Phylum Nematoda MCQs January 8, 2026September 28, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. Nematoda is commonly known as what type of organism? (A) Flatworms (B) Cnidarians (C) Segmented worms (D) Roundworms 2. What type of body symmetry do nematodes exhibit? (A) Radial symmetry (B) Bilateral symmetry (C) Asymmetry (D) None of the above 3. Nematodes have which type of body cavity? (A) Acoelomate (B) Coelomate (C) Pseudocoelomate (D) None of the above 4. Which of the following is a characteristic of nematodes? (A) Segmented body (B) Soft, unsegmented body (C) Presence of a shell (D) Possession of parapodia 5. Nematodes possess a tough outer covering called: (A) Cuticle (B) Chitin (C) Shell (D) Tegument 6. Which of the following habitats do nematodes NOT typically inhabit? (A) Soil (B) Freshwater (C) Marine environments (D) Air 7. The feeding mode of most nematodes is: (A) Herbivorous (B) Carnivorous (C) Parasitic (D) All of the above 8. How do nematodes typically reproduce? (A) Asexually (B) Budding (C) Fragmentation (D) Sexually 9. Which nematode is well-known for causing disease in humans? (A) Ascaris lumbricoides (B) Both A and C (C) Trichinella spiralis (D) Caenorhabditis elegans 10. Nematodes possess a complete digestive system that includes: (A) Pharynx and gizzard (B) Stomach only (C) Mouth and anus (D) No digestive tract 11. Which of the following is NOT a common feature of nematodes? (A) Segmented body (B) Dorsal and ventral nerve cords (C) Cuticle (D) Pseudocoelom 12. The muscle fibers in nematodes are organized: (A) Circularly (B) In a spiral (C) Longitudinally (D) In a grid pattern 13. What is the primary role of nematodes in the ecosystem? (A) Decomposers (B) Predators (C) Parasites (D) All of the above 14. Which of the following nematodes is commonly used as a model organism in scientific research? (A) Trichinella spiralis (B) Caenorhabditis elegans (C) Ascaris lumbricoides (D) Enterobius vermicularis 15. Nematodes can be found in which of the following environments? (A) Aquatic (B) Terrestrial (C) Parasitic in other organisms (D) All of the above 16. The main reproductive structures in nematodes are called: (A) Testes and ovaries (B) Cloaca (C) Nephridia (D) Setae 17. Which of the following nematodes is responsible for pinworm infections in humans? (A) Ascaris lumbricoides (B) Enterobius vermicularis (C) Trichinella spiralis (D) Wuchereria bancrofti 18. What is the approximate length range for most nematodes? (A) Microscopic to a few centimeters (B) A few millimeters to several meters (C) One to ten centimeters (D) Ten to twenty centimeters 19. Nematodes are characterized by having: (A) A segmented body plan (B) A non-segmented body plan (C) A coelomic cavity (D) A dorsal nerve cord 20. The term “eutely” refers to: (A) The presence of segments in the body (B) The presence of a true coelom (C) The ability to regenerate lost body parts (D) Having a constant number of somatic cells 21. What is a common method of nematode locomotion? (A) Swimming (B) Gliding (C) Burrowing (D) Undulatory movements 22. Which nematode is known for its role in causing river blindness? (A) Wuchereria bancrofti (B) Strongyloides stercoralis (C) Ascaris lumbricoides (D) Onchocerca volvulus 23. Which part of the nematode’s body is specialized for sensory perception? (A) Pharynx (B) Cloaca (C) Cuticle (D) Amphids 24. Nematodes can be found in extreme environments, including: (A) Deep sea vents (B) All of the above (C) Hot springs (D) Arctic ice 25. Which of the following is a parasitic nematode that infects muscle tissue? (A) Wuchereria bancrofti (B) Trichinella spiralis (C) Caenorhabditis elegans (D) Enterobius vermicularis 26. Nematodes contribute to soil health primarily through: (A) All of the above (B) Organic matter decomposition (C) Pest control (D) Nutrient cycling 27. Which of the following structures do nematodes lack? (A) Digestive tract (B) Heart (C) Nervous system (D) Body wall 28. The cuticle of nematodes is primarily composed of: (A) Collagen (B) Chitin (C) Keratin (D) Protein 29. Which life cycle stage is absent in many free-living nematodes? (A) Egg (B) Pupa (C) Adult (D) Larva 30. The primary ecological role of nematodes in marine ecosystems is as: (A) Decomposers and nutrient recyclers (B) Primary producers (C) Predators of larger organisms (D) Symbionts