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Questions and Answers
Which characteristic is true about the Class Turbellaria within Phylum Platyhelminthes?
Which characteristic is true about the Class Turbellaria within Phylum Platyhelminthes?
What is a notable feature of the reproduction in Phylum Platyhelminthes?
What is a notable feature of the reproduction in Phylum Platyhelminthes?
Which statement is correct regarding the regeneration ability of Phylum Platyhelminthes?
Which statement is correct regarding the regeneration ability of Phylum Platyhelminthes?
What is true about the digestive and excretory systems of Phylum Platyhelminthes?
What is true about the digestive and excretory systems of Phylum Platyhelminthes?
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Which statement accurately describes the nervous system of Parasitic species in Phylum Platyhelminthes?
Which statement accurately describes the nervous system of Parasitic species in Phylum Platyhelminthes?
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What type of organisms are flukes and tapeworms in terms of reproduction?
What type of organisms are flukes and tapeworms in terms of reproduction?
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What is the characteristic feature of the head/scolex region of tapeworms?
What is the characteristic feature of the head/scolex region of tapeworms?
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Which part of the tapeworm body is responsible for segment proliferation?
Which part of the tapeworm body is responsible for segment proliferation?
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What is the main reproductive characteristic of tapeworms?
What is the main reproductive characteristic of tapeworms?
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Which larval form is found in cows and pigs as a stage in the life cycle of tapeworms?
Which larval form is found in cows and pigs as a stage in the life cycle of tapeworms?
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Which organ do flukes (Class Trematoda) possess that tapeworms lack?
Which organ do flukes (Class Trematoda) possess that tapeworms lack?
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What is a unique feature of the nervous system in tapeworms?
What is a unique feature of the nervous system in tapeworms?
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Where is the mouth usually located in Class Turbellaria flatworms?
Where is the mouth usually located in Class Turbellaria flatworms?
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What is the excretory system of Phylum Platyhelminthes characterized by?
What is the excretory system of Phylum Platyhelminthes characterized by?
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Which feature is characteristic of the nervous system in most Turbellarian flatworms?
Which feature is characteristic of the nervous system in most Turbellarian flatworms?
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How do flatworms in Phylum Platyhelminthes primarily reproduce?
How do flatworms in Phylum Platyhelminthes primarily reproduce?
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What is a notable ability exhibited by many species in relation to regeneration?
What is a notable ability exhibited by many species in relation to regeneration?
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Study Notes
Phylum Platyhelminthes: Characteristics
- Acoelomates, lacking a body cavity, resulting in a flat body structure
- Exhibit bilateral symmetry and are triploblastic
- Possess parenchyma tissue
- Have a centralized nervous system and a complex reproductive system
- Lack a body cavity and circulatory system, but have a simple excretory system
Reproduction
- Most species are simultaneous hermaphrodites
- Parasitic species have complex lifecycles with various hosts and larval stages
- Possess incredible powers of regeneration
Nervous System
- Free-living species have a well-developed sensory system
- Parasites have less elaborate systems
Class Turbellaria
- Most are free-living, tiny, and inconspicuous
- Primarily found in marine, freshwater, or moist terrestrial environments
- Examples include Dugesia (Planaria)
Digestion and Excretion
- Mouth is usually located at the anterior end or mid-body on the ventral surface
- Excretory system contains flame bulbs known as flame cells
Regeneration
- Many species possess remarkable powers of regeneration and repair wounds
Turbellarian Lifestyles
- Most are benthic
- Possess several nerve cords with a centralized ganglia (brain)
Class Cestoda (Tapeworms)
- Flattened, elongated, and consist of segments called proglottids
- Body divided into three parts: head/scolex with organs of attachment, neck region, and a chain of proglottids called the strobila
- All parasitic, without a gut, and hermaphroditic
- Examples include Taenia saginatta (beef tapeworm) and Taenia solium (pork tapeworm)
Proglottids
- Each tapeworm can have 3,000-4,000 proglottids
- Proglottids contain several ovaries and 1,000 distinct testes
- Immature proglottids are close to the neck, and matured proglottids are towards the end of the body
Life Cycle of Tapeworms
- Generalized life cycle involves multiple hosts and larval stages
- Examples of tapeworms include Hymenolepsis nana, H. diminuta, Taenia saginata, T. solium, Diphyllobothrium latum, and Dipylidium caninum
Class Trematoda (Flukes)
- All are external and internal parasites of other animals
- Have oral and ventral suckers positioned at different parts of the body with other organs of attachment
- Have a gut with a branched intestine and a well-developed reproductive system, but are never segmented
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Description
This quiz covers the classification, characteristics, and body plans of Phylum Platyhelminthes, focusing on their flatworm body structure, bilateral symmetry, acoelomate nature, and triploblastic composition. Test your knowledge on this phylum!
