Ch 3: Relationship between body plan and modes of living
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Questions and Answers

Which characteristic determines an organism's overall structural organization?

  • Symmetry (correct)
  • Habitat
  • Tissue Organization
  • Body Cavities

    • What type of animal is likely to be sessile or free-floating?

  • Diploblastic animals
  • Vertebrates
  • Radially symmetric animals (correct)
  • Animals with bilateral symmetry

    • Which layer allows for greater structural complexity and organ specialization?

  • Exoderm
  • Endoderm
  • Triploblastic layer
  • Mesoderm (correct)

    • The presence of a coelom provides space for what in animals?

    <p>Organ development</p> Signup and view all the answers

    Which type of symmetry refers to symmetry around a central axis?

    <p>Radial symmetry</p> Signup and view all the answers

    What allows most bilaterians to have greater organ specialization?

    <p>Three germ layers</p> Signup and view all the answers

    Animals with bilateral symmetry are often what in terms of mobility?

    <p>Actively mobile</p> Signup and view all the answers

    What is the main purpose of a body cavity like a coelom?

    <p>For organ development</p> Signup and view all the answers

    Which feature of animals allows for mirror-image symmetry along a central plane?

    <p>Symmetry</p> Signup and view all the answers

    Which type of animals are typically sessile or free-floating?

    <p>Radially symmetric animals</p> Signup and view all the answers

    Which type of animals lack a true coelom altogether?

    <p>Flatworms</p> Signup and view all the answers

    What is a characteristic adaptation of aquatic organisms for respiration?

    <p>Gills</p> Signup and view all the answers

    What is a common feature of sessile organisms?

    <p>Filter-feeding mechanisms</p> Signup and view all the answers

    Which group of animals primarily exhibits radial symmetry?

    <p>Cnidarians</p> Signup and view all the answers

    What is a characteristic of arthropods related to their body covering?

    <p>Exoskeleton</p> Signup and view all the answers

    In which phylum are earthworms and leeches classified?

    <p>Annelida</p> Signup and view all the answers

    What adaptation do vertebrates possess for aerial respiration?

    <p>Lungs</p> Signup and view all the answers

    What distinguishes flatworms from other animal groups in terms of body structure?

    <p>Dorsoventrally flattened bodies</p> Signup and view all the answers

    Which phylum includes animals with a porous body structure and choanocytes for filter-feeding?

    <p>Porifera</p> Signup and view all the answers

    What do parasites derive from a host organism at the host's expense?

    <p>Nutrients</p> Signup and view all the answers

    What type of adaptation do aquatic organisms exhibit for efficient swimming?

    <p>Streamlined limb structures</p> Signup and view all the answers

    Which of the following is NOT a challenge faced by terrestrial organisms?

    <p>High salinity</p> Signup and view all the answers

    What is a key distinguishing feature of parasites in terms of their nutrition?

    <p>Derive nutrients at the host's expense</p> Signup and view all the answers

    Which phylum is exclusively aquatic and often exhibits a sessile lifestyle attached to substrates?

    <p>Porifera</p> Signup and view all the answers

    What enables vertebrates to exhibit a wide range of body plans adapted to aquatic, terrestrial, and aerial environments?

    <p>A coelom and complex organ systems</p> Signup and view all the answers

    What is a common morphological adaptation observed in animals with complex life cycles involving multiple hosts?

    <p>Specialized attachment structures</p> Signup and view all the answers

    Which body plan feature is characteristic of annelids like earthworms and leeches?

    <p>Hydrostatic skeleton and a coelom</p> Signup and view all the answers

    Why do sessile organisms rely on passive means like water currents or wind for food and oxygen delivery?

    <p>Limited mobility for active hunting</p> Signup and view all the answers

    Which group of organisms primarily have a dorsoventrally flattened body structure?

    <p>Flatworms</p> Signup and view all the answers

    What is a crucial feature that allows arthropods to thrive in diverse terrestrial, aquatic, and aerial habitats?

