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Overview of Animals quiz Flashcards

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Overview of Animals quiz
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  • What is the initial single cell called that eventually develops into a complex animal body?
    The initial single cell is called a zygote.
  • What are the three primary germ layers formed during gastrulation?
    The three primary germ layers are the ectoderm, mesoderm, and endoderm.
  • What is the difference between protostomes and deuterostomes in terms of the blastopore?
    In protostomes, the blastopore develops into the mouth, while in deuterostomes, it develops into the anus.
  • What type of cleavage is associated with protostomes?
    Protostomes are associated with spiral and determinate cleavage.
  • What type of cleavage is associated with deuterostomes?
    Deuterostomes are associated with radial and indeterminate cleavage.
  • What is the coelom and from which germ layer does it derive?
    The coelom is a body cavity that surrounds the digestive tract and it derives from the mesoderm.
  • What is the difference between a true coelom and a pseudocoelom?
    A true coelom is derived entirely from the mesoderm, while a pseudocoelom is derived from both the mesoderm and endoderm.
  • What type of body symmetry do most complex animals exhibit?
    Most complex animals exhibit bilateral symmetry.
  • What is cephalization and in which type of organisms is it commonly found?
    Cephalization is the concentration of nervous tissue at the anterior end of an organism, commonly found in animals with a central nervous system.
  • What are the two main body plans of Cnidarians?
    The two main body plans of Cnidarians are the polyp and the Medusa.
  • What specialized cells do Cnidarians use for stinging and capturing prey?
    Cnidarians use specialized cells called cnidocytes, which contain nematocysts.
  • What is the function of choanocytes in sponges?
    Choanocytes are flagellated cells that capture food particles and bacteria, performing intracellular digestion.
  • What is the mesohyl in sponges?
    The mesohyl is a gelatinous matrix that separates the two regions of a sponge's body and contains amoebocytes.
  • What is the significance of the Cambrian explosion in animal evolution?
    The Cambrian explosion is significant because it led to the rapid diversification and emergence of many bilateral animal phyla.
  • What is the role of the notochord in chordates?
    The notochord is a primitive backbone structure that in some animals develops into the vertebrae of the spine.
  • a mammal that reproduces by laying eggs, but still has milk, hair, and teeth refers to a(n) _____.
    Monotreme. Monotremes are a group of egg-laying mammals that include the platypus and echidnas. They possess mammalian characteristics such as milk production, hair, and teeth.
  • which of these is the definition of an animal?
    Animals are multicellular, heterotrophic eukaryotes that undergo complex embryonic development starting from a zygote. They lack cell walls and are motile at some stage of their life cycle.
  • which of the following statements about vertebrates is true?
    Vertebrates have a vertebral column that develops from the notochord and most are deuterostomes. They exhibit segmentation in their vertebral column.
  • how many segments do insect bodies have?
    Insect bodies are divided into three segments: the head, thorax, and abdomen.
  • which of the following statements are true about tarsiers?
    Tarsiers are small primates known for their large eyes and ability to rotate their heads almost 180 degrees. They are nocturnal and primarily insectivorous.