Explain briefly the feeding mechanism in protozoa. Citing examples of organisms, state the functions of the following structures: (a) Contractile vacuole (b) Corona (c) Flame cell... Explain briefly the feeding mechanism in protozoa. Citing examples of organisms, state the functions of the following structures: (a) Contractile vacuole (b) Corona (c) Flame cell (d) Cysts (e) Nematocyst. Use a diagram to illustrate the structure of Acanthocephala.
Understand the Problem
The question is asking for explanations of specific biological structures and mechanisms in protozoa, along with examples of organisms. Additionally, it requests a diagram to illustrate a specific group of organisms, Acanthocephala.
Answer
Protozoa use phagocytosis; contractile vacuoles regulate water; corona aids feeding; flame cells excrete waste; cysts protect; nematocysts sting.
Protozoa feed through methods like phagocytosis and endocytosis. Contractile vacuoles expel excess water (e.g., Paramecium). The corona, found in rotifers, aids in feeding and locomotion. Flame cells, used by flatworms, help excrete waste. Cysts protect dormant stages of organisms like Giardia. Nematocysts are stinging structures in cnidarians like jellyfish. Acanthocephala show a spiny proboscis for attachment, digesting nutrients via their tegument.
Answer for screen readers
Protozoa feed through methods like phagocytosis and endocytosis. Contractile vacuoles expel excess water (e.g., Paramecium). The corona, found in rotifers, aids in feeding and locomotion. Flame cells, used by flatworms, help excrete waste. Cysts protect dormant stages of organisms like Giardia. Nematocysts are stinging structures in cnidarians like jellyfish. Acanthocephala show a spiny proboscis for attachment, digesting nutrients via their tegument.
More Information
Protozoa exhibit diverse feeding mechanisms akin to multicellular systems, reflecting their evolutionary adaptability in various environments.
Tips
Confusing the functions of structures like cysts and nematocysts is common. Relate cysts to protection and dormancy, nematocysts to defense and prey capture.
Sources
- Protozoan - Mechanisms of food ingestion - britannica.com
- Contractile Vacuole | Definition, Function & Examples - study.com
- Excretion Systems - Contractile Vacuoles in Microorganisms - bio.libretexts.org
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