Bio1331 Animals - Evolution - Lophotrochozoans (Lecture Four)

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  • 1/11 Questions

    Complete the following sentence:Mollusks have a _________, a fold of tissue that covers the organs of the visceral mass, secreting a hard, calcareous shell.

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About This Quiz

Explore the evolution and distinctive features of Lophotrochozoans in this focused educational module, BIO1331. Assess your understanding of protostome development, the traits that define Lophotrochozoans, and their classification within the animal kingdom. Ideal for students of biology looking to deepen their knowledge in animal evolution.

Bio1331 Animals - Evolution - Lophotrochozoans (Lecture Four) - Quiz

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  • 2. 

    Complete the following sentence:One of the components of a mollusk's tripartite body is the _______________, containing most of the organism's internal organs.

    Explanation
    The correct answer is "Visceral mass." In mollusks, the visceral mass is one of the three main components of their body. It houses the majority of the organism's internal organs, such as the digestive, reproductive, and excretory systems. The visceral mass is protected by the mollusk's hard outer shell and plays a crucial role in the overall functioning and survival of the organism.

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  • 3. 

    What is the Scientific name for flatworms?

    Explanation
    The scientific name for flatworms is Platyhelminthes. This name is derived from the Greek words "platys" meaning flat and "helminth" meaning worm. Flatworms are a phylum of invertebrates that have a soft, flattened body shape. They are characterized by their simple body structure and lack of a body cavity. Platyhelminthes include various species such as planarians, tapeworms, and flukes.

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  • 4. 

    What is the "Scientific" name for segmented worms?

    Explanation
    The scientific name for segmented worms is "Annelids". Annelids are a phylum of invertebrates that includes earthworms, leeches, and marine worms. They are characterized by their segmented bodies, which allows for flexibility and movement. The term "annelid" is derived from the Latin word "annellus", meaning "little ring", referring to the rings or segments that make up their body structure.

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  • 5. 

    Lophotrochozoans have two main important features that set them apart from ecdysozoans.Name one of these two features.

    Explanation
    Lophotrochozoans have a unique feature called lophophores, which is one of the two main characteristics that distinguish them from ecdysozoans. The lophophore is a specialized feeding structure found in certain groups of lophotrochozoans, such as brachiopods, bryozoans, and phoronids. It is a horseshoe-shaped or circular organ with ciliated tentacles that surround the mouth, enabling filter feeding and gas exchange. This feature is not present in ecdysozoans, making it a defining characteristic of lophotrochozoans.

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  • 6. 

    What is the other name for a Bryozoan?

    Explanation
    The correct answer is "ectoproct". An ectoproct is another name for a Bryozoan, which is a phylum of small aquatic invertebrates. They are colonial animals that form colonies of interconnected individuals called zooids. The zooids have a hard exoskeleton and a ring of tentacles surrounding a mouth-like opening. Ectoproct is the commonly used term to refer to these organisms.

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  • 7. 

    True or False?All protostomes are triploblastic.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    All protostomes are triploblastic because protostomes are a group of animals that develop from a blastopore, which is the opening of the developing embryo. Triploblastic refers to having three germ layers: the ectoderm, mesoderm, and endoderm. All protostomes, including insects, mollusks, and annelids, have these three germ layers during their development. Therefore, it can be concluded that all protostomes are triploblastic.

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  • 8. 

    Which of the following is the correct pattern of embryonic development for a protostome?

    • Spiral cleavage, determinate

    • Radial cleavage, determinate

    • Spiral cleavage, indeterminate

    • Radial cleavage, indeterminate

    Correct Answer
    A. Spiral cleavage, determinate
    Explanation
    Spiral cleavage refers to the pattern of cell division in which the cells divide at an angle to the polar axis of the embryo, resulting in a spiral arrangement of cells. Determinate cleavage means that the fate of each cell is already determined early on in development, meaning that if a cell is removed or damaged, it cannot develop into a complete organism. Therefore, the correct pattern of embryonic development for a protostome is spiral cleavage, determinate.

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  • 9. 

    There are two clades of protostomes.Name one of those clades.

    Correct Answer
    Lophotrochozoans
    Ecdysozoans
    The lophotrochozoans
    The ecdysozoans
    The lophotrochozoan
    The ecdysozoan
    Lophotrochozoan
    Ecdysozoan
    Explanation
    The correct answer is Lophotrochozoans and Ecdysozoans. These are the two clades of protostomes.

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  • Mar 19, 2023
    Quiz Edited by
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  • Nov 23, 2015
    Quiz Created by
    Elly Crook
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