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Vertebrates and Invertebrates

Platyhelminthes, Nemathelminthes and Annelida Practice Questions

20 free Platyhelminthes, Nemathelminthes and Annelida practice questions for the Zoology, each with the correct answer and a detailed explanation. Open any question below, or take the full set as an interactive quiz.

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All Platyhelminthes, Nemathelminthes and Annelida questions

20 questions
  1. Q1. Which specialized excretory cells are characteristic of Phylum Platyhelminthes and function primarily in osmoregulation?
  2. Q2. Annelids are characterized by 'metamerism.' What does this term refer to?
  3. Q3. Which type of body cavity is found in Nemathelminthes (Nematodes)?
  4. Q4. In the Annelid Hirudo medicinalis (Leech), how is the coelom modified?
  5. Q5. Flatworms are described as 'acoelomate' because:
  6. Q6. Which of the following describes the nervous system structure in most Annelids?
  7. Q7. Nematodes are known for 'eutely.' What does this biological phenomenon imply?
  8. Q8. The 'Chloragogen cells' found in the earthworm are functionally analogous to which vertebrate organ?
  9. Q9. What is the function of the 'Typhlosole' in the intestine of an earthworm?
  10. Q10. In Phylum Nematoda, which of the following is ABSENT in their anatomical structure?
  11. Q11. Which parasite belongs to Platyhelminthes and requires a snail as an intermediate host in its life cycle?
  12. Q12. Annelids utilize which respiratory pigment, often dissolved in the plasma rather than inside red blood cells?
  13. Q13. The 'Parapodia' found in Polychaetes (e.g., Nereis) serve which two primary functions?
  14. Q14. The body of a tapeworm (Cestoda) consists of a head and a series of segments. These are scientifically termed:
  15. Q15. Nematodes move in a 'thrashing' motion because their high-pressure fluid-filled cavity acts against which structure?
  16. Q16. Which structure in the Annelid Pheretima (Earthworm) is responsible for the secretion of the cocoon during reproduction?
  17. Q17. Ascaris lumbricoides shows sexual dimorphism. Which of the following is a characteristic of the male worm?
  18. Q18. Which of the following is a 'free-living' Platyhelminth?
  19. Q19. In Annelids, the excretory organs that open at both ends (one into the coelom and one to the exterior) are called:
  20. Q20. What is the primary mode of infection for the 'Hookworm' (Ancylostoma duodenale)?