Priapulids MCQs December 4, 2025September 30, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. What are Priapulids commonly known as? (A) Penis worms (B) Sea cucumbers (C) Horsehair worms (D) Ribbon worms 2. Which phylum do Priapulids belong to? (A) Mollusca (B) Priapulida (C) Arthropoda (D) Annelida 3. What is the typical habitat of Priapulids? (A) Freshwater environments (B) Terrestrial environments (C) High-altitude environments (D) Marine sediments 4. What feature is characteristic of Priapulids? (A) Tentacles (B) A segmented body (C) A hard exoskeleton (D) A tubular body 5. What is the primary feeding method of Priapulids? (A) Filter feeding (B) Herbivory (C) Predation (D) Scavenging 6. How do Priapulids reproduce? (A) Sexually with external fertilization (B) Asexually through budding (C) Sexually with internal fertilization (D) Fragmentation 7. What is the body structure of Priapulids primarily composed of? (A) Chitin (B) Calcium carbonate (C) Silica (D) Collagen and muscle 8. Which of the following best describes the nervous system of Priapulids? (A) Highly developed brain (B) Simple nerve net (C) Absent (D) Ladder-like nervous system 9. What is the ecological role of Priapulids in their environment? (A) Predators (B) Decomposers (C) Primary producers (D) Parasites 10. What unique structure do Priapulids possess that resembles a penis? (A) Operculum (B) Tentacle (C) Proboscis (D) Cloaca 11. How do Priapulids move through their environment? (A) By swimming (B) By floating (C) By crawling on surfaces (D) By burrowing 12. In which geological period did Priapulids first appear? (A) Cambrian (B) Jurassic (C) Silurian (D) Ordovician 13. Which of the following is a common characteristic of the Priapulid body plan? (A) A segmented body (B) A coelomate body structure (C) A hard outer shell (D) A tubular body with a distinct head 14. What do Priapulids primarily feed on? (A) Algae (B) Detritus (C) Plankton (D) Small invertebrates 15. How do Priapulids obtain oxygen? (A) Through gills (B) Through skin diffusion (C) Through a respiratory system (D) Through specialized lungs 16. What is the role of the cuticle in Priapulids? (A) Locomotion (B) Protection (C) Respiration (D) Digestion 17. What type of symmetry do Priapulids exhibit? (A) None of the above (B) Radial symmetry (C) Asymmetry (D) Bilateral symmetry 18. Which of the following statements about Priapulids is true? (A) They are only found in freshwater environments (B) They have been found in fossil records dating back over 500 million years (C) They have a complex brain structure (D) They are exclusively herbivorous 19. Which structure is responsible for the locomotion of Priapulids? (A) Cilia (B) Muscular contractions (C) Tentacles (D) Swimming appendages 20. What type of development do Priapulids undergo? (A) Direct development (B) Asexual reproduction (C) Indirect development with larval stages (D) Regeneration 21. Which of the following best describes the mouth of Priapulids? (A) Tentacled (B) Located at the anterior end (C) Circular and surrounded by appendages (D) Covered by a shell 22. What is the size range of most Priapulids? (A) 1–2 cm (B) 10–30 cm (C) 5–10 cm (D) 30–100 cm 23. How do Priapulids contribute to the benthic ecosystem? (A) By cycling nutrients (B) By filtering water (C) By predating on larger organisms (D) By producing organic matter 24. What is the primary composition of Priapulid body fluid? (A) Seawater (B) Saline solution (C) Blood (D) Hemolymph 25. In which regions are Priapulids most commonly found? (A) Tropical waters (B) Coastal marine environments (C) Polar regions (D) Deep-sea trenches 26. What type of reproduction is most common in Priapulids? (A) Sexual reproduction (B) Asexual budding (C) Parthenogenesis (D) Fragmentation 27. Which of the following is a characteristic of the Priapulid's proboscis? (A) It is used for locomotion (B) It contains sensory structures (C) It is retractable (D) It is hard and calcified 28. What type of body plan do Priapulids exhibit? (A) Radial (B) Asymmetrical (C) Bilateral (D) Segmented 29. How many species of Priapulids are currently known? (A) About 10 (B) About 30 (C) About 100 (D) Over 200 30. What is a significant feature of Priapulid larvae? (A) They are identical to adults (B) They are sessile (C) They live in freshwater (D) They have a different body shape