    <p>Exoskeletons and jointed appendages</p> Signup and view all the answers

    How does the body plan relate to an organism's mode of living?

    <p>It influences the organism's habitat, behavior, and ecological niche</p> Signup and view all the answers

    What type of symmetry do vertebrates, which actively seek out food and mates, exhibit?

    <p>Bilateral symmetry</p> Signup and view all the answers

    What is the significance of having ectoderm, endoderm, and mesoderm layers in triploblastic animals?

    <p>Enhanced structural complexity and organ specialization</p> Signup and view all the answers

    Why do some animals possess a body cavity like a coelom?

    <p>To provide space for organ development and movement</p> Signup and view all the answers

    What type of animals are likely to be sessile or free-floating due to their radial symmetry?

    <p>Jellyfish</p> Signup and view all the answers

    Which feature distinguishes bilaterally symmetric animals from radially symmetric animals?

    <p>Exhibiting mirror-image symmetry along a central plane</p> Signup and view all the answers

    What allows animals with three germ layers to have greater structural complexity?

    <p>Triploblastic organization</p> Signup and view all the answers

    Why are bilaterally symmetric animals often more mobile compared to radially symmetric organisms?

    <p>To actively seek out food and mates</p> Signup and view all the answers

    What type of animals are likely to lack a true coelom altogether?

    <p>Jellyfish</p> Signup and view all the answers

    Why are triploblastic animals better suited for organ specialization compared to diploblastic creatures?

    <p>Due to the presence of three germ layers</p> Signup and view all the answers

    What is a key characteristic that distinguishes coelomates from pseudocoelomates and acoelomates?

    <p>Lining of the body cavity</p> Signup and view all the answers

    Which feature is NOT a characteristic adaptation of terrestrial organisms for life on land?

    <p>Buoyancy mechanisms</p> Signup and view all the answers

    What is a common characteristic of sessile organisms in terms of their attachment to a substrate?

    <p>Relying on water currents for attachment</p> Signup and view all the answers

    Which phylum primarily includes animals with a porous body structure and choanocytes for filter-feeding?

    <p>Porifera</p> Signup and view all the answers

    What do parasitic organisms derive from a host organism at the host's expense?

    <p>Nutrients and water</p> Signup and view all the answers

    Why do planktonic aquatic organisms often exhibit streamlined body shapes for efficient swimming?

    <p>To reduce drag resistance in water</p> Signup and view all the answers

    What enables arthropods to thrive in diverse terrestrial, aquatic, and aerial habitats?

    <p>Segmented body plan</p> Signup and view all the answers

    What is a significant feature that allows vertebrates to exhibit diverse body plans for different environments?

    <p>Bilateral symmetry</p> Signup and view all the answers

    Which adaptation is often observed in certain parasites with complex life cycles involving multiple hosts?

    <p>Morphological changes for each host stage</p> Signup and view all the answers

    What type of symmetry distinguishes cnidarians like jellyfish and corals from vertebrates such as mammals?

    <p>Radial symmetry</p> Signup and view all the answers

    Why do radially symmetric animals like jellyfish tend to be sessile or free-floating?

    <p>Because they lack mobility structures like limbs</p> Signup and view all the answers

    What advantage does bilateral symmetry provide to mobile animals compared to radially symmetric organisms?

    <p>Enables them to move more efficiently in search of food and mates</p> Signup and view all the answers

    Why do triploblastic animals have greater organ specialization compared to diploblastic creatures?

    <p>Because of the additional mesoderm layer enabling complex structures</p> Signup and view all the answers

    What function does a body cavity like a coelom serve in animals?

    <p>Offers space for organ development and movement</p> Signup and view all the answers

    Why are animals with bilateral symmetry often more active in seeking out food and mates compared to radially symmetric organisms?

