Which feature is characteristic of nematode eggs compared with most cestode eggs?
Correct answer: A. They commonly have a single-cell embryo when passed
- A. They commonly have a single-cell embryo when passed
- B. They always contain a fully formed hexacanth embryo
- C. They are produced only inside arthropods
- D. They lack any protective outer covering
Explanation
Many nematode eggs are passed at an early stage and contain a single cell or developing embryo. Typical taeniid cestode eggs already contain a six-hooked oncosphere, making the second option a common classification trap.
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Covers protozoa, helminths and arthropods that infect domestic animals, including their morphology, life cycles, hosts, transmission and clinical effects. Questions connect parasite identification with diagnosis, prevention and treatment, and distinguish endoparasites from ectoparasites and definitive hosts from intermediate hosts.
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