Phylum Priapulida MCQs December 5, 2025September 28, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. Priapulida are commonly known as: (A) Horsehair worms (B) Penis worms (C) Ribbon worms (D) Roundworms 2. The body structure of Priapulida is primarily characterized by: (A) Segmentation (B) A rigid exoskeleton (C) Tentacles (D) A muscular proboscis 3. Priapulids are primarily found in which habitat? (A) Freshwater (B) Marine environments (C) Terrestrial (D) All of the above 4. The main function of the proboscis in Priapulida is to: (A) Absorb nutrients (B) Reproduce (C) Regulate water flow (D) Capture prey 5. Which of the following is a defining feature of Priapulida? (A) Jointed appendages (B) A closed circulatory system (C) A coelomate body structure (D) Lack of true segmentation 6. Priapulids are primarily: (A) Herbivores (B) Carnivores (C) Detritivores (D) Omnivores 7. The body of a Priapulid can be divided into which two main regions? (A) Proboscis and tail (B) Head and trunk (C) Anterior and posterior (D) Thorax and abdomen 8. Priapulids have a body covering made of: (A) Cuticle (B) Calcium carbonate (C) Chitin (D) Sclerotized plates 9. The larval stage of Priapulida is called: (A) Priapulus (B) Veliger (C) Nauplius (D) Trochophore 10. Which of the following statements about Priapulida is TRUE? (A) They have a complex nervous system (B) They lack a digestive system (C) They are a type of annelid (D) They exhibit bilateral symmetry 11. Which structure in Priapulida is primarily responsible for locomotion? (A) Proboscis (B) Body muscles (C) Coelom (D) Tentacles 12. Priapulida are known to inhabit: (A) Open ocean (B) Rocky shorelines (C) Sandy and muddy substrates (D) Coral reefs 13. Which of the following organisms are closely related to Priapulida? (A) Mollusks (B) Arthropods (C) Annelids (D) Echinoderms 14. The main reproductive strategy of Priapulida is: (A) External fertilization (B) Asexual reproduction (C) Internal fertilization (D) Budding 15. Priapulids primarily feed on: (A) Phytoplankton (B) Small invertebrates (C) Bacteria (D) Plant material 16. The term "Priapulida" is derived from: (A) Latin for "penis worm" (B) Latin for "pencil worm" (C) Greek for "priapus" (D) Greek for "water creature" 17. The cuticle of Priapulida serves which primary purpose? (A) Maintaining buoyancy (B) Absorption of nutrients (C) Regulation of gas exchange (D) Protection against predators 18. In terms of size, Priapulids are typically: (A) Microscopic (B) Small (a few centimeters) (C) Medium-sized (up to 20 cm) (D) Large (over 1 meter) 19. Which type of symmetry do Priapulida exhibit? (A) Bilateral symmetry (B) Radial symmetry (C) Asymmetry (D) None of the above 20. What is the primary role of Priapulida in their ecosystem? (A) Primary producers (B) Detritivores and predators (C) Parasitic organisms (D) Symbiotic organisms 21. The most recognized species of Priapulida is: (A) Priapulus caudatus (B) Priapulus fish (C) Priapulus longus (D) Priapulus aquaticus 22. Priapulids are classified under which phylum? (A) Mollusca (B) Annelida (C) Arthropoda (D) Priapulida 23. Which of the following is NOT a feature of Priapulida? (A) A coelom (B) A proboscis (C) True segmentation (D) A cuticle 24. The habitat of Priapulida mainly consists of: (A) Coral reefs (B) Subtidal sediments (C) Intertidal zones (D) Deep-sea trenches 25. Priapulids can be classified as: (A) Freshwater invertebrates (B) Marine invertebrates (C) Terrestrial organisms (D) Aquatic vertebrates 26. Which of the following is a significant threat to Priapulida populations? (A) All of the above (B) Overfishing (C) Climate change (D) Habitat destruction 27. What type of circulatory system do Priapulida possess? (A) Open circulatory system (B) Closed circulatory system (C) Lymphatic system (D) No circulatory system 28. The digestive system of Priapulida is classified as: (A) Absent (B) Incomplete (C) Complete (D) None of the above 29. In Priapulida, gas exchange primarily occurs through: (A) Gills (B) Skin (C) Respiratory structures (D) Mouth 30. The evolutionary significance of Priapulida lies in their: (A) All of the above (B) Primitive traits (C) Ecological role as predators (D) Unique body structure