15 Questions
What is the defining characteristic that separates the class Secernentea (Phasmidia) from the class Adenophorea (Aphasmidia)?
The presence of phasmids
Which of the following statements about Trichuris trichiura (Whipworm) is incorrect?
It lives in the small intestine and feeds on blood
Which of the following characteristics is associated with the subclass Chromadoria?
Esophagus divided into bulbs
Which of the following nematodes is known to cause elephantiasis, a neglected tropical disease?
Wuchereria bancrofti
What is the function of the copulatory bursa found in male Ancylostoma duodenale (Asian hookworm)?
To inject the female counterpart with sperm during mating
Which of the following statements about the life cycle of Enterobius vermicularis (Pinworm) is correct?
Itching around the anus is a common symptom of infection
What is the defining characteristic of eutely in nematodes?
Organisms have a constant number of cells at maturity due to the cessation of mitosis in somatic cells.
How do nematodes' muscles interact with their nerve cords, compared to other organisms?
Nematodes' muscles reach out to the nerve cords, whereas in other organisms, the nerves innervate the muscles.
What is the function of the amphids in nematodes?
The amphids are chemo-sensory structures located at the anterior end of the nematode.
What is the function of the phasmids in nematodes?
The phasmids are chemoreceptors located in the posterior region of the nematode.
What is the purpose of the cuticle in nematodes?
The cuticle is a rigid, inelastic structure that is shed throughout the nematode's life.
How does the nematode's body shape and musculature contribute to its locomotion?
The nematode's tube-within-a-tube body plan and longitudinal muscles enable its characteristic to-and-fro motions.
What is the function of the pseudocoel in nematodes?
The pseudocoel is a fluid-filled cavity that acts as a hydrostatic skeleton, allowing the nematode to burrow.
What is the significance of the different classifications of nematodes based on the number of muscle cells per quadrant?
The muscle cell classification provides insight into the evolutionary history and adaptations of different nematode species, which have varying muscle cell arrangements.
How do the different muscle cell classifications (platymyarian, coelomyarian, and circomyarian) in nematodes relate to their body shape and locomotion?
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.
Explore the defining characteristics of Phylum Nematoda (Roundworms) such as eutely, growth by cell division, and unique muscle-nervous system connections. Understand the specific features that differentiate these organisms from others.
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