Phylum Sipuncula MCQs January 8, 2026September 28, 2024 by u930973931_answers 30 min Score: 0 Attempted: 0/30 Subscribe 1. Sipuncula are commonly known as: (A) Leeches (B) Earthworms (C) Ribbon worms (D) Peanut worms 2. Sipunculans primarily inhabit: (A) Freshwater environments (B) Marine environments (C) Terrestrial habitats (D) Brackish water 3. The body of a Sipunculan is divided into two main regions: the introvert and the: (A) Abdomen (B) Trunk (C) Prostomium (D) Segment 4. Which of the following is TRUE about Sipuncula? (A) They have a segmented body. (B) They possess a true coelom. (C) They are completely aquatic. (D) They have an exoskeleton. 5. The feeding mechanism of Sipuncula involves: (A) Gills (B) A radula (C) Cilia (D) Tentacles 6. Sipunculans primarily feed on: (A) Phytoplankton (B) Detritus (C) Larger invertebrates (D) Algae 7. The habitat of Sipuncula is primarily found in: (A) Rocky shores (B) Coral reefs (C) Sand and mud substrates (D) Open ocean 8. The Sipunculan nervous system is: (A) Highly developed (B) Only present in adults (C) Absent (D) Simple and decentralized 9. The reproductive strategy of Sipuncula is primarily: (A) Sexual (B) Asexual (C) Budding (D) Fragmentation 10. The larvae of Sipuncula are known as: (A) Trochophore larvae (B) Veliger larvae (C) Sipunculan larvae (D) Echinoderm larvae 11. Which of the following statements is TRUE about Sipuncula? (A) They have a well-defined head. (B) They are primarily freshwater animals. (C) They lack a segmented body. (D) They have complex respiratory structures. 12. Sipuncula belong to which larger taxonomic category? (A) Phylum Sipuncula (B) Phylum Mollusca (C) Phylum Annelida (D) Phylum Nematoda 13. The sipunculan’s body can retract into the trunk to avoid predators. This ability is known as: (A) Burrowing (B) Withdrawal (C) Contraction (D) Invagination 14. Which of the following is NOT a characteristic of Sipuncula? (A) Lack of segmentation (B) Presence of a coelom (C) Well-developed circulatory system (D) Presence of a radula 15. Sipunculans are primarily: (A) Detritivores (B) Carnivores (C) Herbivores (D) Omnivores 16. The coelom in Sipuncula is filled with: (A) Blood (B) Gel-like substance (C) Sea water (D) Body fluids 17. The main mode of locomotion in Sipuncula is: (A) Swimming (B) Burrowing (C) Crawling (D) Floating 18. Sipuncula have a body wall that consists of: (A) Two layers of muscles (B) A single layer of cells (C) Chitinous segments (D) A tough exoskeleton 19. In Sipuncula, respiration occurs primarily through: (A) Skin (B) Gills (C) Specialized respiratory organs (D) Pharyngeal slits 20. The life cycle of Sipuncula includes a larval stage that typically develops in: (A) Freshwater (B) Terrestrial habitats (C) Brackish water (D) Marine environments 21. Which of the following describes the body shape of most Sipuncula? (A) Spherical (B) Flat (C) Elongated (D) Cylindrical 22. Which of the following is a common genus of Sipuncula? (A) Lumbricus (B) Sipunculus (C) Nereis (D) Aplysia 23. The body cavity of Sipuncula is derived from: (A) Pseudocoelom (B) Enterocoely (C) Coelomate (D) Schizocoely 24. Which statement about Sipunculan reproduction is FALSE? (A) They can reproduce through fragmentation. (B) They are all hermaphroditic. (C) They can produce both eggs and sperm. (D) Most are dioecious. 25. Sipunculans are known for their ability to: (A) Change colors rapidly (B) Produce bioluminescence (C) Regenerate lost body parts (D) Live at extreme depths 26. Which of the following ecological roles do Sipuncula primarily serve? (A) Primary producers (B) Symbionts (C) Predators (D) Detritivores 27. Sipuncula exhibit which type of symmetry? (A) Bilateral symmetry (B) Radial symmetry (C) Asymmetry (D) None of the above 28. What is the main purpose of the introvert in Sipuncula? (A) Feeding (B) Locomotion (C) Respiration (D) Protection 29. Sipunculans are closely related to which group of animals? (A) Annelids (B) Mollusks (C) Echinoderms (D) Cnidarians 30. In Sipuncula, the anal opening is located at the: (A) Anterior end (B) Posterior end (C) Middle of the body (D) Ventral side Classes of Sipuncula Sipunculidea MCQs Siphunculida MCQs