    <p>For precise navigation and maneuvering in their environments</p> Signup and view all the answers

    What characteristic of triploblastic animals contributes to their ability to adapt to a wider range of environments?

    <p>Possessing greater structural complexity due to three germ layers</p> Signup and view all the answers

    Why might an organism with bilateral symmetry be at an advantage when avoiding predators compared to a radially symmetric organism?

    <p>Better detection of approaching predators from all directions</p> Signup and view all the answers

    What evolutionary advantage does the possession of a body cavity like a coelom offer to developing organisms?

    <p>Facilitates the development and growth of complex organ systems</p> Signup and view all the answers

    Why are triploblastic animals more likely to have specialized organs than diploblastic organisms?

    <p>Due to the presence of mesoderm allowing for organ complexity</p> Signup and view all the answers

    How does having a coelom benefit animals with a complex body plan?

    <p>Offers cushioning and support for internal organs</p> Signup and view all the answers

    What feature distinguishes coelomates from acoelomates?

    <p>Presence of a body cavity</p> Signup and view all the answers

    Which adaptation is commonly found in animals living in aquatic environments?

    <p>Buoyancy mechanisms for swimming</p> Signup and view all the answers

    What is a key characteristic of sessile organisms?

    <p>Attachment to a substrate</p> Signup and view all the answers

    Which group of animals is primarily found in marine habitats and often exhibits free-swimming lifestyles?

    <p>Platyhelminthes</p> Signup and view all the answers

    What distinguishes flatworms from annelids?

    <p>Dorsoventrally flattened bodies</p> Signup and view all the answers

    In which phylum can you find animals with specialized stinging cells called cnidocytes?

    <p>Cnidaria</p> Signup and view all the answers

    What is a common feature among arthropods that allows them to thrive in various habitats?

    <p>Exoskeletons</p> Signup and view all the answers

    What distinguishes parasitic organisms from other groups in terms of nutrition?

    <p>Deriving nutrients at the host's expense</p> Signup and view all the answers

    How do terrestrial organisms differ from sessile organisms?

    <p>Move freely</p> Signup and view all the answers

    What body symmetry is commonly associated with animals relying on water currents for food and oxygen?

    <p>Radial symmetry</p> Signup and view all the answers

    Why are bilaterally symmetric animals like vertebrates often more mobile compared to radially symmetric organisms?

    <p>Since they actively seek out food and mates with their directional body plan</p> Signup and view all the answers

    What is a typical physical characteristic of radially symmetric animals like jellyfish that influences their lifestyle?

    <p>Being sessile or free-floating due to their body form</p> Signup and view all the answers

    Why do triploblastic animals typically exhibit greater organ specialization compared to diploblastic organisms?

    <p>Due to the presence of three germ layers allowing for more complex structures</p> Signup and view all the answers

    What benefit does having a body cavity like a coelom provide for some animals?

    <p>Provides space for organ development and movement</p> Signup and view all the answers

    How does the possession of bilateral symmetry benefit mobile organisms in locating food and mates?

    <p>By having a directional body plan for movement efficiency</p> Signup and view all the answers

    Why are radially symmetric animals like jellyfish often sessile or free-floating in their habitats?

    <p>Possession of radial symmetry around a central axis</p> Signup and view all the answers

    What distinguishes triploblastic animals from diploblastic creatures in terms of organ complexity?

    <p>Having ectoderm, endoderm, and mesoderm layers for tissue structures</p> Signup and view all the answers

    How do radially symmetric animals like jellyfish typically obtain nutrients?

    <p>Through direct absorption via their skin</p> Signup and view all the answers

    Why do bilaterally symmetric animals with mesoderm layers exhibit greater complexity in organ development?

    <p>With the presence of three germ layers allowing for specialized organs</p> Signup and view all the answers

    What advantage does bilateral symmetry offer vertebrates in terms of habitat adaptation?

    <p>Enhanced mobility for seeking out various habitats</p> Signup and view all the answers

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