Phylum Platyhelminthes, Class Turbellaria

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Phylum Quizzes & Trivia

Today, we’ll be looking at another member of the phylum Platyhelminthes; the Turbellaria! These are members of the flatworm phylum and are not exclusively parasitic. What do you know about them? Let’s take a look!


Questions and Answers
  • 1. 

    How many species are found in the class turbellaria

    • A.

      Over 200

    • B.

      Over 300

    • C.

      Over 400

    • D.

      Over 450

    Correct Answer
    B. Over 300
    Explanation
    The correct answer is "over 300". This suggests that there are more than 300 species found in the class Turbellaria.

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  • 2. 

    Most in the class Turbellaria are ____ cm up to ___ cm

    • A.

      1, 50

    • B.

      1, 30

    • C.

      1, 100

    Correct Answer
    A. 1, 50
    Explanation
    Most of the Turbellaria in the class are typically around 1 cm in length, with some individuals growing up to 50 cm.

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  • 3. 

    Species in the class turbellaria are _________ and predators. 

    Correct Answer
    scavengers
    Explanation
    Species in the class turbellaria are scavengers because they feed on dead organic matter and other small organisms. They are not parasites or herbivores, as they do not rely on living hosts or plants for their food source. Instead, they actively hunt and consume prey, making them predators in their ecosystem.

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  • 4. 

    Rhabdites are ___ like specialized ________ cells, that form the protective _______ sheath.

    Correct Answer
    rod, epidermal, mucous
    Explanation
    Rhabdites are rod-like specialized epidermal cells that form the protective mucous sheath. These cells are responsible for producing and secreting mucous, which helps in various functions such as lubrication, protection against pathogens, and facilitating movement. The rod-like shape of rhabdites allows them to align closely together, forming a cohesive and efficient protective layer.

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  • 5. 

    Turbellarians have _______ glands and ________ glands. The first attaches to substrates. The latter releases a chemical to dissolve sticky substrate.

    Correct Answer
    adhesive, releaser
    Explanation
    Turbellarians have adhesive glands and releaser glands. The adhesive glands allow them to attach to substrates, while the releaser glands release a chemical that dissolves sticky substrates.

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  • 6. 

    Turbellarians move by ______ using cilia and/or muscular ________.

    Correct Answer
    gliding, undulations
    Explanation
    Turbellarians move by gliding, which means they smoothly slide over surfaces. They achieve this movement by using cilia, which are hair-like structures that beat in coordinated waves, and/or muscular undulations, which are rhythmic contractions and relaxations of their muscles.

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  • 7. 

    Digestion in turbellarians is partly _______; enzymes secreted from _________ glands break down food outside the body.

    Correct Answer
    extracellular, pharyngeal
    Explanation
    Turbellarians have an extracellular digestion process, meaning that food is broken down outside the body. Enzymes are secreted from the pharyngeal glands to aid in the breakdown of food.

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  • 8. 

    Waste and gas exchange occurs by ________ through the body wall.

    Correct Answer
    diffusion
    Explanation
    Waste and gas exchange in the body occurs through diffusion, which is the process of molecules moving from an area of high concentration to an area of low concentration. In this case, waste and gases move across the body wall through diffusion, allowing for the exchange of these substances between the internal and external environments.

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  • 9. 

    ___________ turbellarians are in osmotic balance with their environment .

    • A.

      Freshwater

    • B.

      Marine

    Correct Answer
    B. Marine
    Explanation
    Marine turbellarians are in osmotic balance with their environment because they live in saltwater, which has a higher concentration of solutes compared to their body fluids. This allows them to maintain a stable internal environment by osmosis, where water and solutes move across their cell membranes to equalize the concentration on both sides. As a result, they do not gain or lose excessive amounts of water or solutes, ensuring their osmotic balance.

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  • 10. 

