Profile
Settings
Refer your friends
Sign out
Paramecium is a single-celled organism that looks like the sole of a shoe. Its size varies from species to species, ranging from 50 to 300um. It is primarily found in freshwater habitats. It is a well-known genus of ciliate protozoa and is a single-celled eukaryote belonging to the kingdom Protista. Paramecium is a single-celled organism that looks like the sole of a shoe. Its size varies from species to species, ranging from 50 to 300um. It is primarily found in freshwater habitats. It is a well-known genus of ciliate protozoa and is a single-celled eukaryote belonging to the kingdom Protista.
1. Unicellular eukaryotes are grouped in
(a) Protista
(b) Monera
(c) Fungi
(d) Archaea
Answer: (a)
Explanation: Unicellular eukaryotes are grouped into ‘Only protists’, irrespective of their mode of nutrition. Because Fungi are multicellular eukaryotic organisms and Eubacteria are prokaryotes unicellular organisms.
2. In Paramecium, osmoregulation occurs through
(a) body surface
(b) pseudopodia
(c) nucleus
(d) contractile vacuole
Answer: (d)
Explanation: In Amoeba and Paramoecium, osmoregulation occurs through contractile vacuole. Osmoregulation is a phenomenon in which contractile vacuole plays an important role in maintaining the water balance of the cell. Paramoecium contains two contractile vacuoles which have fixed positions.
3. In Paramecium, genetic information is stored in
(a) all the nuclei present
(b) mitochondria
(c) micronucleus
(d) macronucleus
Answer: (c)
Explanation: The micronucleus is a storage site for the germline genetic material of the organism. It gives rise to the macronucleus and is responsible for the genetic reorganization that occurs during conjugation (cross-fertilization).
4. Phylum Protozoa is classified based on
(a) size
(b) shape
(c) number of nuclei
(d) locomotory organ
Answer: (d)
Explanation: On the basis of light and electron microscopic morphology, the protozoa are currently classified into six phyla. Most species causing human disease are members of the phylum Sacromastigophora and Apicomplexa.
5. Conjugation as a mode of reproduction is present in
(a) ciliata
(b) flagellata
(c) sarcodina
(d) sporozoa
Answer: (a)
Explanation: Conjugation is a sexual process in which two organisms of the same species, such as bacteria, protozoans and some algae and fungi, exchange nuclear material during a temporary union.
6. In Paramecium, food is ingested through
(a) cytoproct
(b) cytopyge
(c) cytostome
(d) cytopharynx
Answer: (c)
Explanation: Paramecium engulfs food through cilia (present on its body surface) through the oral groove. Food is ingested along with water to form the food vacuole.
7. Trichocyst of Paramecium is required for
(a) osmoregulation
(b) nutrition
(c) reproduction
(d) defence
Answer: (d)
Explanation: The trichocysts defend Paramecium against D. margaritifer. Thus, trichocysts in Paramecium serve as defensive organelles against several predators.
8. Paramecium are
(a) holophytic
(b) holozoic
(c) parasitic
(d) saprobiotic
Answer: (b)
Explanation: the correct answer is, “ Mode of nutrition in Paramecium is holozoic.” Note: Another mode of nutrition known as mixotrophic nutrition is also seen in some organisms. Organisms belonging to this category can exhibit both autotrophic and heterotrophic types of nutrition.
9. In Paramecium, metabolic activities and growth is regulated by
(a) macronucleus
(b) micronucleus
(c) both (a) and (b)
(d) contractile vacuole
Answer: (a)
Explanation:The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information.
10. In Paramecium, both autogamy and conjugation are called sexual reproduction because of
(a) rejuvenation
(b) gene combination
(c) the fusion of haploid gametes
(d) involvement of two individuals
Answer: (c)
Explanation: In paramecium , both autogamy and conjugation are sexual processes because of Rejuvenation.
11. Unicellular eukaryotes are grouped in
(a) Protista
(b) Monera
(c) Fungi
(d) Archaea
Answer: a
Explanation: Unicellular eukaryotes are grouped into ‘Only protists’, irrespective of their mode of nutrition. Because Fungi are multicellular eukaryotic organisms and Eubacteria are prokaryotic unicellular organisms.
12. In Paramecium, osmoregulation occurs through
(a) body surface
(b) pseudopodia
(c) nucleus
(d) contractile vacuole
Answer: d
Explanation: In Amoeba and Paramoecium, osmoregulation occurs through contractile vacuole. Osmoregulation is a phenomenon in which contractile vacuole plays an important role in maintaining the water balance of the cell. Paramoecium contains two contractile vacuoles which have fixed positions.
13. Conjugation as a mode of reproduction is present in
(a) ciliata
(b) flagellata
(c) sarcodina
(d) sporozoan
Answer: a
Explanation: Conjugation is a sexual process in which two organisms of the same species, such as bacteria, protozoans and some algae and fungi, exchange nuclear material during a temporary union.
14. In Paramecium, food is ingested through
(a) cytoproct
(b) cytopyge
(c) cytosome
(d) cytopharynx
Answer: c
Explanation:
Paramecium engulfs food through cilia (present on its body surface) through the oral groove. Food is ingested along with water to form the food vacuole.
15. Trichocyst of Paramecium is required for
(a) osmoregulation
(b) nutrition
(c) reproduction
(d) defence
Answer: d
Explanation:
The trichocysts defend Paramecium against D. margaritifer. Thus, trichocysts in Paramecium serve as defensive organelles against several predators.
16. In Paramecium, both autogamy and conjugation are called sexual reproduction because of
(a) rejuvenation
(b) gene combination
(c) the fusion of haploid gametes
(d) involvement of two individuals
Answer: c
Explanation: In paramecium , both autogamy and conjugation are sexual processes because of Rejuvenation.
17. Paramecium is a eukaryotic organism.
a. True
b. False
Correct Option: b
Explanation: Eukaryotes are Paramecium. Eukaryotes, unlike prokaryotic creatures like bacteria and archaea, have well-organized cells.
18. Paramecium is heterotrophic or autotrophic.
a. Heterotrophic
b. Autotrophic
c. None of these
Correct Option: a
Explanation: Ciliates, like Paramecium, are heterotrophic, meaning they receive food into their cells through an oral groove and then store it in a food vacuole once inside. Paramecium are heterotrophs, which means they must eat to survive. The mouth pore (orange in picture) is where food enters the paramecium and travels to the gullet (color dark blue). Food vacuoles occur at the end of the gullet. The food vacuoles then stay in the cytoplasm until it is digested.
