Phylum Platyhelminthes: The Flat Worms

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Phylum Platyhelminthes: The Flat Worms - Quiz

Phylum Platyhelminthes - Classes Turbellaria, Trematoda and Cestoda. Lab Exam.


Questions and Answers
  • 1. 

    Flat worms have three germ layers, what is the third germ layer called?

    Explanation
    Flat worms, also known as platyhelminthes, are simple organisms that have three germ layers during embryonic development. The third germ layer is called mesoderm. This layer gives rise to various tissues and structures such as muscles, reproductive organs, and the circulatory system. The mesoderm plays a crucial role in the overall development and complexity of flat worms.

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  • 2. 

    Are flatworms .....

    • A.

      Diploblastic

    • B.

      Triploblastic

    • C.

      UnoBlastic

    Correct Answer
    B. Triploblastic
    Explanation
    Flatworms are triploblastic, meaning they have three germ layers during their embryonic development. These germ layers give rise to different tissues and organs in the body. In triploblastic organisms, the three germ layers are the ectoderm (outer layer), mesoderm (middle layer), and endoderm (inner layer). This allows flatworms to have more complex body structures and organ systems compared to diploblastic organisms, which have only two germ layers. Unoblastic is not a valid term or classification for organisms.

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  • 3. 

    There is no internal body cavity on flatworms, so flatworms are termed _____________ (no body cavity).

    Correct Answer
    Acoelomates
    Explanation
    Flatworms are referred to as acoelomates because they lack an internal body cavity. In acoelomates, the space between the body wall and the digestive tract is filled with mesenchyme, a loose connective tissue. This absence of a body cavity allows for a more direct interaction between the cells and the external environment, facilitating the exchange of nutrients and waste. Acoelomates have a simpler body structure compared to animals with a body cavity, such as coelomates or pseudocoelomates.

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  • 4. 

    Flatworms exhibit what kind of symmetry?

    Correct Answer
    bilateral
    Explanation
    Flatworms exhibit bilateral symmetry, which means that their bodies can be divided into two equal halves along a single plane. This symmetry allows them to have a distinct head and tail region, as well as a left and right side. This type of symmetry is advantageous for flatworms as it allows for efficient movement and coordination. Additionally, bilateral symmetry is common in animals that have a defined direction of movement, such as forward or backward.

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  • 5. 

    What class is the genus Dugesia located in?

    Correct Answer
    Turbellaria
    Explanation
    The genus Dugesia is located in the class Turbellaria. Turbellaria is a class of flatworms that are free-living and mainly aquatic. They are characterized by their soft, flattened bodies and ciliated epidermis. Dugesia is a genus of planarians, which are a type of turbellarian flatworms. They are known for their ability to regenerate and are commonly used in scientific research. Therefore, the correct answer is Turbellaria.

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  • 6. 

    Genus Fasciola is located in what class?

    Correct Answer
    Trematoda
    Explanation
    The correct answer is Trematoda because Genus Fasciola belongs to the class Trematoda. Trematoda is a class of parasitic flatworms, commonly known as flukes, which have complex life cycles involving both intermediate and definitive hosts. Fasciola is a genus of flukes that includes species such as Fasciola hepatica, the liver fluke. These flukes infect various mammals, including humans, and cause diseases such as fascioliasis.

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  • 7. 

    Genus Schistosoma is located in what class?

    Correct Answer
    Trematoda
    Explanation
    The correct answer is Trematoda because Schistosoma is a genus of parasitic flatworms, commonly known as blood flukes, which belong to the class Trematoda. Trematoda is a class of parasitic flatworms that includes various species of flukes, including Schistosoma.

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  • 8. 

    Genus Clonorchis is located in what class?

    Correct Answer
    Trematoda
    Explanation
    Genus Clonorchis is located in the class Trematoda. Trematoda is a class of parasitic flatworms, commonly known as flukes. These organisms have a complex life cycle involving multiple hosts and are characterized by a leaf-shaped body with suckers. Clonorchis is a genus of trematodes that includes species such as Clonorchis sinensis, which is the causative agent of clonorchiasis in humans. This parasitic infection primarily affects the liver and bile ducts. Therefore, it is accurate to say that Genus Clonorchis is located in the class Trematoda.

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  • 9. 

    Genus Taenia is located in what class?

    Correct Answer
    Cestoda
    Explanation
    The genus Taenia belongs to the class Cestoda. Cestoda is a class of parasitic flatworms commonly known as tapeworms. These organisms have a long, segmented body and are found in the intestines of vertebrates. Taenia is a genus of tapeworms that infects humans and animals, causing diseases such as taeniasis and cysticercosis. Therefore, the correct answer is Cestoda.

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  • 10. 

    What genus is this?

    Correct Answer
    Schistosoma
    Explanation
    The given answer "Schistosoma" is the correct genus for the organism in question. Schistosoma is a genus of parasitic flatworms, commonly known as blood flukes, that infect humans and other mammals. These worms cause schistosomiasis, a disease that affects millions of people worldwide. The genus Schistosoma includes several species, such as Schistosoma mansoni and Schistosoma japonicum, each with its own specific characteristics and geographical distribution. Therefore, based on the information provided, the correct answer is Schistosoma.

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  • 11. 

    What genus is this?

    Correct Answer
    Dugesia
    Explanation
    Dugesia is the correct answer because it is the genus of the organism being referred to in the question. The question is asking for the specific genus of the organism, and Dugesia is the correct response to that question.

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  • 12. 

    What is the pointer pointing at called?

    Correct Answer
    Ocelli
    Explanation
    The pointer is called Ocelli.

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  • 13. 

    What is the pointer pointing at?

    Correct Answer
    Auricles
    Explanation
    The pointer is pointing at the auricles.

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  • 14. 

    What is the genus of this species?

    Correct Answer
    Fasciola
  • 15. 

    Give the name the pointer is pointing at.

    Correct Answer
    Ventral Sucker
  • 16. 

    Give the name the pointer is pointing at.

    Correct Answer
    Testes
  • 17. 

    Name the thing the pointer is pointing at.

    Correct Answer
    Uterus
    Explanation
    The pointer is pointing at the uterus.

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  • 18. 

    Name the thing the pointer is pointing at.

    Correct Answer
    Esophagus
    Explanation
    The pointer is pointing at the esophagus.

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  • 19. 

    Name the thing the pointer is pointing at.

    Correct Answer
    Oral Sucker
    Explanation
    The pointer is pointing at an oral sucker.

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  • 20. 

    What genus is this species?

    Correct Answer
    Clonorchis
    Explanation
    The given species is Clonorchis. The question is asking for the genus of this species. In this case, the genus and species name are the same, which is Clonorchis.

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  • 21. 

    What is the genus of this species?

    Correct Answer
    Fasciola

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 23, 2011
    Quiz Created by
    Caellic

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