BIO 116 Lab 3: Phylum Nematoda (Roundworms) Characteristics

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Questions and Answers

What is the defining characteristic that separates the class Secernentea (Phasmidia) from the class Adenophorea (Aphasmidia)?

  • The presence of phasmids (correct)
  • The presence of a stichosome
  • The absence of amphids
  • The absence of esophageal glands

Which of the following statements about Trichuris trichiura (Whipworm) is incorrect?

  • The male is smaller and has a curled posterior end
  • The anterior part resembles a whip, hence the name 'Tricho-'
  • It lives in the small intestine and feeds on blood (correct)
  • It belongs to the order Trichinellida and family Trichuridae

Which of the following characteristics is associated with the subclass Chromadoria?

  • Esophagus divided into bulbs (correct)
  • Five or more esophageal glands
  • Absence of body annuli
  • Amphids behind or below the lips

Which of the following nematodes is known to cause elephantiasis, a neglected tropical disease?

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

What is the function of the copulatory bursa found in male Ancylostoma duodenale (Asian hookworm)?

<p>To inject the female counterpart with sperm during mating (C)</p> Signup and view all the answers

Which of the following statements about the life cycle of Enterobius vermicularis (Pinworm) is correct?

<p>Itching around the anus is a common symptom of infection (D)</p> Signup and view all the answers

What is the defining characteristic of eutely in nematodes?

<p>Organisms have a constant number of cells at maturity due to the cessation of mitosis in somatic cells. (A)</p> Signup and view all the answers

How do nematodes' muscles interact with their nerve cords, compared to other organisms?

<p>Nematodes' muscles reach out to the nerve cords, whereas in other organisms, the nerves innervate the muscles. (A)</p> Signup and view all the answers

What is the function of the amphids in nematodes?

<p>The amphids are chemo-sensory structures located at the anterior end of the nematode. (A)</p> Signup and view all the answers

What is the function of the phasmids in nematodes?

<p>The phasmids are chemoreceptors located in the posterior region of the nematode. (D)</p> Signup and view all the answers

What is the purpose of the cuticle in nematodes?

<p>The cuticle is a rigid, inelastic structure that is shed throughout the nematode's life. (A)</p> Signup and view all the answers

How does the nematode's body shape and musculature contribute to its locomotion?

<p>The nematode's tube-within-a-tube body plan and longitudinal muscles enable its characteristic to-and-fro motions. (A)</p> Signup and view all the answers

What is the function of the pseudocoel in nematodes?

<p>The pseudocoel is a fluid-filled cavity that acts as a hydrostatic skeleton, allowing the nematode to burrow. (C)</p> Signup and view all the answers

What is the significance of the different classifications of nematodes based on the number of muscle cells per quadrant?

<p>The muscle cell classification provides insight into the evolutionary history and adaptations of different nematode species, which have varying muscle cell arrangements. (C)</p> Signup and view all the answers

How do the different muscle cell classifications (platymyarian, coelomyarian, and circomyarian) in nematodes relate to their body shape and locomotion?

<p>Coelomyarian nematodes have a more flexible, U-shaped muscle structure that allows for more complex and graceful locomotion, compared to the simpler muscle arrangements of platymyarian and circomyarian nematodes. (A)</p> Signup and view all the answers

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