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Biology: Animal Characteristics and Classification
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Biology: Animal Characteristics and Classification

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Questions and Answers

What is a characteristic of animal cells?

  • They are prokaryotic
  • They have a cell wall
  • They are autotrophic
  • They have a true nucleus (correct)
  • What is a characteristic of animals?

  • They are autotrophic
  • They are eukaryotic (correct)
  • They are unable to move
  • They are single-celled
  • Which phylum includes insects, arachnids, and crustaceans?

  • Arthropoda (correct)
  • Mollusca
  • Echinodermata
  • Chordata
  • What type of symmetry do animals with body parts arranged around a central axis have?

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

    What is the function of the nervous system in animals?

    <p>To provide sensory and motor functions</p> Signup and view all the answers

    What does an animal's heterotrophic nature mean?

    <p>It cannot produce its own food</p> Signup and view all the answers

    Study Notes

    Definition and Characteristics

    • An animal is a living organism that is heterotrophic (cannot produce its own food) and multicellular.
    • Animals are eukaryotic, meaning their cells have a true nucleus.
    • They are capable of movement and responding to stimuli.
    • Animals can be found in various shapes, sizes, and habitats.

    Classification

    • Kingdom Animalia is divided into several phyla, including:
      • Chordata (vertebrates and some invertebrates)
      • Arthropoda (insects, arachnids, and crustaceans)
      • Mollusca (squids, octopuses, and shellfish)
      • Echinodermata (starfish, sea urchins, and sea cucumbers)
    • Subgroups within phyla include classes, orders, families, genera, and species.

    Body Structure

    • Animals can have:
      • Radial symmetry (body parts arranged around a central axis)
      • Bilateral symmetry (body parts arranged on both sides of a central axis)
    • Body cavities:
      • Coelom (fluid-filled cavity between body wall and digestive system)
      • Pseudocoelom (fluid-filled cavity between body wall and digestive system, but not completely lined with mesoderm)
    • Body systems:
      • Nervous system (sensory and motor functions)
      • Circulatory system (blood circulation and oxygen delivery)
      • Respiratory system (breathing and gas exchange)
      • Digestive system (food intake, digestion, and nutrient absorption)

    Nutrition and Digestion

    • Animals are heterotrophic, meaning they obtain energy from consuming other organisms or organic matter.
    • Types of nutrition:
      • Herbivory (plant-based diet)
      • Carnivory (animal-based diet)
      • Omnivory (both plant- and animal-based diet)
    • Digestive processes:
      • Mechanical digestion (breaking down food into smaller pieces)
      • Chemical digestion (breaking down food into nutrients)

    Reproduction and Development

    • Modes of reproduction:
      • Sexual reproduction (involving gametes and fertilization)
      • Asexual reproduction (involving only one parent)
    • Developmental stages:
      • Zygote (fertilized egg)
      • Embryo (early developmental stage)
      • Larva (juvenile stage)
      • Adult (mature stage)

    Definition and Characteristics

    • Animals are heterotrophic multicellular living organisms that cannot produce their own food.
    • They are eukaryotic, meaning their cells have a true nucleus.
    • Animals are capable of movement and responding to stimuli.
    • They can be found in various shapes, sizes, and habitats.

    Classification

    • Kingdom Animalia is divided into several phyla, including Chordata, Arthropoda, Mollusca, and Echinodermata.
    • Chordata includes vertebrates and some invertebrates.
    • Arthropoda includes insects, arachnids, and crustaceans.
    • Mollusca includes squids, octopuses, and shellfish.
    • Echinodermata includes starfish, sea urchins, and sea cucumbers.
    • Phyla are further divided into classes, orders, families, genera, and species.

    Body Structure

    • Animals can have radial or bilateral symmetry.
    • Radial symmetry means body parts are arranged around a central axis.
    • Bilateral symmetry means body parts are arranged on both sides of a central axis.
    • Animals have body cavities, including coelom and pseudocoelom.
    • Coelom is a fluid-filled cavity between the body wall and digestive system.
    • Pseudocoelom is a fluid-filled cavity between the body wall and digestive system, but not completely lined with mesoderm.
    • Animals have body systems, including nervous, circulatory, respiratory, and digestive systems.
    • The nervous system is responsible for sensory and motor functions.
    • The circulatory system is responsible for blood circulation and oxygen delivery.
    • The respiratory system is responsible for breathing and gas exchange.
    • The digestive system is responsible for food intake, digestion, and nutrient absorption.

    Nutrition and Digestion

    • Animals are heterotrophic, meaning they obtain energy from consuming other organisms or organic matter.
    • Types of nutrition include herbivory, carnivory, and omnivory.
    • Herbivory involves a plant-based diet.
    • Carnivory involves an animal-based diet.
    • Omnivory involves both plant- and animal-based diet.
    • Digestive processes include mechanical and chemical digestion.
    • Mechanical digestion involves breaking down food into smaller pieces.
    • Chemical digestion involves breaking down food into nutrients.

    Reproduction and Development

    • Modes of reproduction include sexual and asexual reproduction.
    • Sexual reproduction involves gametes and fertilization.
    • Asexual reproduction involves only one parent.
    • Developmental stages include zygote, embryo, larva, and adult.
    • A zygote is a fertilized egg.
    • An embryo is an early developmental stage.
    • A larva is a juvenile stage.
    • An adult is a mature stage.

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    Description

    Explore the definition and characteristics of animals, including their heterotrophic nature, cellular structure, and abilities. Learn about the classification of animals into different phyla.

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