Evolution of Animals and Traditional Classification
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Questions and Answers

Which of the following characteristics is unique to most animals compared to other eukaryotes?

  • Ability to synthesize their own food through photosynthesis
  • Absence of an extracellular matrix to provide structural support (correct)
  • Presence of a rigid cell wall
  • Lack of a nervous system to respond to environmental stimuli

Which type of tissue in animals allows for rapid response to environmental changes?

  • Nervous tissue (correct)
  • Epithelial tissue
  • Muscle tissue
  • Connective tissue

Which germ layer in animal embryonic development gives rise to the nervous system and sensory organs?

  • Mesoderm
  • Ectoderm (correct)
  • Endoderm
  • Mesenchyme

Which type of symmetry is most common in the animal kingdom?

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

Which of the following is a key characteristic that distinguishes animal cells from plant cells?

<p>Lack of an extracellular matrix (A)</p> Signup and view all the answers

What is the primary function of the Hox genes found in most animals?

<p>To pattern the body axis during embryonic development (C)</p> Signup and view all the answers

Which of the following is a characteristic used to classify animals based on their body plans?

<p>Number of germ layers (B)</p> Signup and view all the answers

Which group of animals is characterized by the absence of specialized tissues or organs?

<p>Parazoa (D)</p> Signup and view all the answers

Which of the following is a characteristic that distinguishes the Eumetazoa from the Parazoa?

<p>Possession of more than one type of tissue and organs (C)</p> Signup and view all the answers

Which of the following groups of animals is characterized by radial symmetry?

<p>Cnidaria and Echinodermata (B)</p> Signup and view all the answers

Which of the following is a group of single-celled organisms that is considered the closest living relative of animals?

<p>Choanoflagellata (B)</p> Signup and view all the answers

Which of the following statements about germ layers is true?

<p>The number of germ layers varies among different animal groups (B)</p> Signup and view all the answers

Which of the following is NOT a characteristic feature of animals?

<p>Autotrophy (B)</p> Signup and view all the answers

Which of the following germ layers gives rise to the nervous system and sensory organs in animals?

<p>Ectoderm (A)</p> Signup and view all the answers

Which of the following types of symmetry is exhibited by organisms such as jellyfish and sea anemones?

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

Which of the following body plans is characteristic of organisms such as flatworms and roundworms?

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

Which of the following statements about animal reproduction is NOT true?

<p>All animals reproduce asexually. (A)</p> Signup and view all the answers

Which of the following tissues is unique to animals and plays a crucial role in their movement?

<p>Muscle tissue (B)</p> Signup and view all the answers

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