endolimax is a genus of amoebozoa found in the intestines of various animals.

Which of the following statements regarding Entamoeba is FALSE?

  1. Multi nucleated trophozoites convert into cysts in a process called encystation.

  2. Entamoeba belongs to Archamoebae.

  3. The trophozoites of Entamoeba feed primarily on bacteria.

  4. Entamoeba coli is harmless.

  5. All Entamoeba species are found in the intestines of the animals that they infect.

Show answer
Correct Option: A
Explanation:

Uni-nucleated trophozoites convert into cysts in a process called encystation. 

The parasitic protozoan capable of developing immediately beneath the brush-border of the intestinal epithelium after infection is

  1. acroeimeriaa

  2. eimeria

  3. hemiptera

  4. anthemosoma

  5. ascetosporea

Show answer
Correct Option: A
Explanation:

Acroeimeria is a genus of protozoan parasite that contains those parasites which initially develop immediately beneath the brush-border of the intestinal epithelium, but the meronts and gamonts of which are early on extruded to form a layer on the surface of the gut mucosa.

Levels of mercury in blood and urine are normally very low. The alga capable of reducing mercury levels in humans is

  1. Palmaria palmata

  2. Ulva lactuca

  3. Chlorella

  4. Chondrus crispus

  5. Aphanizomenon flos-aquae

Show answer
Correct Option: C
Explanation:

Chlorella is very popular in Japan. It is also used as a nutritional supplement with possible effects on the metabolic rate. It can reduce mercury levels in humans by chelation of mercury to the cell wall of the organism.

Which of the following statements is incorrect regarding algal blooms?

  1. The freshwater and ocean blooms have been found to be anthropogenic.

  2. Looms may be observed in freshwater aquariums.

  3. Freshwater algal blooms are the result of deficiency of nutrients.

  4. Bright green blooms are a result of cyanobacteria.

  5. Red tide is a term often used to describe HABs in marine coastal areas.

Show answer
Correct Option: C
Explanation:

Freshwater algal blooms are the result of an excess of nutrients, particularly some phosphates. 

Maitotoxin is an extremely potent toxin. Which of the following plays a role in its production?

  1. Gambierdiscus australes

  2. Gambierdiscus belizeanus

  3. Gambierdiscus pacificus

  4. Gambierdiscus toxicus

  5. Gloeokinium viscum

Show answer
Correct Option: D
Explanation:

Gambierdiscus toxicus is a species of dinoflagellates. It is the agent for ciguatera. It produces maitotoxin.

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