    Freshwater turbellarians are ____________ with their environment

    Correct Answer
    hypertonic
    Explanation
    Freshwater turbellarians are hypertonic with their environment. This means that the concentration of solutes in their body fluids is higher than the concentration of solutes in the surrounding freshwater. As a result, water tends to move into their bodies through osmosis, causing them to constantly excrete excess water and maintain a balance of solutes. This adaptation allows them to survive in freshwater environments where they are constantly exposed to a hypotonic environment.

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  • 11. 

    The turbellarians nervous system ranges from primitive ______ ___ to a ______ like system.

    Correct Answer
    nerve net, ladder
    Explanation
    The statement suggests that the turbellarians have a nervous system that varies in complexity. The first part of the statement indicates that their nervous system can be primitive, which suggests a nerve net organization. The second part of the statement suggests that their nervous system can also be more advanced, resembling a ladder-like system. Therefore, the correct answer is nerve net, ladder.

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  • 12. 

    Have sensory and ______ neurons and they are capable of integrating and responding to _______.

    Correct Answer
    motor, stimuli
    Explanation
    Motor neurons and sensory neurons are two types of neurons in the nervous system. Motor neurons transmit signals from the central nervous system to muscles or glands, allowing for movement and response. Sensory neurons, on the other hand, receive information from sensory receptors and transmit it to the central nervous system for processing. Both types of neurons are capable of integrating and responding to stimuli, which are any changes in the environment that can be detected by the sensory system.

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  • 13. 

    ________ are sensory lobes projecting from the side of the head containing _______ receptors.

    Correct Answer
    Auricles, chemo
    Explanation
    Auricles are sensory lobes projecting from the side of the head. These auricles contain chemo receptors, which are responsible for detecting chemical stimuli.

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  • 14. 

    Turbellarians have ______ which are photosensitive areas containing ______ receptors.

    Correct Answer
    ocelli, photo
    Explanation
    Turbellarians have ocelli, which are photosensitive areas containing photo receptors. Ocelli are simple eyes found in many invertebrates, including flatworms like turbellarians. These eyes are capable of detecting light and are important for sensing changes in light intensity or direction. The photo receptors within the ocelli allow turbellarians to perceive and respond to light stimuli in their environment.

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  • 15. 

    During asexual reproduction, _______ fission is used that creats two new animals called _____.

    Correct Answer
    transverse, zooids
    Explanation
    During asexual reproduction, transverse fission is used, where the parent organism divides into two equal parts horizontally. This process creates two new animals called zooids. Zooids are individual organisms that are capable of independent existence and can function as a separate entity.

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  • 16. 

    Reproductive organs are __________ in orgin.

    Correct Answer
    mesodermal
    Explanation
    Reproductive organs are mesodermal in origin. This means that they develop from the mesoderm, one of the three primary germ layers in the early embryo. The mesoderm gives rise to various structures in the body, including the reproductive system. This includes the formation of the gonads (ovaries or testes), as well as other structures such as the uterus, fallopian tubes, and vas deferens. The mesodermal origin of reproductive organs is a fundamental aspect of their development and function.

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  • 17. 

    Typically ______ __________ with direct development.

    Correct Answer
    cross fertilize
    Explanation
    Typically, cross fertilize refers to the process of combining different ideas or concepts to create something new. In the context of the given question, it implies that cross fertilization occurs in a specific way, most likely in relation to direct development. This suggests that the process of cross fertilization is closely connected to the concept of direct development.

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  • 18. 

    Examples of Turbellarians are:

    • A.

      Schistosomes

    • B.

      Dugesia

    • C.

      Metacercaria

    • D.

      Convaluta

    Correct Answer(s)
    B. Dugesia
    D. Convaluta
    Explanation
    The correct answer includes the names "dugesia" and "Convaluta". These are examples of Turbellarians, which are a group of flatworms. Turbellarians are free-living, non-parasitic flatworms found in freshwater and marine environments. Dugesia is a genus of freshwater planarians, while Convaluta is a genus of marine flatworms.

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 24, 2010
    Quiz Created by
    Colleennicole

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